Cratons yog cov khoom ntawm cov teb chaws uas tau ruaj khov rau ntau tshaj li ib txhiab xyoo. … Economically lawv tseem ceeb heev – feem ntau ntawm lub ntiaj teb no lub pob zeb diamond los ntawm cratonic cheeb tsam li ua ntau lwm yam muaj nqis deposits. Cratons yog khov kho vim lawv muaj zog.
craton yog dab tsi thiab vim li cas nws tseem ceeb?
lo lus craton yog siv txhawm rau paub qhov txawv ntawm qhov ruaj khov ntawm cov teb chaws sab av loj los ntawm cov cheeb tsam uas muaj geologically nquag thiab tsis ruaj khovCratons tuaj yeem piav qhia raws li cov ntaub thaiv npog, hauv qab daus pob zeb cov qoob loo tawm ntawm qhov chaw, thiab cov platforms, hauv qab daus yog overlayed los ntawm sediments thiab sedimentary pob zeb.
Dab tsi yog qhov tshwj xeeb ntawm cratons?
Defining ib craton. Txawm hais tias lithospheric mantle suav nrog txog li 80% ntawm cov tuab ntawm cov phiaj xwm sab av loj, lub hauv paus chiv keeb thiab kev hloov pauv ntawm cov hauv paus tob no tseem muaj kev sib cav. Cratons tsim tawm ntau dua 90% ntawm lub ntiaj teb kub thiab platinum thiab yuav luag 100% ntawm nws cov pob zeb diamond.
Nyob hauv ntiaj teb no muaj pes tsawg cratons?
muaj ca. 35 cov pob zeb loj ntawm Archean hnub nyoog thoob plaws ntiaj teb, Archean cratons (s.s.). Cov no tau tshwm sim los ntawm kev tawg ntawm cov loj, ib ntus, lig Archean landmasses, uas peb hu ua "supercratons ".
cratons tsim li cas?
Lub ntiaj teb ntog tej zaum tawg mus rau hauv ntau daim phiaj me me nrog cov volcanic Islands tuaj thiab arcs nyob rau hauv ntau. Me me protocontinents (cratons) tsim raws li pob zeb crustal tau yaj thiab rov qab los ntawm cov chaw kub thiab rov ua dua nyob rau hauv subduction zones.
