Video: Dab tsi yog qhov txawv ntawm ib qho ultramafic ib qho mafic nruab nrab thiab felsic pob zeb?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv ib Kev lees paub dav dav silica-cov ntsiab lus kev faib tawm, pob zeb nrog ntau dua 65 feem pua silica hu ua felsic ; cov nrog nruab nrab 55 thiab 65 feem pua silica yog nruab nrab ; cov nrog nruab nrab 45 thiab 55 feem pua silica yog mafic ; thiab cov uas muaj tsawg dua 45 feem pua ultramafic.
Yog li ntawd, dab tsi yog qhov txawv ntawm mafic thiab ultramafic pob zeb?
Igneous pob zeb raug cais raws li lawv cov ntsiab lus ntxhia: Ultramafic pob zeb yog dominated los ntawm olivine thiab/los yog pyroxene. Mafic pob zeb yog cov thawj coj los ntawm plagioclase thiab pyroxene (txawm tias koj tsis tuaj yeem pom lawv ntawm qhov muag liab qab) thiab me me ntawm olivine.
Kuj Paub, dab tsi yog pob zeb felsic? Felsic pob zeb yog igneous pob zeb uas yog nplua nuj nyob rau hauv feldspar thiab silicon. Lo lus ' felsic ' tau tsim los ntawm ib feem ntawm cov lus. Vim tias lawv tau ua los ntawm cov ntsiab lus sib zog, lawv nyiam ua kom muaj zog dua li mafic pob zeb ,qu yog pob zeb muaj magnesium thiab hlau, zoo li basalt. Granite yog feem ntau felsic pob zeb.
Tsis tas li ntawd, vim li cas ho muaj mafic nruab nrab thiab felsic magmas?
Felsic magmas muaj ntau viscous tshaj nruab nrab magmas . Vim yog lawv siab viscosity, felsic magmas tsis ncav cuag tus nto li feem ntau ua nruab nrab los yog mav mag . Txawm li cas los xij, vim nws cov ntsiab lus roj ntau, thaum felsic magma tawg, tus eruption yog tus ua phem tshaj plaws.
Yuav ua li cas koj qhia yog hais tias ib tug igneous pob zeb yog mafic los yog felsic?
Qhov kev faib tawm dav dav tshaj plaws yog nyob ntawm qhov txheeb ze ntawm kev nplua nuj nyob hauv a pob zeb ntawm felsic (feldspar thiab silica-quartz) minerals vs mafic (magnesium thiab ferrum lossis hlau) cov zaub mov. Felsic minerals (quartz, K feldspar, thiab lwm yam) yog lub teeb xim thaum mafic cov zaub mov (hornblende, pyroxenes) feem ntau yog xim tsaus.
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