Olivine thiab augite yog cov zaub mov porphyritic tshaj plaws hauv bas alts; porphyritic plagioclase feldspars kuj pom.
Puas bas alt muaj olivine?
A bas alt yog cov pob zeb zoo-grained igneous pob zeb uas muaj qhov tseem ceeb calcic plagioclase feldspar thiab pyroxene (feem ntau Augite), nrog lossis tsis muaj olivine. Bas alts tuaj yeem muaj quartz, hornblende, biotite, hypersthene (ib qho orthopyroxene) thiab feldspathoids. … Picrites yog bas alts muaj ntau olivine.
bas alt yog dab tsi?
Cov ntxhia hauv bas alt suav nrog olivine, pyroxene, thiab plagioclase. Bas alt tau tawg ntawm qhov kub ntawm 1100 txog 1250 ° C. Volcanic pob zeb (los yog lava) uas cov yam ntxwv yog xim tsaus (grey mus rau dub), muaj 45 mus rau 53 feem pua silica, thiab yog nplua nuj nyob rau hauv hlau thiab magnesium.
pob zeb dab tsi muaj olivine?
Olivine tshwm sim nyob rau hauv ob qho tib si mafic thiab ultramafic igneous pob zebthiab ua cov pob zeb tseem ceeb hauv qee cov pob zeb metamorphic. Mg-nplua nuj olivine crystallizes los ntawm magma uas yog nplua nuj nyob rau hauv magnesium thiab tsawg hauv silica. Qhov magma crystallizes rau mafic pob zeb xws li gabbro thiab bas alt.
pob zeb twg muaj olivine tshaj plaws?
Feem ntau cov olivine pom ntawm lub ntiaj teb saum npoo yog nyob rau hauv tsaus nti-xim pob zeb. Nws feem ntau crystallizes nyob rau hauv lub xub ntiag ntawm plagioclase thiab pyroxene tsim gabbro los yog bas alt. Cov pob zeb no feem ntau tshwm sim nyob rau ntawm divergent phaj ciam teb thiab thaum kubcov chaw nyob hauv nruab nrab ntawm daim phiaj tectonic.
