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Megafloral perturbation across the Enna marine zone in the Upper Silesian Basin attests to Late Mississippian (Serpukhovian) deglaciation and climate change

Robert A. Gastaldo, Eva Purkynova and Zbynek Simunek
Megafloral perturbation across the Enna marine zone in the Upper Silesian Basin attests to Late Mississippian (Serpukhovian) deglaciation and climate change
Palaios (June 2009) 24 (6): 351-366

Abstract

A significant vegetational change occurs in the Late Mississippian (Serpukhovian, Namurian A) across the Enna Marine Zone (EMZ), Upper Silesian Basin, Czech Republic. All plant clades were impacted, including both spore-producing and seed-producing taxa; wetland taxa were unaffected. Similar vegetational responses are not identified elsewhere although, basinwide, thick marine zones (e.g., Barbora Marine Zone, BMZ) also developed at various times during the Serpukhovian. Examination of sedimentological and petrophysical (gamma-ray log) trends in both marine zones indicates that different mechanisms generated accommodation space during each interval. Placed in a genetic stratigraphic context, the EMZ records sedimentation in at least four (or more) genetic sequences, each equal in duration to individual 100-kyr cyclothems identified in the coalfield. Discrete maximum flooding surfaces (MFSs) with associated condensed sections and macrofaunas are prominent in distal areas and were identified using gamma-ray log responses. In contrast, the petrophysical expression of distal regions of the BMZ shows no strong positive gamma-log excursions interpreted as MFSs. Rather, this interval is a succession equal in duration to two cyclothems. The BMZ represents sedimentation in a glacial-interglacial cyclothemic framework; in contrast, the EMZ represents accumulation under continued eustatic sea-level rise in response to southern hemisphere deglaciation and global warming. Late Mississippian vegetational response to paleoequatorial climate change is interpreted to represent a shift toward greater seasonality, with an increased number of dry months (monsoonal rainfall pattern?) resulting in statistically significant extinction or extirpation several million years prior to the onset of maximum glaciation and sea-level drawdown at the Mississippian-Pennsylvanian boundary.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 24
Serial Issue: 6
Title: Megafloral perturbation across the Enna marine zone in the Upper Silesian Basin attests to Late Mississippian (Serpukhovian) deglaciation and climate change
Affiliation: Colby College, Department of Geology, Waterville, ME, United States
Pages: 351-366
Published: 200906
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 111
Accession Number: 2009-064972
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF grants INT-9513189, EAR-0207359, and EAR-0207848
Illustration Description: illus. incl. strat. cols., 2 tables, geol. sketch maps
N49°31'60" - N49°51'00", E18°11'60" - E18°33'00"
Secondary Affiliation: Silesian Regional Museum, CZE, Czech RepublicCzech Geological Survey, CZE, Czech Republic
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200935
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