Sedimentary record of subaerial volcanic activity in the basal Ordovician shoal-marine deposits: the Třenice Formation of the Prague Basin, Bohemian Massif, Czech Republic

Bulletin of geosciences

Kraft P¹  Rajchl M¹  Rapprich V¹  Hroch T¹ 

关键词: Prague Basin;    shoal-marine sediments;    volcaniclastics;    Ordovician;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

ThebasalOrdovicianTřeniceFormationrepresentsaninitialunitofthepreservedinfillofthePragueBasin.Volcanicadmixtureinsedimentspreservedinthesouth-westernpartofthebasinsuggestssubaerialvolcanicactivityduringthedepositionoftheTřeniceFormation.ThreeprincipallithofaciesassociationsweredefinedwithinsedimentaryrecordoftheTřeniceFormationbasedonpetrographyandobservedsedimentarystructures:i)gradedconglomerates,ii)lithicsandstonesandiii)volcanigenicdeposits.Thestudiedsedimentsweremostlydepositedassubtidalsanddunes,locallyinterbeddedwithvolcaniclasticrocks.Theyareconsidereddepositsofamarinelowershorefaceinfluencedbyebb-tidecurrents.VolcaniclasticintercalationsareinterpretedasdepositsofdebrisflowsandturbiditycurrentsthatredepositedvolcaniclasticmaterialderivedfromsubaerialKřivoklát-RokycanyandStrašicevolcaniccomplexes.

【 授权许可】

Unknown