Stratigraphic record and palaeogeographic context of the Cambrian Epoch 2 subtropical carbonate platforms and their basinal counterparts inSW Europe, West Gondwana

Bulletin of geosciences

Álvaro JJ¹  Verraes G¹  Vizcaino D¹  Monceret S¹  Monceret E¹ 

关键词: microbialites;    archaeocyaths;    reefs;    trilobites;    biogeography;    anoxia;    arid belt;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

TheIbero-ArmoricanArcisthemainVariscanmacrostructureinSWEurope.ItsbranchespreservetheCambrianrecordofacontinuousmarginofWestGondwana,fromitssouthwesternedge(WestAsturian-LeoneseandCantabrianzonesandtheirlateralcontinuityintotheIberianChains)toitsnortheasternextension(basementoftheCenozoicAquitainebasin,MontagneNoire,southernCévennes,andSardinia).TheseVariscanrelicsallowthereconstructionofaCambrianEpoch2carbonatebeltthatdevelopedintermittentlyalongWestGondwana.Faciesassociationsshowthatthemaincentresofcarbonateproductivitywerenucleatedinooidalandsandshoals,togetherwithmicrobialandmicrobial-archaeocyathanreefs,developedinhighenergyregimesundersubtropicalaridconditions.Outsidetheinnercarbonatebelt,carbonateproductionwasepisodicandrelatedtodepositionofkerogenousblackshalesandphosphogenesisintheCentralIberianZoneandnorthernpartsofMontagneNoireandCévennes.Developmentofcarbonateplatformsalongthemarginwasdiachronousanddiscontinuous,duetopolewarddriftingandtectonicallyinduceddrowningandflooding.BiogeographicconnectionwithsimilarsubtropicalcarbonateplatformsfromEastGondwana(mainlySouthChina)favouredthemigrationofequatorialandsubtropicaltrilobitegenera,suchasDolerolenus,Eoredlichia,Metaredlichia,Protolenus,Redlichia,andSardaspis.

【 授权许可】

Unknown