| 单词 | metamorphic rock |
| 例句 | Slate is a metamorphic rock consisting of numerous minerals. Restoring the color to slate that’s lost its blackness 2019-09-13T04:00:00Z But the winner was a team of UW graduate students from the Earth and Space Sciences Department with the name "We're Kinda the Schist," named after metamorphic rock. Burke Museum seeks trivia geeks 2011-04-06T20:52:03Z Thus, after the Capitol was burned during the War of 1812, reconstruction made use of marble — a harder, metamorphic rock found on the upper Potomac. Hiking along Virginia’s Aquia Creek and finding history a stone’s throw from home 2021-04-01T04:00:00Z Then: heat from the interior, metamorphic rock, clouds of steam hiding the sun; clouds, torrential rains, ocean basins filling, rivers, mountains, streams, sand, gravel, clay, sedimentary rock. “Life Story,” Virginia Lee Burton’s Picture Book for the Ages 2015-10-08T04:00:00Z It’s a metamorphic rock called schist, compressed by mountains thought to have once been as tall as the Himalayas. Four destinations that feel like geologic theme parks 2021-10-14T04:00:00Z It’s a metamorphic rock, which means it becomes something new under extreme heat and pressure without melting. Earth is a geological oddball in our solar system. This is why. 2023-10-12T04:00:00Z Describe the differences among primitive, igneous, sedimentary, and metamorphic rock, and relate these differences to their origins. Astronomy 2016-10-13T00:00:00Z The person with knowledge of the matter said that the group’s name derived from the metamorphic rock, signaling the group’s intent to be enduring and maintain a clarity of purpose. An Unusual $1.6 Billion Donation Bolsters Conservatives 2022-08-22T04:00:00Z Equipment designed for the softer, cooler sedimentary rock often found in oil fields falters in the extremes of hot, hard metamorphic rocks such as granite. In Utah, researchers are trying to unlock Earth’s heat and make geothermal energy a reality 2022-07-13T04:00:00Z The rock failed along weakened foliation planes of the metamorphic rock on Johnson Peak, in an area that had been eroded into a steep slope by glacial ice. Physical Geology 2015-01-01T00:00:00Z But on other worlds, it’s more typical to find metamorphic rocks forged in the split-second shock of a meteoroid impact. Earth is a geological oddball in our solar system. This is why. 2023-10-12T04:00:00Z Foliated textures come from platy minerals forming planes in a rock, while non-foliated metamorphic rocks have no internal fabric. An Introduction to Geology 2017-01-01T00:00:00Z Marble, the metamorphic rock, embodied for me a dark paradox: It is change that produces changelessness. When I Went Away From the World 2022-04-19T04:00:00Z He wraps a hard hand around her thigh, and at that point of contact Bernini has made metamorphic rock soft, impossibly. Contemplating Beauty in a Disabled Body 2022-03-29T04:00:00Z Igneous or metamorphic rocks have the lowest primary porosity because they commonly form at depth and have interlocking crystals. Physical Geology 2015-01-01T00:00:00Z Schist, a hard metamorphic rock, lies closer to the Earth’s surface in those two places and supports the skyscrapers’ great tonnage. Review | For the human race, geology is destiny 2019-05-31T04:00:00Z Thumbnail: Folded foliation in a metamorphic rock from near Geirangerfjord, Norway. An Introduction to Geology 2017-01-01T00:00:00Z The dark, blocky cylinder appears to comprise a roughly fifty–fifty mix of ice and a metamorphic rock called gneiss, Talalay says. Chinese crew extract first rock from beneath East Antarctic ice in 60 years 2019-03-04T05:00:00Z It's not uncommon to find round, deep red garnet crystals embedded like pomegranate seeds in metamorphic rocks. The Astonishing Origin of Garnets in Rhyolite 2019-02-03T05:00:00Z In most cases, this is sedimentary or igneous rock, but metamorphic rock that reaches the surface and is then reburied can also be considered a parent rock. Physical Geology 2015-01-01T00:00:00Z The rock is about as old as the oldest rocks found on Earth—metamorphic rocks from Canada and Greenland. Ancient Earth rock found on the moon 2019-01-29T05:00:00Z In a manner like the Gros Ventre slide, foliation planes of weakness in metamorphic rock outcrops were parallel with the surface, compromising shear strength. An Introduction to Geology 2017-01-01T00:00:00Z One idea is that when igneous or metamorphic rocks are under stress, their molecular bonds break and release ionized oxygen that travels through the rock. What caused the mysterious lights in the night sky after Mexico’s earthquake? 