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Blueschist-bearing metamorphic core complexes in the Qiangtang Block reveal deep crustal structure of northern Tibet

Paul Kapp, An Yin, Craig E. Manning, Mike Murphy, T. Mark Harrison, Matthew Spurlin, Ding Lin, Deng Xiguang and Wu Cun-Ming
Blueschist-bearing metamorphic core complexes in the Qiangtang Block reveal deep crustal structure of northern Tibet
Geology (Boulder) (January 2000) 28 (1): 19-22

Abstract

A 500-km-long belt of metamorphic exposures in the Qiangtang block provides an opportunity to study the internal structure of northern Tibetan crust. Metamorphic rocks exposed at two widely separated areas along this belt consist of blueschist-bearing melange and are bounded by Late Triassic-Early Jurassic, domal, low-angle normal faults. We propose that this melange was underplated to the Qiangtang block and was subsequently exhumed by detachment faulting; both the underplating and the exhumation occurred during early Mesozoic southward subduction of oceanic lithosphere along the Jinsha suture. This model predicts that the deeper crust of much of northern Tibet consists of accretionary melange, in contrast to the continental crystalline crust of southern Tibet, and may account for north-south variations of Cenozoic tectonism in Tibet.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 28
Serial Issue: 1
Title: Blueschist-bearing metamorphic core complexes in the Qiangtang Block reveal deep crustal structure of northern Tibet
Affiliation: University of California at Los Angeles, Department of Earth and Space Sciences, Los Angeles, CA, United States
Pages: 19-22
Published: 200001
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 2000-018568
Categories: Solid-earth geophysicsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diag., sects., geol. sketch maps
N32°19'60" - N35°00'00", E85°00'00" - E93°00'00"
N27°00'00" - N37°00'00", E79°00'00" - E99°00'00"
Secondary Affiliation: Academia Sinica, Beijing, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200006
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