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dc.contributor.author
Franceschi, Marco
dc.contributor.author
Dal Corso, Jacopo
dc.contributor.author
Cobianchi, Miriam
dc.contributor.author
Roghi, Guido
dc.contributor.author
Penasa, Luca
dc.contributor.author
Picotti, Vincenzo
dc.contributor.author
Preto, Nereo
dc.date.accessioned
2020-01-29T06:58:58Z
dc.date.available
2020-01-28T15:25:50Z
dc.date.available
2020-01-29T06:58:58Z
dc.date.issued
2019
dc.identifier.issn
0016-7606
dc.identifier.issn
1943-2674
dc.identifier.other
10.1130/b31765.1
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/395044
dc.description.abstract
Early Jurassic shallow water carbonate environments of Tethys experienced important changes in a context of rifting that climaxed with the final break-up of Pangea. This time was also characterized by major perturbations of the global carbon cycle, some of which likely linked to the emplacement of large igneous provinces. At the Sinemurian- Pliensbachian (Early Jurassic) transition a globally recognized carbon isotope perturbation named "S-P Event" was found. In the western Tethys, this coincided with important architectural changes in the carbonate platforms which switched from peritidal flats to subtidal rimmed lagoons. A similar evolution in carbonate systems was observed during the Carnian Pluvial Episode (Late Triassic) when a global carbon isotope perturbation coincided with the demise of microbial carbonate platforms in the Tethys. In this paper, new carbonate and organic carbon isotope records and quantitative petrography data (modal analysis) from the deep- and shallow-water Sinemurian- Pliensbachian sedimentary successions exposed in the central Southern Alps of Italy are presented. Data show that across two negative carbon isotope excursions the carbonate factory abruptly changed and a drop in the microbial fraction of the carbonate occurred. This suggests that environmental modifications associated with these isotope excursions impacted the type of carbonate production and were a key-factor in determining the evolution of Tethyan carbonate platforms. New results and a comparison between the S-P Event and the Carnian Pluvial Episode highlight striking commonalities and imply that the demise of microbial carbonate systems coincident to isotope perturbations is not an isolated event in geologic history. Microbialites, therefore, do not necessarily represent "crisis facies" following extinction events. Rather, their development or demise appears linked to yet poorly understood mechanisms governing the interaction between global climate changes and shallow-water carbonate sedimentation.
en_US
dc.language.iso
en
en_US
dc.publisher
Geological Society of America
en_US
dc.subject
Climate Change
en_US
dc.subject
Isotopes
en_US
dc.subject
Modal analysis
en_US
dc.subject
Organic carbon
en_US
dc.subject
Carbonate platform
en_US
dc.subject
microbial carbonate
en_US
dc.title
Tethyan carbonate platform transformations during the Early Jurassic (Sinemurian–Pliensbachian, Southern Alps): Comparison with the Late Triassic Carnian Pluvial Episode
en_US
dc.type
Journal Article
dc.date.published
2019-02-06
ethz.journal.title
GSA Bulletin
ethz.journal.volume
131
en_US
ethz.journal.issue
7-8
en_US
ethz.journal.abbreviated
Geol. Soc. Am. Bull.
ethz.pages.start
1255
en_US
ethz.pages.end
1275
en_US
ethz.size
21 p.
en_US
ethz.publication.place
McLean, VA
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03754 - Willett, Sean / Willett, Sean
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02704 - Geologisches Institut / Geological Institute::03754 - Willett, Sean / Willett, Sean
en_US
ethz.date.deposited
2020-01-28T15:25:57Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2020-01-29T06:59:08Z
ethz.rosetta.lastUpdated
2022-03-29T00:52:18Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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