2017-09-15T04:00:00Z Westall said it remains possible that the haematite structures were formed as a result of the high temperatures and pressures experienced by metamorphic rocks. World's oldest fossils found in Canada, say scientists 2017-03-01T05:00:00Z Foliation is a key feature of metamorphic rocks formed under directed pressure; foliated metamorphic rocks include slate, phyllite, schist, and gneiss. Physical Geology 2015-01-01T00:00:00Z Beneath it was mostly schist, metamorphic rock that Mount described as weathered and fractured. Government severely misjudged strength of Oroville emergency spillway, sparking a crisis 2017-02-19T05:00:00Z The metamorphic rock, amphibolite, is primarily composed of amphibole minerals. An Introduction to Geology 2017-01-01T00:00:00Z One example might be warm, wet plains, on metamorphic rock, with mostly deciduous forest. 3D ocean map tracks ecosystems in unprecedented detail 2017-01-02T05:00:00Z On Earth, tridymite generally forms at high temperatures in volcanic or metamorphic rocks, not a finely layered sedimentary rock like Buckskin. Mars Rover Finds Changing Rocks, Surprising Scientists 2015-12-17T05:00:00Z How do variations in the geothermal gradient affect the depth at which different metamorphic rocks form? Physical Geology 2015-01-01T00:00:00Z Rises of metamorphic rock and shale pounded smooth by Indian moccasins long ago, glisten, undulate as the back of a whale, while the Bronx River thunders, cascades or eases silken over silt. Forest Walk at the Botanical Garden 2015-09-09T04:00:00Z Mica minerals are usually found in igneous and metamorphic rocks, while clay minerals are more often found in sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z The Manhattan Schist Formation is the best known of the local metamorphic rock formations, and is visible in the outcroppings in Central Park. Decade of Tunnel Excavations Brings Geologists Blessings From Below 2014-02-18T01:35:17Z Also in Ethiopia gold is associated with the proterozoic metamorphic rocks, found to the west of the Afar lowlands, where recent volcanic rocks mark the Great Rift System of the African plate. In Search of the Lost Land of Gold (and mummified baboons too) 2013-08-30T21:45:04.883Z Two things that a geologist first considers when looking at a metamorphic rock are what the parent rock might have been, and what type of metamorphism has taken place. Physical Geology 2015-01-01T00:00:00Z When the bit of metamorphic rock that would become Florida’s basement rifted off of proto-Africa in the time of Pangea, a basin formed as the baby Atlantic Ocean was born. Living (and Sometimes Dying) with Karst 2013-03-07T14:15:07.193Z Other sheet silicates include serpentine and chlorite, found in metamorphic rocks. An Introduction to Geology 2017-01-01T00:00:00Z You’ll find sapphires in some volcanic fields, and in metamorphic rocks like gneiss, mica schist and sometimes marble. The Real Heart of the Ocean 2012-04-14T14:45:05.383Z The second is the zone of the snowy peaks and of the lower Himalaya, and is composed chiefly of crystalline and metamorphic rocks together with unfossiliferous sedimentary beds supposed to be of Palaeozoic age. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4 "Hero" to "Hindu Chronology" 2012-04-04T02:00:56.447Z The processes related to metamorphic rocks are at the bottom of the cycle. Physical Geology 2015-01-01T00:00:00Z DALRADIAN, in geology, a series of metamorphic rocks, typically developed in the high ground which lies E. and S. of the Great Glen of Scotland. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 9 "Dagupan" to "David" 2012-02-11T03:03:39.807Z Aluminum concentrates in soils as feldspar and ferromagnesian minerals in igneous and metamorphic rocks undergo chemical weathering processes. An Introduction to Geology 2017-01-01T00:00:00Z He explained that the outcrop was made of metamorphic rock that was formed 15 to 20 miles beneath the earth’s surface. City Room: Colliding Continents Created the Rock Formation in a Children's Playground 2012-02-05T19:30:17Z The Potsdam or any other sandstone formation might be converted into quartzite by the same process, and it would then be a metamorphic rock. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z Second, it has implications for the texture of metamorphic rocks. Physical Geology 2015-01-01T00:00:00Z The central plateau consists almost entirely of metamorphic rocks with extensive tracts of granite in Unyamwezi. