Qhov kev tsis sib haum xeeb loj sib cais li cas?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36

Cov Kev tsis sib haum xeeb loj ntawm Powell hauv Grand Canyon yog ib cheeb tsam kev tsis sib haum xeeb uas cais Pawg Tonto los ntawm lub hauv paus, faulted thiab tilted sedimentary pob zeb ntawm Grand Canyon Supergroup thiab vertically foliated metamorphic thiab igneous pob zeb ntawm Vishnu Basement Pob zeb.

Yog li ntawd, qhov kev tsis sib haum xeeb loj yog dab tsi?

Cov Kev tsis sib haum xeeb loj nthuav tawm hauv Grand Canyon cais cov Tapeats Sandstone los ntawm cov pob zeb Proterozoic thaum ub. Cov Great Unconformity sawv cev ~ 1.2 billion xyoo ntawm cov ntaub ntawv pob zeb uas ploj lawm, txawm tias yog vim kev yaig los yog tsis-deposition.

Qhov thib ob, qhov kev tsis sib haum xeeb zoo tshaj plaws nyob qhov twg? Qhov Kev Tsis Ncaj Ncees Zoo Tshaj Plaws nyob qhov twg, thiab nyob rau hauv txoj kev twg yog qhov tseem ceeb rau peb kev txhais lub ntiaj teb keeb kwm? Kev tsis sib haum xeeb loj tau pom thiab pom hauv peb Grand Canyon . Nws tuaj yeem pom ntawm lub hauv paus ntawm lub pob tsuas yog qhov uas cov phab ntsa nqes tawm kom tau raws li tus dej Colorado hauv qab no.

Ib yam li ntawd, tib neeg nug, ua li cas qhov kev tsis sib haum xeeb loj?

Lawv tau Ameslikas tsim 1.85-1.65 billion xyoo dhau los raws li ob peb txheej txheej ntawm sedimentary thiab volcanic pob zeb, tau metamorphosed rau schist thiab gneiss los ntawm faus thiab cua sov los ntawm granites ntawm ~ 1.4 billion xyoo, thiab ces txias thiab exhumed rau daim ntawv ib lub tiaj, pob zeb tiaj tiaj ntawm txog 550 lab xyoo.

Ib qho piv txwv ntawm kev tsis sib haum xeeb yog dab tsi?

Rau piv txwv , kev sib cuag ntawm 400-million-xyoo-laus sandstone uas tau tso los ntawm lub hiav txwv nce siab rau saum npoo av uas muaj hnub nyoog 600 lab xyoo yog ib qho kev tsis sib haum xeeb uas sawv cev rau lub sij hawm hiatus ntawm 200 lab xyoo.