Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform
The sedimentological, stratigraphic, and geochemical signature of the Toarcian Oceanic Anoxic Event (OAE) on the Bahamian-style, Adriatic Carbonate Platform of Southern Europe is examined here. New stratigraphic sections correlated to previously published data show that a healthy and diverse metazoa...
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ftunivtexas:oai:repositories.lib.utexas.edu:2152/61642 2023-05-15T17:51:42+02:00 Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform Ettinger, Nicholas Patrick Martindale, Rowan C Kerans, C. (Charles) 2017-05 application/pdf http://hdl.handle.net/2152/61642 https://doi.org/10.15781/T26D5PS8D en eng doi:10.15781/T26D5PS8D http://hdl.handle.net/2152/61642 Oceanic Anoxic Event Toarcian Chemostratigraphy Geochemistry Stratigraphy Carbonate sedimentology Climate change Thesis text 2017 ftunivtexas https://doi.org/10.15781/T26D5PS8D 2020-12-23T22:20:17Z The sedimentological, stratigraphic, and geochemical signature of the Toarcian Oceanic Anoxic Event (OAE) on the Bahamian-style, Adriatic Carbonate Platform of Southern Europe is examined here. New stratigraphic sections correlated to previously published data show that a healthy and diverse metazoan carbonate factory characterized the flat-topped platform prior to the onset of the OAE. Carbon isotopes of marine organic matter and bulk carbonate, as well as trace element data (V, Ni, Mo, Mn, Hg) were used to identify the stratigraphic location of the OAE on the outer platform. A negative organic carbon isotope excursion of -2.2‰ coincident with enrichments in Mo and Fe was used to correlate to time equivalent strata in both the inner platform and adjacent basin. The onset of the OAE heralded a carbonate factory collapse on the outer platform that was driven by deoxygenation, eutrophication, and possibly ocean acidification. At the same time, a shallow intrashelf basin developed, while the adjacent deep-water basin accumulated black shales. The cessation of carbonate production throughout the OAE yielded a significant drowning unconformity on the outer platform as sea-level continued to rise, while restricted, organic-rich mudstones accumulated on the inner platform under a euxinic regime. Recovery of carbonate production is characterized mainly by calcitic fauna and ooids. By the Middle Jurassic, ooids generated on the outer margin spilled into the adjacent basin forming a thick deep-water oolitic fan, and they prograded to the inner platform, reestablishing a flat-topped carbonate platform. Geological Sciences Thesis Ocean acidification The University of Texas at Austin: Texas ScholarWorks |
institution |
Open Polar |
collection |
The University of Texas at Austin: Texas ScholarWorks |
op_collection_id |
ftunivtexas |
language |
English |
topic |
Oceanic Anoxic Event Toarcian Chemostratigraphy Geochemistry Stratigraphy Carbonate sedimentology Climate change |
spellingShingle |
Oceanic Anoxic Event Toarcian Chemostratigraphy Geochemistry Stratigraphy Carbonate sedimentology Climate change Ettinger, Nicholas Patrick Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform |
topic_facet |
Oceanic Anoxic Event Toarcian Chemostratigraphy Geochemistry Stratigraphy Carbonate sedimentology Climate change |
description |
The sedimentological, stratigraphic, and geochemical signature of the Toarcian Oceanic Anoxic Event (OAE) on the Bahamian-style, Adriatic Carbonate Platform of Southern Europe is examined here. New stratigraphic sections correlated to previously published data show that a healthy and diverse metazoan carbonate factory characterized the flat-topped platform prior to the onset of the OAE. Carbon isotopes of marine organic matter and bulk carbonate, as well as trace element data (V, Ni, Mo, Mn, Hg) were used to identify the stratigraphic location of the OAE on the outer platform. A negative organic carbon isotope excursion of -2.2‰ coincident with enrichments in Mo and Fe was used to correlate to time equivalent strata in both the inner platform and adjacent basin. The onset of the OAE heralded a carbonate factory collapse on the outer platform that was driven by deoxygenation, eutrophication, and possibly ocean acidification. At the same time, a shallow intrashelf basin developed, while the adjacent deep-water basin accumulated black shales. The cessation of carbonate production throughout the OAE yielded a significant drowning unconformity on the outer platform as sea-level continued to rise, while restricted, organic-rich mudstones accumulated on the inner platform under a euxinic regime. Recovery of carbonate production is characterized mainly by calcitic fauna and ooids. By the Middle Jurassic, ooids generated on the outer margin spilled into the adjacent basin forming a thick deep-water oolitic fan, and they prograded to the inner platform, reestablishing a flat-topped carbonate platform. Geological Sciences |
author2 |
Martindale, Rowan C Kerans, C. (Charles) |
format |
Thesis |
author |
Ettinger, Nicholas Patrick |
author_facet |
Ettinger, Nicholas Patrick |
author_sort |
Ettinger, Nicholas Patrick |
title |
Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform |
title_short |
Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform |
title_full |
Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform |
title_fullStr |
Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform |
title_full_unstemmed |
Carbonate platform demise and recovery at the Toarcian Oceanic Anoxic Event : high-resolution data from the Adriatic Carbonate Platform |
title_sort |
carbonate platform demise and recovery at the toarcian oceanic anoxic event : high-resolution data from the adriatic carbonate platform |
publishDate |
2017 |
url |
http://hdl.handle.net/2152/61642 https://doi.org/10.15781/T26D5PS8D |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
doi:10.15781/T26D5PS8D http://hdl.handle.net/2152/61642 |
op_doi |
https://doi.org/10.15781/T26D5PS8D |
_version_ |
1766158926037909504 |