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7 "Geoponici" to "Germany" 2011-09-26T02:00:25.313Z In metamorphic rocks, facies are groups of minerals called mineral assemblages. An Introduction to Geology 2017-01-01T00:00:00Z Mr. Distenfeld, 48, is a sculptor who prefers granite gneiss -– the banded metamorphic rock found beneath swaths of New York City -– and in the Nostrand pit he saw a boulder of it. City Room: With Big, Heavy Rocks, a Man Turns a Nuissance Into a Niche 2011-08-14T21:58:35Z After lunch they conjugate “aburrir” or memorize the differences between igneous, sedimentary and metamorphic rock. To students, it?s all about the (boring) content 2011-08-14T15:47:26Z In order to use the K-Ar dating technique, we need to have an igneous or metamorphic rock that includes a potassium-bearing mineral. Physical Geology 2015-01-01T00:00:00Z The richest iron ores of North America are of this nature, and will be referred to below in connection with other substances of economic importance contained in the metamorphic rocks. North America 2011-05-05T02:00:20.027Z This is useful when interpreting the history of metamorphic rock. An Introduction to Geology 2017-01-01T00:00:00Z There are a number of other metamorphic rocks, but those mentioned are the most commonly occurring species. Geology 2011-02-20T03:00:12.660Z Here are strata deposited by the miocene tertiary; here are breakings forth of metamorphic rocks of many periods; here are the complex results of diverse influences and forces. The Westerners 2011-02-14T03:00:39.347Z When radiometric techniques are applied to metamorphic rocks, the results normally tell us the date of metamorphism, not the date when the parent rock formed. Physical Geology 2015-01-01T00:00:00Z Segregated and fissure veins occur in either igneous, sedimentary, or metamorphic terranes, but are more commonly of economic importance in the metamorphic rocks than elsewhere, and will be referred to again in that connection. North America 2011-05-05T02:00:20.027Z As with all metamorphic rock, the parent rock texture and chemistry are major factors in determining the final outcome of the metamorphic process, including what index minerals are present. An Introduction to Geology 2017-01-01T00:00:00Z What is the general character of metamorphic rocks? Geology 2011-02-20T03:00:12.660Z It is aptly named, with kilometer-scale folds of Precambrian metamorphic rocks. Scientist at Work: Answering Questions About Antarctica 2011-01-22T16:00:18Z Of the consolidated rocks, well-fractured volcanic rocks and limestone that has cavernous openings produced by dissolution have the highest potential porosity, while intrusive igneous and metamorphic rocks, which formed under great pressure, have the lowest. Physical Geology 2015-01-01T00:00:00Z A very large proportion of both the quartz and placer mining of North America is in regions occupied by metamorphic rock. North America 2011-05-05T02:00:20.027Z Two frequently found micas are dark-colored biotite, frequently found in granite, and light-colored muscovite, found in the metamorphic rock called schist. An Introduction to Geology 2017-01-01T00:00:00Z What are metamorphic rocks, and what is their general appearance? Geology 2011-02-20T03:00:12.660Z Happily, we collected a variety of igneous and metamorphic rocks that will help fill in the hole left by several other unproductive sites. Scientist at Work: Rocks, Zircon Zapping and a Big Shrimp 2011-01-07T21:02:35Z Fractured igneous and metamorphic rocks, and especially fractured volcanic rocks, can be highly permeable, as can limestone that has been dissolved along fractures and bedding planes to create solutional openings. Physical Geology 2015-01-01T00:00:00Z It is in metamorphic rocks that the geologist looks for gems, the precious metals, crystalline marble, magnetic iron, etc. North America 2011-05-05T02:00:20.027Z They are usually found in igneous rocks, such as granite, rhyolite, and basalt as well as metamorphic rocks and detrital sedimentary rocks. An Introduction to Geology 2017-01-01T00:00:00Z Syenite, like granite, is recognised as an igneous as well as a metamorphic rock. Geology 2011-02-20T03:00:12.660Z Near faster ice streams, like Byrd Glacier, we found a rich assortment of igneous and metamorphic rocks, probably eroded from the upstream craton, even though the local nunatak geology exposes only Beacon and Ferrar. Scientist at Work: Rocks, Zircon Zapping and a Big Shrimp 2011-01-07T21:02:35Z An aquitard is a