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The Jurassic Cretaceous Boundary in marine sedimentary successions in Turkey: a review
Date
2018-12-07
Author
Yılmaz, İsmail Ömer
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Microfacies and high resolution studies at the Kurovice quarry (Czech Republic, Outer Western Carpathians) on calpionellids, calcareous and non-calcareous dinoflagellate cysts, sporomorphs and calcareous nannofossils, aligned with paleomagnetism, allow construction of a detailed stratigraphy and paleoenvironmental interpretation across the Jurassic/Cretaceous (J/K) boundary. The Kurovice section consists of allodapic and micrite limestones and marlstones. Identified standard microfacies types SMF 2, SMF 3 and SMF 4 indicate that sediments were deposited on a deep shelf margin (FZ 3), with a change, later, into distal basin conditions and sediments (FZ 1). The sequence spans a stratigraphic range from the Early Tithonian calcareous dinoflagellate Malmica Zone, nannoplankton zone NJT 15 and magnetozone M 21r to the late Early Berriasian calpionellid Elliptica Subzone of the Calpionella Zone, nannoplankton NK-1 Zone and M 17r magnetozone. The J/K boundary is marked by a quantitative increase of small forms of Calpionella alpina, the base of the Alpina Subzone (that corresponds to NJT 17b and M 19n.2n) and by the rare occurrence of Nannoconus wintereri. Palynomorphs include Early Berriasian terrestrial elements — non-calcareous dinoflagellate cysts Achomo sphaera neptunii, Prolixosphaeridium sp. A and Tehamadinium evittii. The depositional area for Kurovice was situated at the margin of the NW Tethys. The influence of cold waters from northern latitudes and potential upwellings is highlighted by: 1) the high proportion of radiolarians and sponge spicules, 2) rare calpionellids represented mostly by hyaline forms, 3) the absence of microgranular calpionellids — chitinoidellids, 4) the small percentage of the genera Nannoconus, Polycostella and Conusphaera in nannofossil assemblages, as compared to other sites in Tethys, 5) scarce Nannoconus compressus, which has otherwise been mentioned from the Atlantic area
Subject Keywords
Tithonian
,
Berriasian
,
Calcareous and non-calcareous microfossils
,
Calcareous nannofossils
,
Palynomorphs
,
Magnetostratigraphy
URI
https://hdl.handle.net/11511/73809
DOI
https://doi.org/10.2478/geoca-2019-000
Conference Name
JK2018,( 5 - 07 Aralık 2018)
Collections
Department of Geological Engineering, Conference / Seminar
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İ. Ö. Yılmaz, “The Jurassic Cretaceous Boundary in marine sedimentary successions in Turkey: a review,” presented at the JK2018,( 5 - 07 Aralık 2018), Cenevre, Isviçre, 2018, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/73809.