Book
Millennial physical events and the end-Permian mass mortality in the western Palaeotethys: timing and primary causes.
| العنوان: | Millennial physical events and the end-Permian mass mortality in the western Palaeotethys: timing and primary causes. |
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| المؤلفون: | FARABEGOLI, ENZO, PERRI, MARIA CRISTINA |
| المساهمون: | Talent John Alfred, Farabegoli E., Perri M.C. |
| بيانات النشر: | Springer Science +Business Media B.V.2012 NLD Dordrecht |
| سنة النشر: | 2012 |
| المجموعة: | IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
| مصطلحات موضوعية: | Permian, Triassic, Palaeotethy, Gondwana, Dolomite, Shelf environment, Highstand, Cyclicity, Mass mortality |
| الوصف: | This chapter focuses on the nature and pattern of four transgressive–regressive depositional cycles (C1–C4) across the Permian–Triassic Boundary (PTB) in the Dolomites, on their timing and on the possible causal relationships with four massmortality events (E0–E3), which, considered together, constitute the end-Permian extinction event in the western Palaeotethys. The duration of the investigated interval is ca. 200 ky; the duration of each cycle ranged from less than 20 ky to ca. 100 ky; and the magnitude of the sea level changes ranged from 5 to 15 m. Each mass-mortality event affecting the shallow marine environments of the western Palaeotethys corresponds with a regressive phase lasting a few millennia. The oldest mortality event (E0) at the top of Cycle 1 (i.e., the top of the Ostracod Unit) in the Southern Alps is aligned with the regressive Bed 24e of the Meishan D section in the eastern Palaeotethys; it is usually considered the actual end-Permian extinction event. The same cooling/fall-stand has been identified in various sites along the shallow-marine Gondwana margin. In the Southern Alps, E0 is mostly masked by stressed conditions typical of the regional carbonate tidal flat. During the following transgression and high-stand periods of Cycle 2 (i.e., Bulla Member), the shallow marine environment became re-populated by ca. 200 species referred to ca. 30 genera. At the top of Cycle 2, the sea level fell 10 m or less in a few millennia; it started the most devastating mass-mortality event (E1) in the Southern Alps. This mortality event lasted less than 20 millennia; it continued briefly during the trangressive phase of the following Cycle 3—which brackets the Bellerophon-Werfen formational boundary (BWB). This interval, aligned with Beds 26–27a at Meishan in the eastern Palaeotethys, was deposited in a deeper and distal environment. About 90% of the marine skeletal biomass disappeared at the end of E1. The acme of mortality event, E1, corresponded with a submarine chemical-corrosion event, followed ... |
| نوع الوثيقة: | book part |
| وصف الملف: | STAMPA |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/isbn/9789048134274; ispartofbook:Earth and Life, Extinction Intervals and Biogeographic Perturbations through Time, International Year of Planet Earth.; firstpage:719; lastpage:758; numberofpages:40; alleditors:Talent John Alfred; http://hdl.handle.net/11585/140599; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84885447894 |
| DOI: | 10.1007/978-90-481-3428-1_24 |
| الاتاحة: | http://hdl.handle.net/11585/140599 https://doi.org/10.1007/978-90-481-3428-1_24 |
| رقم الانضمام: | edsbas.2D0E18CF |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/978-90-481-3428-1_24 |
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