body that does not allow transmission of a significant amount of water, such as a clay, a till, or a poorly fractured igneous or metamorphic rock. Physical Geology 2015-01-01T00:00:00Z So intimate is the association of gold with metamorphic rocks that this is one of the main guides in searching for it, although, as already stated, it is frequently present in other rocks as well. North America 2011-05-05T02:00:20.027Z The primary way metamorphic rocks are identified is with texture. An Introduction to Geology 2017-01-01T00:00:00Z Frequently, it is quite impossible to say what was the original condition of some metamorphic rocks; often, however, this is sufficiently obvious. Geology 2011-02-20T03:00:12.660Z From moraine sites near the Miller Range, we sampled an abundance of igneous and high-grade metamorphic rocks, not unlike those found locally in the Nimrod Group. Scientist at Work: Unraveling the History Beneath the Ice 2010-12-28T21:28:12Z One is garnet, which is common in some metamorphic rocks and typically displays the dodecahedral shape. Physical Geology 2015-01-01T00:00:00Z While this scheme of classification is based on the succession of sedimentary beds, igneous and metamorphic rocks have a place in it, providing their age can be determined. North America 2011-05-05T02:00:20.027Z The rock cycle shows that both igneous and sedimentary rocks can become metamorphic rocks. An Introduction to Geology 2017-01-01T00:00:00Z Granite is recognised as an igneous as well as a metamorphic rock. Geology 2011-02-20T03:00:12.660Z The best one, he said, brought kids to the whiteboard, where they used their fingers to sort words describing metamorphic rocks, as a video played to the side. Some educators question if whiteboards, other high-tech tools raise achievement 2010-06-11T04:00:00Z What are the processes that lead to the formation of a metamorphic rock? Physical Geology 2015-01-01T00:00:00Z With placer gold, and probably derived largely, if not entirely, from metamorphic rocks, there are frequently found grains of platinum. North America 2011-05-05T02:00:20.027Z The pressure that affects metamorphic rocks can be grouped into confining pressure and directed stress. An Introduction to Geology 2017-01-01T00:00:00Z Consisting of red sandstones, mudstones and conglomerates, they are inclined at high angles usually away from the granite massif and the encircling metamorphic rocks. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 6 "Armour Plates" to "Arundel, Earls of" The metamorphic rocks are associated with bands of epidiorite which have shared in the folding and metamorphism of the region. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 5 "Arculf" to "Armour, Philip" Most metamorphic rocks are formed at depths of kilometres to tens of kilometres. Physical Geology 2015-01-01T00:00:00Z More than this, the foliation frequently so characteristic of metamorphic rocks is considered as evidence of a flowing movement or shearing of the material while under pressure. North America 2011-05-05T02:00:20.027Z Slate is a fine-grained metamorphic rock that exhibits a foliation called slaty cleavage that is the flat orientation of the small platy crystals of mica and chlorite forming perpendicular to the direction of stress. An Introduction to Geology 2017-01-01T00:00:00Z The mountain ranges of the east of Brazil, from Cape St Roque to the mouth of the river Plate, are composed chiefly of crystalline and metamorphic rocks. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" To metamorphose is to change; and metamorphic rocks are those which have been changed by heat or pressure from their original formation. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. As already noted, the nature of the parent rock controls the types of metamorphic rocks that can form from it under differing metamorphic conditions. Physical Geology 2015-01-01T00:00:00Z Common examples of metamorphic rocks are mica, schist, gneiss, 324 statuary marble, certain granites, etc. North America 2011-05-05T02:00:20.027Z Non-foliated metamorphic rocks are typically composed of just one mineral and, therefore, usually show the effects of metamorphism with recrystallization in which crystals grow together, but with no preferred direction. An Introduction to Geology 2017-01-01T00:00:00Z Some of the metamorphic rocks may belong to the older Palaeozoic period, but the greater part of the series is probably Archaean. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" The metamorphic rocks were primarily igneous and are changed somewhat in their structure by the lapse of time. