Lokacin Cambrian

Cambrian

A cikin zamanin Paleozoic muna da lokuta da yawa wanda lokacin ilimin kasa. Rabo na farko nasa ne Cambrian. Rukuni ne na ƙididdigar yanayin ƙasa da farkon zamani shida na zamanin Paleozoic. Ya fara kimanin shekaru miliyan 541 da suka gabata kuma ya ƙare kimanin shekaru miliyan 485 da suka gabata. Lokaci na gaba shine Ordovician.

A cikin wannan labarin za mu mai da hankali kan dukkan siffofin, ilimin ƙasa, yanayi, fure da fauna na zamanin Cambrian.

Babban fasali

Dabbobin Cambrian

Wannan lokacin na tunanin Paleozoic ya fi yawa ta hanyar kasancewa babban tasiri a matakin ilimin ƙasa a duk duniya. An dauki dan Cambrian din yana tsawon shekaru miliyan 70 ne kawai, amma kimiyya ta iya gyara shi saboda bayanai daga bayanan burbushin halittu. Branchungiyar ilimin ƙasa wanda ke mai da hankali kan waɗannan canje-canjen da duniyar duniyar ta fuskanta tun lokacin da aka ƙirƙira ta ita ce tarihin kasa.

Duk wannan lokacin yana karɓar sunan Cambrian daga sunan da ya zo daga Cambria. Wannan sunan shine nau'in Latin wanda yake Cymru wanda yake nufin Wales. Wales a yau ne inda aka gano ragowar ilimin ƙasa na wannan lokacin. Tare da wannan rarrabuwar ilimin kasa akwai babban fashewar rayuwa a karo na farko da aka samu a burbushin halittu. Na farko za'a iya rarrabe kwayoyin halittu da yawa wadanda suka fi rikitarwa fiye da soso ko jellyfish.

Daga cikin mahimman halittu na wannan lokacin akwai algae kore waɗanda kusan ƙananan milimita kaɗan ne a diamita saboda trilobites. Waɗannan trilobites sanannen rukuni ne na arthropods waɗanda suka sami damar tsira da yawa daga halaka. Wannan fitowar rayuwa ana kiranta fashewar Cambrian kuma yana ɗaya daga cikin manyan abubuwan da suka nuna iyakar tsakanin Neoproterozoic da zamanin Cambrian.

Zamanin zamanin Cambrian

Rubutun burbushin halittu

A wannan lokacin ana tunanin cewa nahiyoyin sun samo asali ne sakamakon rarrabuwa da wata babbar kasa da ta riga ta wanzu da Neoproterozoic kuma ana kiranta Pannotia. Mafi girman yanki na manyan kasashen shine Gondwana kuma yana kudu tare da kananan nahiyoyi 3 da ake kira Laurentia, Siberia da Baltic. Wadannan nahiyoyin suna tafiya arewa saboda motsi na Farantin Tectonic da ke motsa ta hanyar isar ruwa na duniya ta alkyabbar.

Wannan shine yadda guguwar nahiyoyi suka fara kafa matsayin da muka sani a yau. Adadin guguwar nahiyoyi a cikin zamanin Cambrian an kiyasta sun yi mummunan yanayi idan aka kwatanta da lokutan da suka gabata. Wannan yana nufin cewa akwai babban aiki na faranti na tectonic. Godiya ga waɗannan ƙungiyoyi na nahiyoyi, zai yiwu a ƙara yawan halittu daban-daban a matakin duniya tunda an halicci halittu da halaye daban-daban.

Tekun Panthalassa shine ya mamaye yawancin duniya, yayin da aka sami wasu ƙananan tekuna kamar proto-Tethys da Khanty teku a tsakanin ruwan ƙananan ƙananan nahiyoyin da ake kira Laurentia da Baltic.

Yanayin Cambrian

Adadin Cambrian

Yanayi na lokacin Cambrian ya yi amannar ya fi ɗumammu zafi fiye da lokutan baya. A wannan lokacin babu lokacin kankara a sandunan. Wato, babu wata sandar ƙasa da aka rufe da kankara. Hakanan, lokacin Cambrian ya kasu kashi biyu: Lower Cambrian, Middle Cambrian da Upper Cambrian. Zamu nazarci yanayi da yanayin kasa a takaice a kowane zamanin da muke ciki.

  • Cananan Cambrian: A wannan lokacin nahiyar ta Gondwana da sauran ƙananan talakan ƙasa sun mamaye dukkan yankuna na yankin. Wannan sanannen sananne ne ga bayanan adon farar ƙasa a cikin teku mai yalwa da epicontinental na wurare masu zafi. A wancan lokacin, Cadomian orogeny shine abin da ya haifar da lokutan fitowar manyan ƙasashe a farkon Cambrian.
  • Tsakiyar Cambrian: a wannan lokacin akwai sake zagayowar wuce gona da iri wanda aka sami matsala ta hanyar bugun jini biyu.
  • Babban Cambrian: Wani yanki mai yawa na yankin na Gwanawana, wanda ya mamaye wurare masu daidaito, yana matsawa zuwa sararin samaniyar sanyi. Ana maye gurbinsu a mukamai tun lokacin da kananan kasashen nahiyar kamar Laurentia, Siberia da Ostiraliya suke rike da mukamai.

Blastarfin rai

Rayuwar lokacin Cambrian

Kamar yadda muka ambata a baya, wannan sanannen sanannen lokaci ne na rabe rabuwa inda akwai fashewar rayuwa mai tsanani fiye da yadda aka sani. An san shi da fashewar Cambrian. Wannan fashewar ya haifar da bayyanar halittu masu ban mamaki a duniya wadanda suka hada da yawancin kungiyoyin dabbobi da muka sani a yau.

Daga cikin waɗannan dabbobin da suka ɓullo, za mu ga irin waƙoƙin da ƙwararrun halittu suke da shi wanda ya haɗa da mutane. Ba a san takamaiman yadda irin wannan fashewar fashewar halittar ta yiwu ba. An yi imanin cewa zai iya kasancewa iskar oxygen da ke cikin yanayi sannan kuma, saboda hayakin da cyanobacteria da algae suka fitar wanda ke aiwatar da hotuna, zai iya kai matakin da ya kamata ga dukkan ƙwayoyin halitta don su sami ci gaban kansu. mafi hadaddun tsarin bada siffofin rayuwa daban-daban.

Wani bangare da za a yi la’akari da shi yanayin da ya sa ya zama mai karɓar baƙi yayin da yanayi ke ɗumi da kuma matakin teku. Ta wannan hanyar, an ƙirƙiri mazaunan ruwa marasa zurfin ciki waɗanda suka dace don samar da sababbin sifofin rayuwa tunda akwai abubuwan gina jiki da yawa.

Koyaya, ana tunanin cewa masana kimiyya da yawa sun yi karin gishiri game da girman fashewar Cambrian saboda yawaitar dabbobi masu tsari mai wuyar sha'ani wanda ya yi sauri ya zama mafi sauri fiye da magabata. Kamar wannan duka kuna iya samun rubutattun tarihi kawai ya dogara da tsarin jiki. Idan jiki yayi laushi ba za'a iya yin burbushin shi ta hanya guda ba. Misali, an san abubuwa da yawa game da burbushin halittu wadanda suka rayu a cikin kwalayen-kwari da kwari da sauran dabbobin da ke da kwarangwal na waje wadanda aka sansu a yau kamar yadda ake kira arthropods.

Ina fatan cewa tare da wannan bayanin zaku iya ƙarin koyo game da zamanin Cambrian.


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