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Sedimentary pob zeb

Hais txog 75% ntawm qhov chaw ntawm lub ntiaj teb npog sedimentary pob zeb. Pawg no muaj ntau tshaj ib nrab ntawm cov zaub mov rho los ntawm cov bowels ntawm cov ntiaj chaw. Lawv mas teem rau lub continents, lub txee thiab continental nqes hav, thiab tsuas yog hais txog 15% yog nyob rau hauv qab ntawm lub dej hiav txwv.

Sedimentary pob zeb raug tsim los ntawm weathering khoom thiab redeposition deposition tshuaj dua nyob rau hauv ib tug aqueous nruab nrab (tej zaum nyob rau hauv av), thiab cov dej khov nyob rau hauv tus txheej txheem kev ua si. Nag lossis daus yuav tshwm sim nyob rau hauv ntau txoj kev. Nyob ntawm seb cov xwm, emit txawv pab pawg ntawm cov sedimentary pob zeb:

- clastic - yog cov kev tshwm sim mas lub cev weathering, tsiv teb tsaws thiab tom ntej redeposition ntawm cov khoom;

- colloidal sediments - yog tsim raws li ib tug tshwm sim ntawm cov tshuaj decomposition, nrog los ntawm cov tsim ntawm colloidal kev daws teeb meem ;

- chemogenic - tsim los ntawm nag lossis daus los ntawm aqueous tov raws li ib tug tshwm sim ntawm cov tshuaj tshua los yog tshwm sim los ntawm txawv ua supersaturation kev daws teeb meem;

- biochemical - qhov tshwm sim ntawm cov tshuaj tshua noj qhov chaw nrog kev koom tes uas muaj sia nyob;

- biogenic los yog organogenic - qhov tshwm sim ntawm cov kev ua ntawm tus kab mob no.

Feem ntau muaj cov cim qhia ntawm combining sib txawv pawg ntawm sedimentary pob zeb. Cov kev faib saum toj no hais txog lawv rau leej twg ib tug pab pawg neeg. Piv txwv li, limestone, uas tej zaum yuav clastic, organogenic, chemogenic los yog biochemical keeb kwm, yog biochemical hom.

Raws li cov tshuaj nyob tus yeees ntawm sedimentary pob zeb txawv los ntawm igneous pob zeb txoj kev ua ib tug loj tus naj npawb ntawm Cheebtsam thiab ib tug ntau dua ntau yam zoo. Qhov no yog vim hais tias cov khoom rau lawv tsim yog weathering khoom ntawm metamorphic, igneous thiab laus sedimentary pob zeb raws li gases thiab yaj nyob rau hauv tej yam ntuj tso dej mineral Cheebtsam, kab mob, khoom pov tseg, cov khoom ntawm volcanic eruptions thiab txawm tawg tsam ntawm meteorites (e.g., npib tsib xee hlau khoom ). Nyob rau hauv tas li ntawd, nyob rau hauv lawv cov muaj pes tsawg leeg feem ntau pom ib co kua nplaum ntawm ntev-txawm ploj ntais lub neej - cov pob txha muaj thiab fauna. Feem ntau, lub hnub nyoog yog lub hnub nyoog ntawm cov pob txha hom lawv tus kheej, tab sis muaj ntau ancient organic redeposited residues.

Ib txhia breeds (diatomite, nummulitovye thiab ntawm ntau hom ntawm limestone thiab lwm tus) nkaus li ntawm tus kab mob no (biomorphic) los yog lawv cov tawg tsam (detritusovye). Lub biomorphic (tselnorakovinnyh) fossils lug yog cais los ntawm txhua lwm yam los ntawm losis tswvyim dabtsi MAAs (brachiopod rakushnyaka) los yog tuaj tos nyob rau txhua lwm yam, txoj kev ua ib tug kev ntxhib los mos txoj kev loj hlob (coral los yog ntawm ntau hom ntawm limestone). Detritusovye lug yog tsim nyob rau hauv dej ntiav ntiav los ntawm qhov kev txiav txim ntawm kev rhuav tseg teeb plhaub los yog raws li ib tug tshwm sim ntawm kev muaj peev xwm mus nyob ua npua fragmenting lub plhaub rau lub hom phiaj ntawm cov zaub mov ntau lawm.

Sedimentary pob zeb raug tsim raws li nram no: kev puas tsuaj ntawm cov niam txiv pob zeb yog tsim ib tug pib khoom, uas yog pauv mus rau dej, cua los yog glaciers, thiab ces tso rau hauv lub saum npoo av thiab hauv qab ntawm cov dej phiab. Cov no yog muaj li ntawm txawv Cheebtsam precipitate, nkaus los yog noo nrog dej thiab muaj ib tug friable thiab ntxeem tau qauv. Qhov no precipitate, hloov nrog rau cov zaj uas lub sij hawm - thiab muaj ib tug sedimentary pob zeb.

sedimentation txheej txheem yuav siv sij hawm qhov chaw nyob rau hauv tus ntawm kev nyab xeeb thiab tectonic regime. Nyob rau hauv noo tej yam kev mob (kub thiab noo) kev nyab xeeb ua silts, txais av ya, diatomite, caustobioliths (pob txha fuels). Arid (qhuav) aav yus limestone, gypsum, anhydrite, pob zeb ntsev. Lub tais cheeb tsam noog tuab khaubncaws sab nraud povtseg ntawm sedimentary pob zeb, yus muaj los ntawm cov nta xws li variability nyob rau hauv qhov chaw thiab varied muaj pes tsawg leeg ntawm detritus. Nyob rau platforms, on qhov tsis tooj, tso stratum ntawm uas tsis muaj zog pob zeb nrog ib tug ntau yam muaj pes tsawg leeg ntawm detritus.

Vim lub fact tias cov tej yam kev mob ntawm sedimentation nyob rau hauv lub yav dhau los geological epochs nyob ze rau lub neej tshiab nimno los yog cov zoo li, nyob rau hauv lub hauv paus ntawm cov ntaub ntawv nyob rau hauv lub tsev ntawm sedimentary pob zeb nyob rau hauv lub ntiaj teb nto yuav tau recreated thiab paleotectonic PALEOGEOGRAPHY ntawm cov ntiaj chaw.

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