Video: Cov pob zeb dab tsi nyob hauv Grand Canyon?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv Grand Canyon , unconformities yog muaj nyob rau hauv lub Grand Canyon Supergroup thiab Paleozoic Strata. Peb hom tseem ceeb ntawm pob zeb yog igneous, sedimentary thiab metamorphic. Igneous pob zeb yog txias magma (melted pob zeb pom underground) los yog lava (molten pob zeb pom saum av).
Ib yam li ntawd, muaj pes tsawg txheej pob zeb nyob hauv Grand Canyon?
Ze li ntawm 40 lub pob zeb loj sedimentary tau nthuav tawm hauv Grand Canyon thiab hauv Grand Canyon National Park thaj tsam muaj hnub nyoog li ntawm 200 lab mus txog ze li 2 billion xyoo.
Tom qab ntawd, lo lus nug yog, dab tsi yog txheej saum toj kawg nkaus ntawm Grand Canyon ua los ntawm? Cov sab saum toj txheej ntawm Grand Canyon , Kaibab Limestone, muaj ntau cov pob txha hauv hiav txwv uas qhia tau hais tias nws nyob hauv qab hiav txwv. Qhov no txheej yog nyob ib ncig ntawm 250 lab xyoo.
Ntawm no, dab tsi yog qhov qub tshaj plaws ntawm pob zeb hauv Grand Canyon?
Nco ntsoov, lub pob zeb qub hauv Grand Canyon yog 1.8 billion xyoo. Cov hav dej yog hluas tshaj qhov pob zeb los ntawm qhov nws cua. Txawm tus yau pob zeb txheej , Kaibab Formation, yog 270 lab xyoo, ntau xyoo laus dua cov hav dej nws tus kheej. Geologists hu rau cov txheej txheem ntawm hav dej tsim downcutting.
Dab tsi yog qhov qub tshaj plaws sedimentary txheej hauv Grand Canyon?
Hauv cheeb tsam ntawm Carbon Butte qis txheej kuj muaj ib feem loj ntawm reddish sandstone. Cov shales nyob rau hauv no txheej yog cov dub thiab cov av nkos xws li liab mus rau ntshav. Fossils yuav pom nyob rau hauv no txheej yog cov stromatolites, cov hlob fossils yuav pom nyob qhov twg hauv lub Grand Canyon.
Pom zoo:
Dab tsi yog qhov txawv ntawm cov pob zeb tsis foliated thiab foliated metamorphic pob zeb?
Foliated metamorphic pob zeb xws li gneiss, phyllite, schist, thiab slate muaj ib txheej txheej los yog banded zoo li uas yog tsim los ntawm raug tshav kub thiab qhia siab. Non-foliated metamorphic pob zeb xws li hornfels, marble, quartzite, thiab novaculite tsis muaj txheej txheej lossis banded zoo li
Muaj pes tsawg txheej pob zeb nyob hauv Grand Canyon?
40 Ib yam li ntawd, nws raug nug, hom pob zeb twg ua rau Grand Canyon? sedimentary pob zeb Ib sab saum toj no, dab tsi yog qhov qub tshaj plaws ntawm pob zeb hauv Grand Canyon? Nco ntsoov, lub pob zeb qub hauv Grand Canyon yog 1.
Dab tsi yog pob zeb tsim cov ntxhia pob zeb?
Cov pob zeb tsim cov zaub mov yog: feldspars, quartz, amphiboles, micas, olivine, garnet, calcite, pyroxenes. Minerals tshwm sim nyob rau hauv ib lub pob zeb nyob rau hauv me me yog hu ua "accessory minerals"
Dab tsi yog cov pob zeb niam txiv ntawm cov pob zeb metamorphic?
Metamorphic pob zeb Metamorphic pob zeb Texture Niam txiv pob zeb Phyllite Foliated Shale Schist Foliated Shale, granite thiab volcanic pob zeb Gneiss Foliated Shale, granite thiab volcanic pob zeb Marble Nonfoliated Limestone, dolostone
Cov pob zeb hauv av twg tuaj yeem tsim cov pob zeb zoo li lub raum?
Hematite (los yog haematite) Kuj tseem muaj ntau hom hematite, qee yam yog: raum ore, ib qho loj, botryoidal (lumpy) lossis reniform (lub raum zoo li tus) daim ntawv; specularite, micaceous (flaky) daim ntawv; oolitic, ib daim ntawv sedimentary tsim los ntawm cov nplej me me; liab ochre, ib daim ntawv liab earthy