Video: Dab tsi yog qhov txawv ntawm ib kob arc thiab continental volcanic arc?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
A volcanic kob arc yog tsim thaum ob daim phiaj dej hiav txwv converge thiab tsim ib cheeb tsam subduction. Cov magma uas ua los ntawm basaltic muaj pes tsawg leeg. A continental volcanic arc yog tsim los ntawm subduction ntawm ib tug dej hiav txwv phaj hauv qab a teb chaws Europe phaj. Cov magma tsim muaj ntau silica nplua nuj tshaj qhov tsim ntawm ib volcanic kob arc.
Raws li, yuav ua li cas yog continental arc txawv ntawm ib tug kob arc?
Vim tias thaj tsam subduction (uas kuj yog lub phaj ciam teb) feem ntau yog ib qho arc -zoo li, geologists hu ua cov volcanoes volcanic arcs . Ib lub roob hluav taws arc ua rau teb chaws Europe crust npe a continental arc ; Thaum ua rau dej hiav txwv crust lub volcanoes tsim ib qho kob arc.
Ib sab saum toj no, lub ntsiab lus ntawm volcanic Island arc yog dab tsi? A volcanic arc yog chain of roob hluav taws tsim saum lub phaj subducting, positioned nyob rau hauv ib tug arc zoo li pom los saum toj no. Offshore roob hluav taws daim ntawv cov kob , ua rau a volcanic kob arc . Lub magma nce mus ua ib qho arc ntawm roob hluav taws parallel rau thaj tsam subduction.
Nyob rau hauv no hais txog, hom ntawm ciam teb yog ib tug volcanic kob arc?
Island arcs yog ntev chains ntawm active roob hluav taws nrog kev ua haujlwm hnyav seismic pom nyob rau hauv convergent tectonic phaj ciam teb (xws li Ring of Fire). Feem ntau kob arcs Keeb kwm ntawm dej hiav txwv crust thiab tau tshwm sim los ntawm qhovntsej thiaj tsis mob ntawm lithosphere mus rau hauv lub mantle raws subduction cheeb tsam.
Island arc yog dab tsi thiab nws tsim li cas?
Ib kob arc yog ib tug saw lossis pab pawg cov kob uas daim ntawv los ntawm volcanic kev ua ub no nyob rau hauv ib cheeb tsam subduction. Subduction tshwm sim thaum dej hiav txwv lithosphere dab dej hauv qab teb chaws los yog dej hiav txwv lithosphere. Lub sinking pob zeb melts mus rau hauv lub magma nyob rau hauv lub asthenosphere thiab ib co los rau saum npoo, tsim volcanoes.
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