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Anoxic events in the late Frasnian; causes of the Frasnian-Famennian faunal crisis?

Michael M. Joachimski and Werner Buggisch
Anoxic events in the late Frasnian; causes of the Frasnian-Famennian faunal crisis?
Geology (Boulder) (August 1993) 21 (8): 675-678

Abstract

Carbon isotope data collected from five Frasnian-Famennian boundary sections in central Europe show two positive delta (super 13) C excursions in the late Frasnian ( approximately 367 Ma). Both anomalies coincided with the deposition of the bituminous lower and upper Kellwasser horizons. The carbon isotope patterns indicate two phases of enhanced burial and subsequent recycling of organic carbon. A maximum formation of warm saline waters on the subtropical to tropical epicontinental shelves during late Frasnian transgressive episodes may have induced oceanic oxygen deficits. Variations in the C (sub org) burial rates may have resulted in changes in the CO (sub 2) concentrations in the oceans and in the atmosphere, culminating in global climatic changes. We propose that the repeated co-occurrences of sea-level fluctuations, anoxic conditions, and global climatic changes during the late Frasnian would affect especially the subtropical to tropical shallow-water communities and reef ecosystems, which were severely affected during the Frasnian-Famennian faunal crisis.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 21
Serial Issue: 8
Title: Anoxic events in the late Frasnian; causes of the Frasnian-Famennian faunal crisis?
Affiliation: University of Erlangen, Department of Geology, Erlangen, Federal Republic of Germany
Pages: 675-678
Published: 199308
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 27
Accession Number: 1993-027342
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: strat. cols., sketch maps
N45°30'00" - N55°00'00", E06°00'00" - E24°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1993
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