| 单词 | gabbro |
| 例句 | At around 42 Ma, sea-floor pillow basalt and gabbro of the Crescent Terrane accreted to the southern margin of Vancouver Island and also to the adjacent part of Washington State. Physical Geology 2015-01-01T00:00:00Z These dark ferromagnesian minerals are commonly found in gabbro, basalt, diorite, and often form the black specks in granite. An Introduction to Geology 2017-01-01T00:00:00Z Not getting a sample of this gabbro was frustrating, but scientists are already extracting valuable lessons from the momentary failure. Crumbly Mars Rock, Not Hardware Flaws, Scuttled Perseverance's First Sample Attempt 2021-08-12T04:00:00Z The textbook explanation is that the Moho draws the line between the crust and the mantle: a demarcation between familiar igneous surface rocks - such as granites, basalts and gabbros - and those of the interior peridotites. Bid to drill deep inside Earth - BBC News 2015-11-30T05:00:00Z Unlike the basalt that makes up much of the Coast Range, which cooled quickly after erupting on the ocean floor, gabbro forms deep underground. Notes from the underground 2015-07-19T04:00:00Z Appreciable portions of the pit are gabbro, basalt that cooled underground without erupting, that is over 1,700 million years old. Oceans of Ore: How an Undersea Caldera Eruption Created Jerome, Arizona 2012-06-04T11:15:12.460Z These are caused either by old intrusions of diabase and gabbro which have undergone modifications, or by later ones of dolerite. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 6 "Groups, Theory of" to "Gwyniad" 2011-12-16T03:00:12.320Z Either way, it is lithologically distinct from that once waterlogged gabbro—and the team members are optimistic that, this time, they will acquire their all-important first sample. Crumbly Mars Rock, Not Hardware Flaws, Scuttled Perseverance's First Sample Attempt 2021-08-12T04:00:00Z Among the stones in the drift at these exposures are limestone, sandstone, quartzite, diabase, gabbro, gneiss, granite, schist, and porphyry, together with pieces of flint and chert. The Geography of the Region about Devils Lake and the Dalles of the Wisconsin 2011-11-29T03:00:17.347Z The gabbro found in this area rose up through the crust as molten magma, intruding through the older volcanic and sedimentary layers. Notes from the underground 2015-07-19T04:00:00Z The rocks of this group accompany gabbro and serpentine, but the exact conditions under which they are formed and the significance of their structures is not very clearly understood. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z Typical orbicular structure such as characterizes some granites and diorites is rare in the gabbros, though it has been observed in a few instances in Norway, California, &c. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z In retrospect, it is clearer now that the gabbro was never going to get along with the coring drill. Crumbly Mars Rock, Not Hardware Flaws, Scuttled Perseverance's First Sample Attempt 2021-08-12T04:00:00Z The serpentine and gabbro formation is characteristically of an eruptive nature. In the Andamans and Nicobars The Narrative of a Cruise in the Schooner "Terrapin" 2011-06-30T02:00:24.487Z Soon everyone was peering at Sollins’ newly collected sample, wrangling over crystalline structure and trying to decide if they were looking at basalt or gabbro. Notes from the underground 2015-07-19T04:00:00Z Their essential minerals are pyroxene, plagioclase and garnet: chemically they resemble the gabbros. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z In many gabbros there is a tendency to a centric arrangement of the minerals, the first crystallized forming nuclei around which the others grow. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z It will allow scientists to recover for the first time gabbros from the lower crust. Drillers propose deep-Earth quest 2011-03-24T09:37:04Z Five yards away, perhaps, a great mass of purple gabbro hung over a patch of nearly snowless moss. Marriage 2011-02-22T03:00:06.867Z These rocks are metamorphic, and though having a mineral constitution somewhat similar to that of diorite, they have been produced really from rocks of more basic character, such as diabase, dolerite and gabbro. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z The gabbro layer doesn’t even begin until the crust is about two miles thick. Busy Microbial World Discovered in Deepest Ocean Crust Ever Explored 2010-11-23T16:10:00Z Segregations of iron ores, such as ilmenite, usually with pyroxene or olivine, occur in association with some gabbro and anorthosite masses. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Anorthite is an essential constituent of many basic igneous rocks, such as gabbro and basalt, also of some meteoric stones. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The granite is not the oldest of the Cornish rocks; these are found in the Lizard peninsula and are represented by serpentine, gabbro and metamorphic schists. