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Subsidence of the West Siberian Basin; effects of a mantle plume impact

Peter J. Holt, Jeroen van Hunen and Mark B. Allen
Subsidence of the West Siberian Basin; effects of a mantle plume impact
Geology (Boulder) (June 2012) 40 (8): 703-706

Abstract

Comparison of modeling results with observed subsidence patterns from the West Siberian Basin provides new insight into the origin of the Siberian Traps, and constrains the temperature, size, and depth of an impacting mantle plume head during and after the eruption of the Siberian Traps at the Permian-Triassic boundary (250 Ma). We compare subsidence patterns from one-dimensional conductive heat flow models to observed subsidence from backstripping studies of wells in the basin. This results in a best-fit scenario with a 50-km-thick initial plume head with a temperature of 1500 degrees C situated 50 km below the surface, and an initial regional crustal thickness of 34 km, in agreement with published values. Backstripping and modeling results agree very well, including a 60-90 m.y. delay between the rifting phase and the first regional sedimentation. Regional subsidence patterns indicate that the plume head was present across a minimum area of approximately 2.5X10 (super 6) km (super 2) . These results re-emphasize the viability of a mantle plume origin for the Siberian Traps, provide important constraints on the dynamics of mantle plume heads, and suggest a thermal control for the subsidence of the West Siberian Basin.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 40
Serial Issue: 8
Title: Subsidence of the West Siberian Basin; effects of a mantle plume impact
Affiliation: Durham University, Geospatial Research, Durham, United Kingdom
Pages: 703-706
Published: 20120615
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 2012-065557
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2012196; accessed on July 2, 2012
Illustration Description: illus. incl. sketch map
Source Medium: WWW
N50°00'00" - N73°30'00", E62°00'00" - E95°00'00"
N37°00'00" - N83°00'00", W170°00'00" - E28°00'00"
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: 201234
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