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. Some examples of non-foliated metamorphic rocks are marble, quartzite, and hornfels. Physical Geology 2015-01-01T00:00:00Z No satisfactory boundary between these hills of gneiss, schist, and allied metamorphic rocks, and the others of the same general character in the neighbouring portions of New York and New Jersey, has been determined. North America 2011-05-05T02:00:20.027Z Along this route, the degree of metamorphism gradually increases from sedimentary parent rock to low-grade metamorphic rock, then higher-grade metamorphic rock, and eventually the igneous core. An Introduction to Geology 2017-01-01T00:00:00Z The term, which includes both the plutonic and metamorphic rocks, is substituted for primary, because some members of both these classes, such as granite and gneiss, are posterior to many secondary or fossiliferous rocks. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology The igneous rocks, then, are the lowest of all; then come the metamorphic rocks; and as before stated, on top of metamorphic rock begins the first evidence of life in its lowest form. Nature's Miracles, Volume 1 Familiar Talks on Science—World-Building and Life. Earth, Air and Water. The metamorphic rocks formed from mudrock under regional metamorphosis with a typical geothermal gradient are listed. Physical Geology 2015-01-01T00:00:00Z Most of the coast of Norway is composed of metamorphic rock; but these islands are of granite, and for marvellous peaks and oddly-pointed shapes, deep, far-reaching gulches and ca�ons, are unequalled elsewhere. Due North or Glimpses of Scandinavia and Russia In the lowest parts of the Grand Canyon are the oldest sedimentary formations, with igneous and metamorphic rocks at the bottom. An Introduction to Geology 2017-01-01T00:00:00Z Diopside is the characteristic pyroxene of metamorphic rocks, occurring especially in crystalline limestones, and often in association with garnet and epidote. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" Wherever the heated material came into contact with aqueous rocks it transformed them, for a foot or more, into crystalline, metamorphic rocks. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place Some common minerals in metamorphic rocks are shown in Figure 7.21, arranged in order of the temperature ranges within which they tend to be stable. Physical Geology 2015-01-01T00:00:00Z Mountains of the Secondary Age were often made of Primary sedimentary rocks, or of Primary igneous rocks, so much changed that geologists call them metamorphic rocks. The Boy With the U.S. Miners A nonconformity occurs when sedimentary rock is deposited on top of igneous and metamorphic rocks as is the case with the contact between the strata and basement rocks at the bottom of the Grand Canyon. An Introduction to Geology 2017-01-01T00:00:00Z Occasionally diorites have a parallel banded or foliated structure, but these must not be confounded with the epidiorites, which are metamorphic rocks and also have a conspicuous foliation. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" As bricks vary in colour and quality according to the materials that compose them, so the metamorphic rocks differ. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place When mountains erode, those metamorphic rocks are uplifted by crustal rebound. Physical Geology 2015-01-01T00:00:00Z In the older rocks, basalt has often undergone decomposition into melaphyre; and amongst the metamorphic rocks it has been changed into diorite or hornblende rock; the augite having been converted into hornblende. Volcanoes: Past and Present Modern researches have shown, too, that these metamorphic rocks are not, as was once supposed, all of the same age. Essays: Scientific, Political, & Speculative, Vol. I It occurs as veins or lodes in metamorphic rocks, and it is this form of its presence in Australia, associated with gold, that has made the word of such daily occurrence. Austral English A dictionary of Australasian words, phrases and usages with those aboriginal-Australian and Maori words which have become incorporated in the language, and the commoner scientific words that have had their origin in Australasia If mica is a prominent element, the metamorphic rock is easily parted into overlapping, scaly layers. