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U-Pb zircon ages from the southwestern Karoo Basin, South Africa; implications for the Permian-Triassic boundary

Andrea Fildani, Amy Weislogel, Nicholas J. Drinkwater, Tim McHargue, Anthony Tankard, Joe Wooden, David Hodgson and Stephen Flint
U-Pb zircon ages from the southwestern Karoo Basin, South Africa; implications for the Permian-Triassic boundary
Geology (Boulder) (August 2009) 37 (8): 719-722

Abstract

U-Pb ages determined using sensitive high-resolution ion microprobe-reverse geometry on 205 single-grain zircons from 16 ash beds within submarine fan deposits of the Ecca Group provide the first evidence of a marine Permian-Triassic (P-T) boundary in the Karoo Basin of South Africa. These U-Pb ages provide an objective basis for correlating the deep-marine sediments of the southwest Karoo Basin with fluvial-deltaic deposits in the central and eastern parts of the basin where the P-T boundary is recorded in a diverse macrofauna. Furthermore, these new zircon ages and their correlation imply asymmetric subsidence and variable sedimentation rates across the basin.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 8
Title: U-Pb zircon ages from the southwestern Karoo Basin, South Africa; implications for the Permian-Triassic boundary
Affiliation: Chevron Energy Technology Company, San Ramon, CA, United States
Pages: 719-722
Published: 200908
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 25
Accession Number: 2009-072364
Categories: Geochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009173
Illustration Description: illus. incl. geol. sketch map
S29°00'00" - S29°00'00", E19°00'00" - E22°00'00"
Secondary Affiliation: University of Alabama, USA, United StatesChevron Southern African Business Unit, USA, United StatesStanford-U. S. Geological Survey Micro-Analysis Center, USA, United StatesUniversity of Liverpool, GBR, United Kingdom
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 the Geological Society of America, Boulder, CO, United States
Update Code: 200939
Program Name: USGSOPNon-USGS publications with USGS authors
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