Andesitic lava yog ib qho piv txwv ntawm a siab viscosity lava whereas balastic lava muaj viscosity tsawg, yog li muaj dej ntau. High silica cov ntsiab lus nyob rau hauv lub andesitic lava pab ua rau lub siab viscosity thiab tsawg silica cov ntsiab lus nyob rau hauv lub bas altic lava txhais tau hais tias nws yog ib tug qis viscosity.
viscosity ntawm andesitic lava yog dab tsi?
Andesitic magmas, tshwj xeeb, muaj ntau yam ntawm magma viscosities, los ntawm 102 txog 107 Pa s, uas yog vim muaj ntau yam hauv cov ntsiab lus phenocryst los ntawm 0 (phenocryst. -dawb andesitic yaj) mus rau ∼50 vol% (50 vol% rhyolitic yaj + 50 vol % phenocrysts). Kev tsom mus rau andesitic-to-rhyolitic magmas, r hloov mus rau −0.1.
Yog andesitic magma viscous?
Siliceous Lava Flows - High viscosity andesitic thiab rhyolitic lava ntws, vim tias lawv tsis tuaj yeem ntws tau yooj yim, tsim cov dej tuab tuab uas tsis txav deb ntawm lub qhov cua. Lava Domes lossis Volcanic Domes - tshwm sim los ntawm extrusion ntawm viscous heev, roj tsis zoo andesitic thiab rhyolitic lava.
lava khov heev?
Txawm tias lava muaj 100,000 npaug ntau dua li dej, nws tseem tuaj yeem ntws mus deb heev. Thaum lava muaj viscosity tsawg, nws tuaj yeem ntws tau yooj yim heev hauv qhov ntev. … Tab sis qhov tseem ceeb tshaj plaws, lava hnyav heev yog txuam nrog tawg tawg thiab txaus ntshai pyroclastic ntws.
Lub roob hluav taws uas khov li cas?
Stratovolcano . Stratovolcanoes muaj cov sab laug thiab muaj lub khob zoo li ntau dua li cov ntaub thaiv hluav taws xob. Lawv yog tsim los ntawm viscous, nplaum lava uas tsis ntws yooj yim.
