Yuav ua li cas dej hiav txwv basins evolve?
Yuav ua li cas dej hiav txwv basins evolve?

Video: Yuav ua li cas dej hiav txwv basins evolve?

Video: Yuav ua li cas dej hiav txwv basins evolve?
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Tshooj 3 - Cov evolution ntawm dej hiav txwv phiab

Dej hiav txwv phiab daim ntawv pib los ntawm stretching thiab splitting (rifting) ntawm continental crust thiab los ntawm qhov sawv ntawm mantle cov ntaub ntawv thiab magma mus rau hauv lub tawg los tsim tshiab dej hiav txwv lithosphere. Ntawm qhov loj dej hiav txwv phiab , Atlantic muaj cov qauv yooj yim tshaj plaws ntawm dej hiav txwv - xyoo pua

Cia li xav txog qhov no, dab tsi yog dej hiav txwv phiab thiab nws tsim li cas?

Ib dej hiav txwv yog tsim thaum dej tau npog ib feem loj ntawm lub ntiaj teb crust. Nyob rau yav dhau los, qhov no yuav tshwm sim thaum muaj kev nce hauv dej, lossis poob ntawm thaj av.

Tsis tas li ntawd, 4 lub pas dej hiav txwv loj yog dab tsi? Plaub lub hauv paus dej hiav txwv tseem ceeb yog cov Pacific, Atlantic , Indian, thiab Arctic Oceans. Cov Dej hiav txwv Pacific , uas occupies txog ib feem peb ntawm lub ntiaj teb nto, muaj lub pas dej loj tshaj plaws. Nws lub phiab kuj muaj qhov tob tshaj qhov nruab nrab ntawm kwv yees li 14,000 feet (4, 300 meters).

Yog li ntawd, dej hiav txwv bass hloov loj npaum li cas?

Geologically, ib dej hiav txwv dej tej zaum yuav nquag hloov loj los yog tej zaum kuj, tectonically inactive, nyob ntawm seb puas muaj ib tug txav phaj tectonic ciam teb nrog nws. Lub Pacific Dej hiav txwv kuj yog ib qho active, shrinking dej hiav txwv dej , txawm hais tias nws muaj ob qho tib si nthuav dav thiab dej hiav txwv cov trench.

Plaub theem ntawm evolution ntawm lub hiav txwv phiab los ntawm thawj mus txog rau kawg yog dab tsi?

a) (1) Sab saum toj crust yog deformed los ntawm ductile stretching thaum lub sab saum toj crust yog tawg raws li ib txwm faults; (2) nro rub sib nrug ntawm cov crusts thiab crust slab dab nyob rau hauv nruab nrab, tsim ib tug rift hav; (3) txuas txuas ntxiv ua kom nqaim hiav txwv ; (4) tom qab txuas ntxiv mus, ib dej hiav txwv thiab ridge system yog tsim.

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