Cov no viscous lavas muaj qhov sib piv siab (thickness / cheeb tsam), feem ntau > 1/100, thiab qee qhov tuab txaus los ua cov lava domes. Andesite feem ntau erupts los ntawm stratovolcanoes stratovolcanoes Lub lava ntws los ntawm stratovolcanoes feem ntau txias thiab hardens ua ntej kis mus deb, vim muaj viscosity siab. Lub magma tsim cov lava no feem ntau yog felsic, muaj qib siab-rau-nruab nrab ntawm silica (xws li hauv rhyolite, dacite, los yog andesite), nrog rau tsawg dua-viscous mafic magma. https://en.wikipedia.org › wiki › Stratovolcano
Stratovolcano - Wikipedia
qhov chaw uas lawv tsim cov ntim me me uas feem ntau ua ntej tsuas yog luv luv hauv qab ntawm lub roob hluav taws.
andesite lava yog dab tsi?
Andesite yog a grey rau dub volcanic pob zebnrog li ntawm 52 thiab 63 qhov hnyav feem pua silica (SiO2). … Ntawm qhov kawg ntawm silica ntau yam, andesite lava kuj tseem muaj olivine. Andesite magma feem ntau erupts los ntawm stratovolcanoes raws li tuab lava ntws, qee qhov ncav cuag ob peb km ntev.
Dab tsi yog qhov txawv ntawm andesitic thiab bas altic lava?
Ob lub lavas yog tsim los ntawm cov phaj sib txawv uas yog vim li cas lawv muaj cov ntsiab lus silica sib txawv: bas altic lava cov ntaub ntawv los ntawm cov khoom kub mantle ntawm kev tsim phaj ciam teb thiab hotspots whereas andesitic lava cov ntaub ntawv ntawm cov phaj puas ciam teb los ntawm melting crust.
andesitic lava tsim li cas?
Andesitethiab diorite yog cov pob zeb ntawm cov pob zeb sab av loj saum cov cheeb tsam subduction. Lawv feem ntau tsim tom qab lub phaj dej hiav txwv melts thaum lub sij hawm nws qhovntsej thiaj tsis mob mus rau hauv cheeb tsam subduction los tsim ib qhov chaw ntawm magma. … Andesite yog ib lub pob zeb zoo uas tsim thaum cov magma tawg rau saum npoo thiab crystallizes sai.
Lub roob hluav taws twg muaj andesitic lava?
Shield volcanoes yog tsim los ntawm bas altic magma, feem ntau saum lub mantle plume, whereas the stratovolcanoes (qee zaum hu ua volcanoes sib xyaw) yog tsim los ntawm andesitic/rhyolitic magma.
