Qauv ntawm Sedimentary Pob zeb 24 Yam
24 Cov Khoom / lub thawv, lub thawv loj 39.5x23x4.5cm
Pob zeb yog cov khoom sib txuas ntawm cov ntxhia pob zeb thiab yog cov khoom siv tseem ceeb uas ua rau lub ntiaj teb ua kaub puab. Pob zeb tuaj yeem tsim nrog ib hom ntawm cov ntxhia, xws li limestone ua li ntawm tsuas muaj ib qho ntxhia ntawm calcite; nws tseem tuaj yeem yog tsim los ntawm ntau cov zaub mov, xws li granite, uas muaj li ntawm ntau cov zaub mov xws li quartz, feldspar, thiab mica. Feem ntau ntawm cov khoom siv los ua cov pob zeb yog cov khoom siv hauv dej. Pob zeb tuaj yeem muab faib ua peb pawg raws li lawv keeb kwm, tab sis vim tias xwm yog qhov txuas ntxiv, nws nyuaj rau kev faib ua peb lithologies raws li peb qhov kev faib tawm. Yog li ntawd, yuav muaj qee lub pob zeb hloov pauv, xws li tuff (hmoov av volcanic thiab pob zeb ntog). Tej zaum nws raug faib ua sedimentary pob zeb lossis cov pob zeb tsis zoo, tab sis nws tuaj yeem faib ua peb pawg loj: sedimentary pob zeb muaj txog 66% ntawm lub npoo thiab yog hom pob zeb tseem ceeb nyob rau saum npoo. Cov pob zeb uas tau tsim ua ntej ua rau detritus tom qab raug mob, lossis cov khoom seem ntawm cov tsiaj txhu, thiab lwm yam. Cov hom pob zeb no txhua txhua pawg huv si. Thawj qhov tso nyiaj yog nyob rau hauv qis dua. Lub hnub nyoog laus dua. Cov qib siab dua, qib dua tshiab lub hnub nyoog. Qhov no hu ua txheej txheem superimposed. Thaum cov pob zeb tau muab nqis, cov seem uas ntau cov kab mob muaj peev xwm tiv thaiv tau ntev thiab ua fossils tom qab raug faus; hauv cov pob zeb tsis ncaj, feem ntau tsis muaj fossils.
