Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors
Integrated biostratigraphic-chemostratigraphic studies provide evidence that the proto-North Atlantic realm witnessed major changes in carbonate platform production in the run-up of the Early Aptian oceanic anoxic event (OAE) 1a. Whereas pervasive growth of Lithocodium microencrusters represents an...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:37427 2023-05-15T17:31:36+02:00 Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors Huck, Stefan Stein, Melody Immenhauser, Adrian Skelton, Peter W. Christ, Nicolas Foellmi, Karl B. Heimhofer, Ulrich 2014 https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37427 https://doi.org/10.1016/j.sedgeo.2014.08.003 eng eng https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37427 https://doi.org/10.1016/j.sedgeo.2014.08.003 info:eu-repo/semantics/closedAccess Institut für Geowissenschaften article doc-type:article 2014 ftubpotsdam https://doi.org/10.1016/j.sedgeo.2014.08.003 2022-07-28T20:46:23Z Integrated biostratigraphic-chemostratigraphic studies provide evidence that the proto-North Atlantic realm witnessed major changes in carbonate platform production in the run-up of the Early Aptian oceanic anoxic event (OAE) 1a. Whereas pervasive growth of Lithocodium microencrusters represents an early harbinger of OAE1a-related environmental perturbation, the subsequent replacement of oligotrophic rudist-coral-nerineid by mesotrophic orbitolinid-oyster communities was clearly associated with the event itself. In order to test the supra-regional relevance of this major community replacement, two shallow-water sections in the southern Lusitanian Basin (Portugal) are investigated by means of geochemistry (carbon and oxygen isotopes), cement petrography and detailed sedimentological analysis. The focus is on a regional, prominent discontinuity surface (S4) at the transition between oligotrophic and mesotrophic carbonate platform production, which might indicate that the major biotic change could have been associated with a phase of non-sedimentation and possibly erosion. The studied sections (Sao Julia, Crismina) provide evidence that the major Early Aptian biotic turnover was preceded by numerous subordinate but significant changes in platform ecology, which mirrored a series of progressive short-term environmental changes in the course of OAE1. Several transient mass occurrences of orbitolinids indicate repeated phases of ecological stress arguably due to enhanced nutrient input and deepening. Small-scale sea-level changes at parasequence level below the major discontinuity surface are revealed by alternations of rudist assemblages dominated by clinger or recumbent forms as well as intercalated hardground and subaerial exposure stages. Expanded phases of subaerial exposure, however, can be largely ruled out following the geochemical and cement-petrographic data presented here. Enhanced continent-derived siliciclastic input characterising the lower orbitolinid-oyster dominated limestones is in support of a shift ... Article in Journal/Newspaper North Atlantic University of Potsdam: publish.UP Sedimentary Geology 313 15 31 |
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Open Polar |
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University of Potsdam: publish.UP |
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ftubpotsdam |
language |
English |
topic |
Institut für Geowissenschaften |
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Institut für Geowissenschaften Huck, Stefan Stein, Melody Immenhauser, Adrian Skelton, Peter W. Christ, Nicolas Foellmi, Karl B. Heimhofer, Ulrich Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors |
topic_facet |
Institut für Geowissenschaften |
description |
Integrated biostratigraphic-chemostratigraphic studies provide evidence that the proto-North Atlantic realm witnessed major changes in carbonate platform production in the run-up of the Early Aptian oceanic anoxic event (OAE) 1a. Whereas pervasive growth of Lithocodium microencrusters represents an early harbinger of OAE1a-related environmental perturbation, the subsequent replacement of oligotrophic rudist-coral-nerineid by mesotrophic orbitolinid-oyster communities was clearly associated with the event itself. In order to test the supra-regional relevance of this major community replacement, two shallow-water sections in the southern Lusitanian Basin (Portugal) are investigated by means of geochemistry (carbon and oxygen isotopes), cement petrography and detailed sedimentological analysis. The focus is on a regional, prominent discontinuity surface (S4) at the transition between oligotrophic and mesotrophic carbonate platform production, which might indicate that the major biotic change could have been associated with a phase of non-sedimentation and possibly erosion. The studied sections (Sao Julia, Crismina) provide evidence that the major Early Aptian biotic turnover was preceded by numerous subordinate but significant changes in platform ecology, which mirrored a series of progressive short-term environmental changes in the course of OAE1. Several transient mass occurrences of orbitolinids indicate repeated phases of ecological stress arguably due to enhanced nutrient input and deepening. Small-scale sea-level changes at parasequence level below the major discontinuity surface are revealed by alternations of rudist assemblages dominated by clinger or recumbent forms as well as intercalated hardground and subaerial exposure stages. Expanded phases of subaerial exposure, however, can be largely ruled out following the geochemical and cement-petrographic data presented here. Enhanced continent-derived siliciclastic input characterising the lower orbitolinid-oyster dominated limestones is in support of a shift ... |
format |
Article in Journal/Newspaper |
author |
Huck, Stefan Stein, Melody Immenhauser, Adrian Skelton, Peter W. Christ, Nicolas Foellmi, Karl B. Heimhofer, Ulrich |
author_facet |
Huck, Stefan Stein, Melody Immenhauser, Adrian Skelton, Peter W. Christ, Nicolas Foellmi, Karl B. Heimhofer, Ulrich |
author_sort |
Huck, Stefan |
title |
Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors |
title_short |
Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors |
title_full |
Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors |
title_fullStr |
Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors |
title_full_unstemmed |
Response of proto-North Atlantic carbonate-platform ecosystems to OAE1a-related stressors |
title_sort |
response of proto-north atlantic carbonate-platform ecosystems to oae1a-related stressors |
publishDate |
2014 |
url |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37427 https://doi.org/10.1016/j.sedgeo.2014.08.003 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://publishup.uni-potsdam.de/opus4-ubp/frontdoor/index/index/docId/37427 https://doi.org/10.1016/j.sedgeo.2014.08.003 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.sedgeo.2014.08.003 |
container_title |
Sedimentary Geology |
container_volume |
313 |
container_start_page |
15 |
op_container_end_page |
31 |
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1766129271036706816 |