globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.01.031
论文题名:
The Barremian and Aptian stepwise development of the 'Oceanic Anoxic Event 1a' (OAE 1a) crisis: Integrated benthic and planktic high-resolution palaeoecology along the Gorgo a Cerbara stratotype section (Umbria-Marche Basin, Italy)
作者: Patruno S.; Triantaphyllou M.V.; Erba E.; Dimiza M.D.; Bottini C.; Kaminski M.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 424
起始页码: 147
结束页码: 182
语种: 英语
英文关键词: Anoxia ; Benthic foraminifera ; Carbon flux ; Hedbergella trocoidea ; OAE 1a ; Selli
英文摘要: The Barremian and Aptian were times of global plate reconfiguration and profound changes in the ocean-climate system, culminating in the worldwide deposition of lower Aptian black shale layers (OAE 1a). Based on high-resolution lithostratigraphic and micropaleontological analyses, precursor conditions and timing of the anoxia are here reconstructed along a 33.06. m thick section in the proposed Barremian/Aptian boundary GSSP stratotype at Gorgo a Cerbara (Umbria-Marche Basin, Italy).A non-uniform history of benthic foraminiferal diversification is interrupted by the Selli Level (= OAE 1a) and by three turnover points for both benthic and planktic organisms, each highlighted by prominent breaks in lithology and outcrop morphology. The first two points, at ~. 1.1. Myr and ~. 20-50. kyr prior to the onset of the OAE 1a, correspond respectively to the nannoconid (=. bathypelagic calcareous nannofossils) 'decline' and 'crisis' events, and separate: (a) pelagic limestone/chert-claystone lithological cycles of the uppermost Maiolica Formation, showing frequencies reminiscent of orbital eccentricity and containing an oligotrophic Barremian benthic and planktic assemblage, dominated by k-selected nannoconids and Rhizammina; (b) greenish-grey cherty marls of the lowermost Marne a Fucoidi Formation, associated to declining sedimentation rates and eutrophic early Aptian assemblages dominated by radiolarians and lituolid benthic foraminifera; and (c) anoxic radiolarites and shales of the carbonate-free Selli Level. High magnitude and frequency assemblage fluctuations occur between the nannoconid crisis (~. 25. cm below the lowermost OAE 1a black shale layer) and the Selli Level base, with suggestions of bottom-water acidification. At ~. 800. kyr after the OAE 1a end, a third turnover point in the basal reddish member of the Marne a Fucoidi highlights 'middle' Aptian assemblages characterized by a bloom of early macroperforate planktic foraminifera (. Hedbergella spp.) and appearances of new benthic species, marking a shift towards better oxygenation.OAE 1a oxygen and pelagic carbonate factory crises are here suggested to have been step-wise and linked to global warming conditions. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68996
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作者单位: Petroleum Geo-Services (PGS), 4 The Heights, Brooklands, Weybridge, Surrey, United Kingdom; Department of Earth Science and Engineering, Imperial College, London, United Kingdom; Faculty of Geology and Geoenvironment, University of Athens, Panepistimiopolis, Athens, Greece; Dipartimento di Scienze della Terra Ardito Desio, Università degli Studi di Milano, Mangiagalli 34, Milano, Italy; Earth Sciences Department, Reservoir Characterization Group, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia; Department of Earth Science, University College London, Gower Street, London, United Kingdom

Recommended Citation:
Patruno S.,Triantaphyllou M.V.,Erba E.,et al. The Barremian and Aptian stepwise development of the 'Oceanic Anoxic Event 1a' (OAE 1a) crisis: Integrated benthic and planktic high-resolution palaeoecology along the Gorgo a Cerbara stratotype section (Umbria-Marche Basin, Italy)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,424
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