Li no feem ntau dej hiav txwv crust yog tib lub thickness (7 ± 1 km). Cov kab sib kis qeeb heev (<1 cm. yr−1 ib nrab-tus nqi) ua rau nyias nyias (4–5 km tuab) li Lub mantle muaj lub caij txias rau upwellingthiab yog li nws hla lub solidus thiab melts ntawm tsawg dua qhov tob, yog li ua kom tsawg yaj thiab thinner crust.
Vim li cas dej hiav txwv crust thinner dua continental?
Los ntawm mantle convection, cov nplua nuj nyob hauv lub mantle tej zaum yuav kawg "recycled" raws li lawv ntog li crust-ua lava ntawm nruab nrab hiav txwv ridges thiab volcanoes. Ntau heev vim yog subduction, dej hiav txwv crust muaj ntau, ntau yau dua continental crust.
Dab tsi yog dej hiav txwv crust thinner dua continental crust?
Dej hiav txwv crust feem ntau yog tsim los ntawm cov pob zeb tsaus nti hu ua bas alt thiab gabbro. Nws yog thinner thiab denser dua continental crust, uas yog ua los ntawm lub teeb xim pob zeb hu ua andesite thiab granite. … Hloov siab, ntom aganic crust tsis "ntab" raws li kev ua haujlwm siab dua-pw hauv hiav txwv.
Dab tsi yog dej hiav txwv crust thickness?
Oceanic crust is kwv 6 km (4 mais) tuab. Nws yog tsim los ntawm ob peb txheej, tsis suav nrog cov sediment overlying.
Vim li cas dej hiav txwv crust thicker?
Dej hiav txwv crust yog txuas ntxiv tsim nyob nruab nrab ntawm dej hiav txwv ridges. Raws li daim hlau sib txawv ntawm cov ridges, magma nce mus rau hauv lub tsho loj thiab crust. … Thicker dua qhov nruab nrab crust yog pom saum toj noplumes raws li lub mantle yog kub duathiab yog li nws hla lub solidus thiab melts ntawm qhov tob dua, tsim ntau yaj thiab thicker crust.
