| 单词 | peridotite |
| 例句 | We know that to a depth of about a hundred miles the mantle consists predominantly of a type of rock known as peridotite, but what fills the space beyond is uncertain. A Short History of Nearly Everything 2003-05-06T00:00:00Z According to a Nature report, it seems not to be peridotite. A Short History of Nearly Everything 2003-05-06T00:00:00Z Drilling below the seabed in the mid–Atlantic Ocean, they have collected a core of rock more than 1 kilometer long, consisting largely of peridotite, a kind of upper mantle rock. At long last, ocean drillers exhume a bounty of rocks from Earth’s mantle 2023-05-25T04:00:00Z The upper mantle is typically composed of peridotite, a rock dominated by olivine and pyroxene. Physical Geology 2015-01-01T00:00:00Z These rocks are rare on the surface, but make up peridotite, the rock of the upper mantle. An Introduction to Geology 2017-01-01T00:00:00Z The mantle contains peridotite, a rock that reacts with the carbon in air and water to form marble and limestone. Scientists seek holy grail of climate change in Oman’s hills 2017-04-12T04:00:00Z 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 The only hiccup came when the recovered peridotite rocks contained veins of asbestos, prompting increased safety protocols. At long last, ocean drillers exhume a bounty of rocks from Earth’s mantle 2023-05-25T04:00:00Z They have low silica, much iron and magnesia, and the abundance of lime distinguishes them in a marked fashion from both the granites and the peridotites. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z When peridotite begins to melt, the silica- rich portions melt first due to their lower melting point. An Introduction to Geology 2017-01-01T00:00:00Z Emery is worked at several localities in the United States, especially near Chester, in Hampden county, Mass., where it is associated with peridotites. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In 1906 a number of small diamonds were discovered in an altered peridotite somewhat resembling the S. African blue ground, at Murfreesboro, Pike county, Arkansas. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" Large deposits of corundum exist in the United States, especially in N. Carolina and Georgia, where they are associated with peridotites, often near contact with gneiss. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 4 "Coquelin" to "Costume" In the form of isolated grains the mineral is a characteristic constituent of ultrabasic igneous rocks, namely the peridotites and the serpentines which have resulted from their alteration. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 3 "Chitral" to "Cincinnati" Ultramafic mantle rock, consisting largely of peridotite, partially melts and generates magma that is basaltic. An Introduction to Geology 2017-01-01T00:00:00Z In North Carolina and Georgia, the corundum occurs in vein-like bodies at the contact of peridotite with gneisses and schists, and also in part in the peridotite itself. The Economic Aspect of Geology In Georgia the asbestos, which is anthophyllite, occurs in lenticular masses in peridotite associated with gneiss. The Economic Aspect of Geology Small diamonds have been found in peridotite masses in Pike County, Arkansas, but these are of very little commercial value. The Economic Aspect of Geology In this locality the original rock is a peridotite, relatively low in nickel, which has been altered to serpentine. The Economic Aspect of Geology The original rock was a highly magnesian igneous rock of the peridotite type, which is very unstable under weathering conditions, and rapidly alters to serpentine. The Economic Aspect of Geology Chromite is a common minor constituent of basic igneous rocks of the peridotite and pyroxenite type. The Economic Aspect of Geology Asbestos deposits occur chiefly as veinlets in serpentine rock, which is itself the alteration of some earlier rock like peridotite. The Economic Aspect of Geology In the United States small quantities of platinum are recovered from the gold-bearing gravels of California and Oregon, where the streams have come from areas of serpentine and peridotite. The Economic Aspect of Geology It was originally peridotite, occurring in necks or plugs of old volcanoes penetrating carbonaceous sediments. The Economic Aspect of Geology In general the principal gem minerals, except pearl and turquoise, occur as original constituents in igneous intrusives, usually of a pegmatite or peridotite nature. The Economic Aspect of Geology The original home of platinum is in basic igneous rocks, such as peridotites, pyroxenites, and dunites, where it has been found in small, scattered crystals intergrown with olivine, pyroxene, and chromite. The Economic Aspect of Geology |
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