Badenian-Sarmatian chronostratigraphy in the Polish Carpathian Foredeep

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• 作者：Maciej 艢liwi艅ski^a ; ^{mgsliwinski@alaska.edu} ; Maciej B膮bel^b ; ^{m.babel@uw.edu.pl} ; Krzysztof Nejbert^b ; ^{knejbert@uw.edu.pl} ; Danuta Olszewska-Nejbert^b ; ^{don@uw.edu.pl} ; Andrzej G膮siewicz^c ; ^{agas@pgi.gov.pl} ; B. Charlotte Schreiber^d ; ^{geologo1@u.washington.edu} ; Jeff A. Benowitz^a ; ^{jeffapplebenowitz@yahoo.com} ; Paul Layer^a ; ^{pwlayer@alaska.edu}
• 关键词：Badenian Salinity Crisis ; Badenian&ndash ; Sarmatian boundary ; 40Ar/39Ar geochronology ; Pecten Beds ; Carpathian Foredeep ; Paratethys
• 刊名：Palaeogeography ; Palaeoclimatology ; Palaeoecology
• 出版年：2012
• 期刊代码：68_00310182
• 类别：ear
• 出版时间：1 April, 2012
• 卷：326-328
• 期：Complete
• 页码：12-29
• 文件大小：3231 K

摘要

The Miocene of the northern part of the Polish Carpathian Foredeep contains a record of events particularly important in the evolution of the Central Paratethys Basin. There, the Paratethyan Badenian Salinity Crisis resulted in the deposition of evaporite gypsum deposits of the Krzy偶anowice Formation. The ensuing post-evaporite marine Badenian deposition is recorded by the marly Pecten Beds. The transition to the overlying clays of the Syndesmya Beds represents the initial deterioration of normal marine conditions within the basin, and is associated with the disappearance of typical stenohaline faunal components during the Badenian-Sarmatian Extinction Event, and the subsequent appearance of endemic Sarmatian taxa. The history of these Paratethyan events has hitherto been only poorly dated. New ⁴⁰Ar/³⁹Ar dating of biotite and volcanic glass from a rhyolite tuff within the Pecten Beds (Babczyn-2 core) constrains its depositional age to 13.06 卤 0.11 Ma. This age suggests that the faunal extinction presumably took place after 13.06 卤 0.11 Ma, and that the salinity crisis ended before then. This result is consistent with other reliable radiometric age constraints that collectively suggest that the crisis began shortly after 13.81 卤 0.08 Ma (), and that evaporite deposition took place ca. 13.60 卤 0.07 Ma (). Both the Badenian evaporites and the Pecten Beds in Carpathian Foredeep are thus Serravallian in age and represent the lower part of Neogene Nannoplankton Zone 6 (NN 6).