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place Some geologists confine the term metamorphism to the changes involved in contact and dynamic metamorphism, and call the resulting products metamorphic rocks. The Economic Aspect of Geology Resting unconformably on these metamorphic rocks, Old Red sandstone strata are met with in a few places. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Anthracite coal occurs in folded and metamorphic rocks. Commercial Geography A Book for High Schools, Commercial Courses, and Business Colleges Of the variety of problems that it presents one might mention the petrological questions connected with the intrusion of the great masses of granite, and their relation to the slates and associated metamorphic rocks. The Panjab, North-West Frontier Province, and Kashmir The most enduring of all the rocks are the foundation granite, and the metamorphic rocks that lie next to them. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place The tract lying to the north-west of this dislocation is composed of the metamorphic rocks of the Eastern Highlands. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" To the geologist the fossiliferous limestones and the metamorphic rocks are alike of interest. The Sunny Side of Ireland How to see it by the Great Southern and Western Railway Made from a very fine, hard metamorphic rock, small enough to be classed as a hatchet; crescent-shaped at the top. Illustrated Catalogue Of The Collections Obtained From The Indians Of New Mexico And Arizona In 1879 Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 307-428 Stone hatchets rather well formed with blunt poll, distinct annular groove, and tapering blade; chiefly of basalt, three of metamorphic rock. 681-682. Illustrated Catalogue of the Collections Obtained from the Indians of New Mexico in 1880 Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-81, Government Printing Office, Washington, 1883, pages 429-466 These are the beds, sometimes miles in depth, called metamorphic rocks, formed by water, then transformed by heat. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place In the metamorphic rocks no organic remains have been found, and they are geologically below all the rocks that do contain traces of animal life. An Expository Outline of the "Vestiges of the Natural History of Creation" With a Notice of the Author's "Explanations:" A Sequel to the Vestiges It is called Chihoka. 18th May, 1866.—At our crossing place metamorphic rocks of a chocolate colour stood on edge; and in the country round we have patches of dolomite, sometimes as white as marble. The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume I (of 2), 1866-1868 There is also a class of rocks, called metamorphic rocks, including some kinds of marble. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky Nowhere are the evidences of this denudation more apparent than in North and South America, where granitic or metamorphic rocks cover an area hardly less than that of all Europe. Darwinism (1889) From aqueous rock materials, fire has produced a metamorphic rock. Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place The so-called "primitive gneiss" of Norway appears to belong to the Laurentian, and the Page 67 ancient metamorphic rocks of Bohemia and Bavaria may be regarded as being approximately of the same age. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science There is no igneous, no metamorphic rock here; nothing but limestone of the Jurassic formation. Wanderings by southern waters, eastern Aquitaine Archaean.—The metamorphic rocks compose the main mass of the tableland, and are exposed in every deep valley in Tigre and along the valley of the Blue Nile. The Project Gutenberg Encyclopedia Volume 1 of 28 Veins of auriferous quartz are found throughout the central chain, the richest lodes being encountered in metamorphic rocks near crystalline formations. Santo Domingo A Country with a Future Where metamorphic rocks are found, the surface is broken and hilly, rising to elevations of 600 feet or more above the lake; in this respect unlike the southern shore, which is low and flat. By Water to the Columbian Exposition The diamond is found in the débris of metamorphic rocks in many countries, and is probably one of the evolved products of the distillation of organic matter they once contained. Scientific American Supplement, No. 362, December 9, 1882 Beyond, the metamorphic rock gave place to red sandstone, and the ground sloped down into the little coal basin of Firmi. Wanderings by southern waters, eastern Aquitaine The metamorphic rocks have been invaded