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 4 "Coquelin" to "Costume" Lithologically they are crystalline schists, together with granite, diorite, gabbro and other igneous rocks. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" It does not occur in distinct crystals with definite outlines, but only as lamellar masses in deep-seated igneous rocks, principally gabbro, of which it is an essential constituent. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" Still more common is the occurrence of sheared, foliated or schistose forms of gabbro. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Rocks vary considerably in the cementing properties of the dust, but usually the rocks classed as "trap," such as andesite, gabbro and rhyolite, and schist and basalt possess good cementing properties. American Rural Highways The magnetite crystals of these deposits interpenetrate with the other constituents of an igneous rock, commonly of a gabbro type, and the deposits themselves are essentially igneous rocks. The Economic Aspect of Geology These volcanic materials are pierced by serpentine, gabbro and granite. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" The rock which prevails in this region consists mainly of gabbro, which in the interior forms several isolated, black, plateau-formed hills, 100 to 150 metres high, between which an even, grassy, but treeless plain extends. The Voyage of the Vega round Asia and Europe, Volume I and Volume II Very often a mass of normal gabbro with typical igneous character passes at its margins or along localized zones into foliated rocks of this kind, and every transition can be found between the different types. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z To illustrate the operations, I will describe a specific case, viz. that of grinding the section of "gabbro"' above described, for microscopical purposes. On Laboratory Arts For statistical purposes, the United States Geological Survey has also included small quantities of diorite and gabbro. The Economic Aspect of Geology Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt. Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" The rock has probably been derived by dynamic metamorphism, from a coarse igneous rock like a gabbro. The Long Labrador Trail Rocks of the gabbro group, though perhaps not so common nor occurring in so great masses as granites, are exceedingly widespread. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z West Point proved to be an area of gabbro, a coarse-grained eruptive rock representative of basic rocks, while North Head was composed of basic agglomerate, and volcanic bombs were numerous. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 It may stop far below the surface and cool slowly, forming coarsely crystallized rocks of the granite and gabbro types. The Economic Aspect of Geology Under the resistless pressure of crustal movements almost any rocks, sandstones, shales, lavas of all kinds, granites, diorites, and gabbros may be metamorphosed into schists by crushing and shearing. The Elements of Geology The one exception is on Caribou Ridge, which is capped by a much altered gabbro. The Long Labrador Trail In this case it is clearly seen that the gabbros are the deep-seated and slowly crystallized representatives of the basalts which were poured out at the surfaces, and the dolerites which consolidated in fissures. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The mica in recent volcanic rocks, gabbros, and diorites is usually Biotite, while that so common in metamorphic limestones is usually, if not always, Phlogopite. The Student's Elements of Geology A few analyses of well-known gabbros are cited here. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The gneisses appear to be due in many cases to the crushing and shearing of deep-seated igneous rocks, such as granite and gabbro. The Elements of Geology The name was given originally in north Italy to certain coarsely crystalline dark green rocks, some of which are true gabbros, while others are serpentines. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z In Canada great portions of the eastern portion of the Dominion are formed of gabbros, norite, anorthosite and allied rock types. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Very fine-grained gabbros, on the other hand, have been distinguished as beerbachites. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z From an economic standpoint gabbros are not of great importance. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Chemically the gabbros are typical rocks of the basic subdivision and show the characters of that group in the clearest way. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z |
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