Video: Dab tsi yog cov yam ntxwv ntawm andesitic magma?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev tawg tsis tawg yog nyiam los ntawm cov ntsiab lus roj tsawg thiab cov viscosity magmas (basaltic rau andesitic magmas). Yog tias qhov viscosity tsawg, qhov tawg tsis tawg feem ntau pib nrog cov qhov hluav taws kub vim yog tso tawm cov pa yaj. Thaum magma nce mus txog saum npoo ntawm lub ntiaj teb , nws hu ua lava.
Ib yam li ntawd, tib neeg nug, dab tsi yog andesitic magma?
Andesitic magma feem ntau yog tsim los ntawm stratovolcanoes. Nws yog ib hom ntawm magma uas hardens sai sai thaum nws mus txog saum npoo.
Dab tsi ntawm lub roob hluav taws muaj andesitic magma? Shield volcanoes yog tsim los ntawm basaltic magma, feem ntau saum lub mantle plume, whereas lub stratovolcanoes (qee zaum hu ua volcanoes sib xyaw ) yog tsim los ntawm andesitic/ mob rhyolitic magma. Koj kuj tseem yuav nkag siab txog kev sib raug zoo ntawm volcanic phenomena thiab phaj tectonics.
Ua li no, dab tsi yog yam ntxwv ntawm magma?
Magma ( Yam ntxwv , Hom, Qhov Chaw, thiab Evolution) A magma muaj feem ntau ntawm cov kua pob zeb teeb meem, tab sis tej zaum yuav muaj cov muaju ntawm ntau yam minerals, thiab tej zaum yuav muaj ib tug roj theem uas yuav yaj nyob rau hauv cov kua los yog tej zaum yuav muaj raws li ib tug cais theem.
andesitic txhais li cas?
Kev txhais lus rau andesitic Ib tug grey, nplua-grained volcanic pob zeb. Andesite Feem ntau muaj sodium-nplua nuj plagioclase feldspar thiab ib los yog ntau dua mafic minerals xws li biotite, hornblende, los yog pyroxene. Nws feem ntau muaj me me, pom muaju (phenocrysts) ntawm plagioclase.
Pom zoo:
Dab tsi yog qhov txawv ntawm Marine West Coast huab cua thiab dab tsi yog lub luag haujlwm rau cov yam ntxwv ntawd?
Cov ntsiab lus ntawm Marine West Coast Qhov kev nyab xeeb ntawm cov yam ntxwv tseem ceeb yog lub caij ntuj sov me me thiab lub caij ntuj no thiab cov nag lossis daus txhua xyoo. Qhov ecosystem no muaj kev cuam tshuam loj heev los ntawm nws qhov ze rau ntawm ntug dej hiav txwv thiab roob. Nws yog qee zaum hu ua huab cua sab hnub poob ntug dej hiav txwv lossis dej hiav txwv huab cua
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