Esinye sezikali ze isikhathi sokuma komhlaba ezakha i I-Precambrian yiyona I-Proterozoic. Lena i-Eon eyaqala cishe eminyakeni eyizigidi eziyizinkulungwane ezingu-2500 edlule futhi yahlala kwaze kwaba yiminyaka eyizigidi ezingu-542 edlule. Ngalesi sikhathi, kwaba nezinguquko ezinkulu, eziphawulekayo eplanethini enguMhlaba, kuhlanganise nokuvela kwezinto eziphilayo zokuqala ze-photosynthetic kanye nokwanda komoya-mpilo emkhathini. Okusho ukuthi, phakathi nale Eon iplanethi yethu yaba indawo okuhlalwa kuyo.
Kulesi sihloko sizokutshela konke mayelana nezici, i-geology, isimo sezulu, izitshalo nezilwane ze-.
Izici eziyinhloko
Phakathi kwezici eziyinhloko ezivelele ku-Proterozoic esizitholayo ukuba khona kwama-cratons emhlabeni wethu. Lawa ma-craton ayilutho ngaphandle kwezakhi lapho amazwekazi ayekhona. Lokho wukuthi, ama-craton kwakuyizakhiwo zokuqala lapho kwakungakhiwa futhi kwakhiwe amashalofu ezwekazi. Lawa ma-craton akhiwe ngamatshe asendulo. Endulo lamadwala asukela eminyakeni eyizigidi ezingama-570 kuya eminyakeni engu-3.5 giga.
Isici esiyinhloko amakhratoni anaso yilokho abahlushwa yiluphi uhlobo lokwephuka kokwakheka eminyakeni edlule. Lezi yizindawo ezizinzile kakhulu koqweqwe lomhlaba wonke. Futhi siyabona ukuthi ngesikhathi se-Proterozoic stromatolites kwavela. Ziyizakhiwo ezakhiwe ngama-microorganisms kanye ne-calcium carbonate. Lezi stromatolites sezifundwe ososayensi isikhathi eside futhi kutholakale ukuthi azina-cyanobacteria kuphela kepha kukhona nezinto ezifana nesikhunta, izinambuzane, ulwelwe olubomvu, njll.
Lawa ma-stromatolite enza amarekhodi e-geological abaluleke kakhulu ocwaningweni lokuphila emhlabeni. Esinye isici esagqama ku-Proterozoic kwaba ukwanda kokugcwala komoyampilo emkhathini. Ngenxa yalokhu kwanda komoya-mpilo emkhathini, kungenzeka umsebenzi omkhulu wezinto eziphilayo, esingawuqonda kangcono uma sicabangela Izinto eziphilayo ze-Archean. I-oksijini yasemkhathini ayizange ifinyelele izinga elibalulekile kodwa yasiza ekuthuthukiseni ukuhlukahluka kwezinto eziphilayo.
Kube nomcimbi omkhulu noma owodwa obaluleke kakhulu nokubaluleka okubandakanya uchungechunge lwemicimbi ehlobene nalokhu kwanda komoya-mpilo womkhathi. Futhi ukuthi inani lomoya-mpilo lidlule inani eliphakeme kakhulu lapho ukusabela kwamakhemikhali bekwazi ukumunca. Izinto eziphilayo ze-Anaerobic zathinteka ngokuqondile futhi abantu bazo baqala ukwehla. Lezi zidalwa zazibizwa ngokuthi ama-methanogen, njengoba umthombo wazo oyinhloko wokudla kwakuyi-methane. Lokhu kushabalala kwe-methane kwaba nemiphumela yesimo sezulu eyabangela ukuba amazinga okushisa emhlabeni ehle kakhulu.
I-Proterozoic Geology
Ulwazi oluncane olutholakalayo mayelana nale Eon, kodwa kuyaziwa ukuthi izinguquko eziyinhloko zazisezingeni le-plate tectonics. Ngaleso sikhathi iplanethi yethu yayizungeza ngokushesha okukhulu eksisini yayo kunanamuhla. Lokhu kwakusho ukuthi usuku eMhlabeni lwaluthatha amahora angama-20 kuphela. Ngokuphambene nalokho, ukunyakaza kokuhumusha kwakunejubane elincane kunanamuhla. Ngale ndlela, unyaka ogcwele wawuyizinsuku ezingama-450.
Imininingwane enhle itholakele emadwaleni avela ku-Proterozoic. Lawa matshe akhubazekile ngomphumela wokuguguleka komhlaba, yize amanye engatakulwa kungabi khona noshintsho.
