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The Kara/Ust-Kara twin impact structure; a large-scale impact event in the Late Cretaceous

Christian Koeberl, Virgil L. Sharpton, T. Mark Harrison, David Sandwell, A. V. Murali and Kevin Burke
The Kara/Ust-Kara twin impact structure; a large-scale impact event in the Late Cretaceous (in Global catastrophes in Earth history; an interdisciplinary conference on impacts, volcanism, and mass mortality, Virgil L. Sharpton (editor) and Peter D. Ward (editor))
Special Paper - Geological Society of America (1990) 247: 233-238

Abstract

The Kara impact structure, on the Kara Sea coast of Russia, consists of two adjacent impact craters, the Kara and the Ust-Kara craters. The Kara crater is located on land and has a pre-erosion diameter of about 65 km, whereas the Ust-Kara crater is mostly submarine and has only limited onshore exposure. The diameter of the Ust-Kara crater was earlier suggested to be about 25 km, but recent morphological studies indicate a diameter >70 km. This is not incompatible with Seasat and Geosat data. It has been suggested that the Kara impact event may be associated with the K/T boundary event. Previously reported K-Ar ages showed wide margins of uncertainty and clustered around 60 Ma, while more recent K-Ar determinations seemed to support an association with the K/T boundary. Our own analyses of several (super 40) Ar- (super 39) Ar age spectra, however, indicate an age of >70 Ma for the Kara impact event, perhaps close to the age of the Campanian-Maastrichtian boundary. Even if there is no association with the K/T boundary event, a double impact leading to craters of approximately 65 and 80 km diameter must have been an important geologic event with possible global significance. The record of this large-scale impact event may have been preserved in deep-sea sediment cores.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 247
Title: The Kara/Ust-Kara twin impact structure; a large-scale impact event in the Late Cretaceous
Title: Global catastrophes in Earth history; an interdisciplinary conference on impacts, volcanism, and mass mortality
Author(s): Koeberl, ChristianSharpton, Virgil L.Harrison, T. MarkSandwell, DavidMurali, A. V.Burke, Kevin
Author(s): Sharpton, Virgil L.editor
Author(s): Ward, Peter D.editor
Affiliation: Lunan Planet. Inst., Houston, TX, United States
Affiliation: Lunar and Planet. Inst., Houston, TX, United States
Pages: 233-238
Published: 1990
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Meeting name: Global catastrophes in Earth history; an interdisciplinary conference on impacts, volcanism, and mass mortality
Meeting location: Snowbird, UT, USA, United States
Meeting date: 19881020Oct. 20-23, 1988
References: 40
Accession Number: 1995-026151
Categories: Invertebrate paleontologyExtraterrestrial geology
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N36°00'00" - N82°00'00", W170°00'00" - E20°00'00"
N37°00'00" - N83°00'00", W170°00'00" - E28°00'00"
N68°00'00" - N82°00'00", E55°30'00" - E105°00'00"
Secondary Affiliation: Univ. Wash., USA, United StatesUniv. Calif. at Los Angeles, USA, United StatesScripps Inst. Oceanogr., La Jolla, CA, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199510
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