Počet záznamů: 1
Palaeoenvironments and facies on a progressively flooded rocky island (Upper Cenomanian – Lower Turonian, Bohemian Cretaceous Basin)
0348551 - GLU-S 2011 RIV CZ eng J - Článek v odborném periodiku
Žítt, Jiří - Vodrážka, R. - Hradecká, L. - Svobodová, Marcela
Palaeoenvironments and facies on a progressively flooded rocky island (Upper Cenomanian – Lower Turonian, Bohemian Cretaceous Basin).
Journal of the National Museum. Roč. 179, - (2010), s. 223-234 ISSN 1802-6842
Výzkumný záměr: CEZ:AV0Z30130516
Klíčová slova: Cretaceous island * weathering * geomorphology * sedimentary environments * biostratigraphy * Upper Cenomanian-Lower Turonian * Bohemian Cretaceous Basin
Kód oboru RIV: DB - Geologie a mineralogie
The first attempt to reconstruct the sedimentary environments on a small Late Cretaceous (Upper Cenomanian - Lower Turonian) rocky island (Plaňany, Bohemian Cretaceous Basin) is presented. The shallow-water, highly variable coarse clastic to sandstone and limestone sedimentation prevailed in the Upper Cenomanian. An erosion event and following condensation interval with mineralization (glauconitization, phosphatization), deposition of the dark grey, Corg. enriched, and later the greenish glauconitic sediments were remarkable during the basal Lower Turonian (Whiteinella archaeocretacea Biozone). All the Lower Turonian strata are relatively fine-grained (claystones, siltstones, marlstones) and evidence the rapid deepening of the sea. During the Helvetoglobotruncana helvetica Biozone, the Plaňany island was deeply submerged and covered by light siltstones. The Early Turonian sea-level rise is well documented by changing microfaunal and macrofaunal (mainly sponge) populations.
Trvalý link: http://hdl.handle.net/11104/0189065