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Sedimentary basins in transition; distribution and tectonic settings of Mesozoic strata in Mongolia

Cari L. Johnson
Sedimentary basins in transition; distribution and tectonic settings of Mesozoic strata in Mongolia (in Late Jurassic margin of Laurasia; a record of faulting accommodating plate rotation, Thomas H. Anderson (editor), Alexei N. Didenko (editor), Cari L. Johnson (editor), Alexander I. Khanchuk (editor) and James H. MacDonald (editor))
Special Paper - Geological Society of America (August 2015) 513: 543-560

Abstract

The Late Jurassic geologic record in Mongolia is poorly known, partly due to only sparsely preserved outcrops, but also because of the region's remoteness and limited body of published geological data compared to China and other parts of Eurasia. Considered in the broader context of Mesozoic sedimentary basin dynamics, the Late Jurassic record that has been studied is both informative and perplexing. Late Jurassic sedimentary basins are preserved in the subsurface throughout the country, and they are partially exposed (along with their igneous and metamorphic counterparts) where they have been inverted by Cretaceous-Cenozoic faulting. However, the speculated geodynamic settings for these basins are poorly reconciled: Various reconstructions place the basins between regions of contrasting tectonic styles in the late Mesozoic (contraction to the southwest and extension to the east/southeast). It is suggested that much of Mongolia represented a large-scale accommodation zone beginning in the early Mesozoic and continuing into at least Late Jurassic time. This scenario may have been expressed within an overall strike-slip framework that includes long-term reactivation structures, some of which are still active today. Although speculative, the hypothesis helps to explain evidence for differential rotation between Mongolia and surrounding blocks in the late Mesozoic, and it is testable pending additional field and analytical data. In particular, additional information is needed regarding the timing and modes of Mongol-Okhotsk Ocean closure and suturing. Current interpretations place final ocean closure and suturing in Mongolia anywhere from Permian to Cretaceous, with differing implications for collisional mechanisms and geologic expressions.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 513
Title: Sedimentary basins in transition; distribution and tectonic settings of Mesozoic strata in Mongolia
Title: Late Jurassic margin of Laurasia; a record of faulting accommodating plate rotation
Author(s): Johnson, Cari L.
Author(s): Anderson, Thomas H.editor
Author(s): Didenko, Alexei N.editor
Author(s): Johnson, Cari L.editor
Author(s): Khanchuk, Alexander I.editor
Author(s): MacDonald, James H.editor
Affiliation: University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United States
Pages: 543-560
Published: 20150828
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Number of pages: 18
References: 117
Accession Number: 2015-099251
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
N42°00'00" - N52°00'00", E87°00'00" - E120°00'00"
Source Note: Online First
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201542
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