| 单词 | dacite |
| 例句 | Eichelberger, J. C. Origin of andesite and dacite: evidence of mixing at Glass Mountain in California and at other circum-Pacific volcanoes. A compositional tipping point governing the mobilization and eruption style of rhyolitic magma 2017-12-12T05:00:00Z Chunks of juvenile gray dacite fell like hail, some as large as golf balls. The Cataclysm: "I Was Just Instantly Buried" 2013-01-24T14:45:07.027Z Those gasses ripped and plucked existing rock from the debris avalanche and the ground, mixed that rock with the hot young dacite from the cryptodome, and hurled the whole mass along at incredible speeds. The Cataclysm: "That Whole Mountain Range Had Just Exploded" 2012-12-13T14:15:13.120Z Released from confining pressure, gasses within the thick dacite magma came out of solution and blew through upper slump block as it fell. The Cataclysm: "Vancouver! Vancouver! This Is It!" 2012-08-09T13:45:50.493Z In her case, thick, sticky dacite, a type of magma rather rich in silica, was making its laborious way up toward the surface. Prelude to a Catastrophe: "Something Dramatic" 2012-06-21T16:45:07.023Z Their felspar ranges from oligoclase to andesite and labradorite, and is often very zonal; sanidine occurs also in some dacites, and when abundant gives rise to rocks which form transitions to the rhyolites. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z "I wonder if they are visible from the dacite elevation on which SHE lives." Of All Things 2011-10-09T02:00:26.957Z Lava streams, especially when they consist of rhyolite, dacite and some kinds of andesite, may rapidly solidify, and then become exceedingly brittle. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4 "Bradford, William" to "Brequigny, Louis" The whole of this consists of tuffs and lavas, andesites prevailing in the west and rhyolites and dacites in the east. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" Quartz is sometimes present, and when this mineral becomes an essential it gives rise to a variety called quartz-andesite or dacite. Volcanoes: Past and Present In the hand specimen many of the hornblende and biotite dacites are grey or pale brown and yellow rocks with white felspars, and black crystals of biotite and hornblende. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z All this gossan and porphyry, and that copper stain up there–and just look at that dacite cap!” Silver and Gold A Story of Luck and Love in a Western Mining Camp |
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