Video: Yuav ua li cas ciam teb tsim cov kob arcs?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib kob arc yog ib tug curving series ntawm volcanic cov kob uas yog tsim los ntawm kev sib tsoo ntawm tectonic daim hlau nyob rau hauv ib qho chaw dej hiav txwv. Hom phaj tshwj xeeb ciam teb uas yield kob arcs hu ua subduction zone. Nyob rau hauv ib cheeb tsam subduction, ib lub phaj lithospheric (crustal) yog yuam downward nyob rau hauv ib lub phaj sab sauv.
Yog li ntawd, dab tsi phaj ciam ua cov kob arcs?
Island arcs yog ntev chains ntawm active volcanoes nrog hnyav seismic kev ua si 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.
Qhov thib ob, volcanic Island arcs tsim li cas? Kub, remelted cov ntaub ntawv los ntawm subducting slab nce thiab xau mus rau hauv lub crust, ua ib tug series ntawm roob hluav taws . Cov no roob hluav taws tuaj yeem ua cov saw hlau cov kob hu ua " kob arc ". Island Arcs yog tsim nyob rau ntawm ntug kev tawm tsam ntawm ib tug subducted slab.
Ua raws li qhov no hauv kev txiav txim siab, ua li cas cov kob arc tsim ntawm ib thaj tsam convergent?
Dej hiav txwv-Ocean Convergence Raws li lub phaj subducting yog thawb tob rau hauv lub mantle, nws melts. Lub magma no tsim nce thiab erupts. Qhov no daim ntawv ib kab ntawm volcanoes, hu ua ib kob arc (Daim duab hauv qab no). A convergent phaj ciam teb subduction cheeb tsam ntawm ob daim hlau ntawm dej hiav txwv lithosphere.
Dab tsi ntawm phaj ciam teb tsim subduction?
Subduction zones yog qhov chaw ntawm gravitational sinking ntawm lub ntiaj teb lithosphere (lub crust ntxiv rau sab saum toj tsis-convecting feem ntawm lub Upper mantle). Subduction zones muaj nyob rau ntawm convergent phaj ciam teb qhov twg ib phaj ntawm dej hiav txwv lithosphere converges nrog rau lwm phaj.
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