Izimbali nezilwane zeProterozoic
Ngalesi sikhathi lapho izinhlobo zokuqala zempilo yemvelo zaqala ukuthuthuka ngemuva kokuvela kwazo ngesikhathi se-. Kwakungenxa yenguquko eyenzeka emkhathini lapho izidalwa eziphilayo zakwazi ukuhlukahluka futhi zasakazeka endaweni yonke. I-ecosystem ngokwayo yaqala ukudalwa futhi izitshalo nezilwane eziqondene ne-ecosystem ngayinye zaqala ukukhula. Lokhu kungenxa yokuguquguquka kofuzo, okwenzeka lapho isilwane noma isitshalo kufanele sivumelane nezimo ezihlukahlukene zemvelo.
Izinto eziphilayo ze-Prokaryotic zaqala ukukhula ngesikhathi se-Archaic, kepha athuthuka ngokuqhubekayo ngesikhathi seProterozoic. Phakathi kwalezi zinto eziphilayo ze-prokaryotic sithola i-algae eluhlaza eyaziwa ngokuthi i-cyanobacteria kanye nama-bacteria jikelele uqobo.
Ngesikhathi sokuhamba kwalesi sikhathi se-Eon siyabona ukuthi kwavela izidalwa zokuqala ze-eukaryotic esevele zine-nucleus echaziwe. Ubulembu bokuqala obuluhlaza bekilasi lamaChlorophytas nobulembu obubomvu besigaba samaRodhophytas baba ngabokuqala ukuvela. Womabili la makilasi algae angama-multicellular kanye ne-photosynthetic. Ngokwenza i-photosynthesis, baba nomthelela ekuxoshelweni komoya-mpilo emkhathini.
Kubalulekile ukuqaphela ukuthi zonke izinto eziphilayo ezahlala ngesikhathi se-Proterozoic Eon bakwenza ezindaweni ezinamanzi. Futhi kwakusolwandle lapho izimo ezincane ezidingekayo zokusinda zatholakala. Ngalo mqondo, kuyathakazelisa ukwazi kangcono Izilwane ze-Ediacara.
Ngokuphathelene nezilwane, singasho ukuthi ngalesi sikhathi sesikhashana ezinye izinto eziphilayo namuhla ezibhekwa njengokuguquka okuncane zatholwa, njengezipanji. Kungenzeka ukuthi kutholakale izinsalela zezilwane eziseqenjini elibanzi ezikuzo i-jellyfish, amakhorali, ama-polyp kanye nama-anemones. Isici esiyinhloko salawa maqembu ezilwane ukuthi anokulinganisa okuningana.
Impela nizwile ngoJehova. Lokhu ukutholakala kwezinsalela zezinto eziphilayo ezazimelela izidalwa eziphilayo zakudala ezaziwayo kule planethi. Kwabonwa izinsalela zezipontshi nama- anemone, kanye nezinye izinhlobo zezilwane ezisaxaka izazi ze-paleontology.
Isimo sezulu
Ekuqaleni kweProterozoic isimo sezulu sasizinzile. Umkhathi wawunenani elikhulu lamagesi abamba ukushisa, okuyigesi ye-methane egqamayo. Nokho, ngemva kokuthuthukiswa kwe-cyanobacteria nokukhiqizwa kwezinto eziphilayo ze-photosynthetic, ukukhululwa okukhulu komoya-mpilo emkhathini kwenzeka. Lokhu kubangele ukuncipha kwegesi ye-methane emkhathini ngenxa yokufa kwezidalwa eziphila emanzini. Njengoba inani lamagesi abamba ukushisa emkhathini lalincipha, imisebe yelanga yancipha, ngakho amazinga okushisa embulunga yonke ehla.
Ngesikhathi seProterozoic kwakukhona izinguzunga ezimbalwa. Okubi kakhulu kwakuyinkathi yeqhwa laseHuronia. Le glaciation yenzeka eminyakeni eyizigidi ezingama-2.000 XNUMX edlule futhi yaholela ekunyamalaleni kwezidalwa eziphilayo ezazikhona ngaleso sikhathi.
I-Proterozoic Aeon ihlukaniswe kakhulu ngezikhathi ze-3: KwakunguPaleoproterozoic, kwakunguMesoproterozoic, futhi kwakuyiNeoproterozoic.
Ngiyethemba ukuthi ngalolu lwazi ungafunda kabanzi ngeProterozoic.