Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Cenozoic exhumation and deformation of northeastern Tibet and the Qinling; is Tibetan lower crustal flow diverging around the Sichuan Basin?

Eva Enkelmann, Lothar Ratschbacher, Raymond Jonckheere, Ralf Nestler, Manja Fleischer, Richard Gloaguen, Bradley R. Hacker, Zhang Yueqiao and Ma Yinsheng
Cenozoic exhumation and deformation of northeastern Tibet and the Qinling; is Tibetan lower crustal flow diverging around the Sichuan Basin?
Geological Society of America Bulletin (June 2006) 118 (5-6): 651-671

Abstract

Apatite fission-track thermochronology data elucidate the cooling/exhumation history of the Qinling (Qin Mountains), which contain a Paleozoic-Mesozoic orogenic collage north of the Sichuan Basin and northeast of the Tibetan Plateau. In particular, we examine the extent to which the Qinling were affected by the rising plateau. The northern and eastern Qinling show continuous cooling and slow exhumation since the Cretaceous. In contrast, in the southwestern Qinling, rapid cooling initiated at 9-4 Ma, a few million years later than in the eastern Tibetan Plateau. A compilation of major Cenozoic faults in the eastern Tibetan Plateau and the Qinling, and their kinematic and dynamic characterization, shows that deformation in the Qinling has predominantly been strike slip. Active sinistral and dextral strike-slip faults delineate an area of eastward rock flow and bound the area of rapid late Cenozoic cooling outlined by apatite fission-track thermochronology. These data can be interpreted to indicate that lower crustal flow has been diverted around the Longmen Shan and beneath the southwestern Qinling, causing active plateau uplift in this area. Alternatively, northeastern Tibet may be growing eastward faster in the western Qinling than the entire South China Block is extruding to the east.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 118
Serial Issue: 5-6
Title: Cenozoic exhumation and deformation of northeastern Tibet and the Qinling; is Tibetan lower crustal flow diverging around the Sichuan Basin?
Affiliation: Technische Universitaet Bergakademie, Geowissenschaften, Freiberg, Federal Republic of Germany
Pages: 651-671
Published: 200606
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 94
Accession Number: 2006-045328
Categories: Structural geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With appendices
Illustration Description: illus. incl. block diags., 5 tables, geol. sketch maps
N31°30'00" - N35°00'00", E104°00'00" - E110°00'00"
Secondary Affiliation: University of California at Santa Barbara, USA, United StatesChinese Academy of Geological Sciences, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200613
Close Modal

or Create an Account

Close Modal
Close Modal