by igneous materials, some before, and by far the larger series after the folding of the strata. The Project Gutenberg Encyclopedia Volume 1 of 28 The table, with its igneous crystallizations, lies upon the metamorphic rock. Two Summers in Guyenne They are the same in material, but only changed into new forms and combinations; hence they have been called by Mr. Lyell, metamorphic rocks. Vestiges of the Natural History of Creation This glacial drift reposes near the mountains on ancient metamorphic rocks and farther from them on marine Pliocene strata. The Antiquity of Man How do the Triassic sandstones and shales compare in hardness with the igneous and metamorphic rocks about them? The Elements of Geology A considerable lapse of time must intervene between the formation of Plutonic and metamorphic rocks in the nether regions and their emergence at the surface. The Student's Elements of Geology I have also seen it in thin veins of metamorphic rocks, glittering like silver, and when scratched with a knife, it resolves into a downy condition like scraped cotton. Cyprus, as I Saw It in 1879 Here, also, a new appearance was presented in some extensive and level banks of alluvium or detritus of the neighbouring metamorphic rocks; but I neglected to observe whether it was stratified or not. Geological Observations on South America These pseudo-fragments of shale will perhaps explain, in some cases, the origin of apparently extraneous fragments in crystalline metamorphic rocks. Volcanic Islands The Lower and the Upper Huronian consist in the main of old sea muds and sands and limy oozes now changed to gneisses, schists, marbles, quartzites, slates, and other metamorphic rocks. The Elements of Geology To this subject, however, I shall again revert, in Chapter 35, where the chronological relations of the metamorphic rocks are pointed out. The Student's Elements of Geology These are nearly eleven inches in diameter, while in the fort of Kyrenia the stone shot are still existing, nineteen inches in diameter, composed of an exceedingly hard and heavy metamorphic rock. Cyprus, as I Saw It in 1879 This island lies between the Chonos and Chiloe groups: it is about eight hundred feet high, and perhaps has a nucleus of metamorphic rocks. Geological Observations on South America This is a process which is now fully recognised as having been a potent factor in the production of the metamorphic rock, and has been called by more recent writers "dynamo-metamorphism." Volcanic Islands In many cases, however, the early history of a metamorphic rock can be deciphered. The Elements of Geology Age of metamorphic rocks. — of Plutonic rocks. — of strata, tests of. — of volcanic rocks. The Student's Elements of Geology So again the making out of cleavage and the foliation of the metamorphic rocks. Life and Letters of Charles Darwin — Volume 2 For more than two hundred miles northward of Navidad, the coast consists of plutonic and metamorphic rocks, with the exception of some quite insignificant superficial beds of recent origin. Geological Observations on South America It is also supported by such facts as the small mean density of the earth, the increasing temperature at increasing depths, the phenomena of volcanoes and injected veins, and those of igneous and metamorphic rocks. History of the Conflict Between Religion and Science These few examples must suffice of the great class of metamorphic rocks. The Elements of Geology The metamorphic rocks are not indicated in this diagram: but the student will infer, from what is said in Chapters 31 and 33, that some portions of the stratified formations, Nos. The Student's Elements of Geology On this Laurentian gneiss, in parts of the western Highlands, the Lower Cambrian and various metamorphic rocks rest unconformably. The Student's Elements of Geology It rests, wherever any underlying formation can be seen, on plutonic and metamorphic rocks. Geological Observations on South America Lime, scarcity of, in metamorphic rocks. — in solution, source of. The Student's Elements of Geology Cleavage explained. —, crystalline theory of. —, mechanical theory of. — of metamorphic rocks. The Student's Elements of Geology Stratification, diagonal or cross. —, different forms described. — of metamorphic rocks considered. The Student's Elements of Geology To this subject I shall refer again when treating of the metamorphic rocks, and of the slaty and jointed structure. The Student's Elements of Geology |
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