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Renewed late Miocene (<8 Ma) hinterland ductile thrusting, western Nepal Himalaya


We report 8 Ma zircon rim ages from a kyanite-bearing leucocratic pod within the lower metamorphic core of the Himalayan orogen in western Nepal. Zircon cores yield ca. 1.84 Ga ages, interpreted to be inherited igneous cores, consistent with the sample's structural position and a Paleoproterozoic source. The pod is boudinaged and hosted in a pervasively top-to-the-south sheared pelitic schist; the 8 Ma zircon rim ages therefore provide a maximum age constraint on recent shear deformation. This late Miocene shearing is inferred to be associated with renewed thrusting in the hinterland of the western Nepal Himalaya, coeval with thrusting and erosion of Lesser Himalayan sequence rocks in the foreland. Hinterland ductile deformation at < or =8 Ma was followed by cooling below 350 degrees C at 6 Ma. This rapid transition from ductile thrusting to exhumation highlights the need for high-resolution geochronology to resolve deformation episodes in orogenic systems.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 46
Serial Issue: 6
Title: Renewed late Miocene (<8 Ma) hinterland ductile thrusting, western Nepal Himalaya
Affiliation: Queen's University, Department of Geological Sciences and Geological Engineering, Kinston, ON, Canada
Pages: 503-506
Published: 20180406
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 2018-037270
Categories: Structural geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2018165
Illustration Description: illus. incl. geol. sketch map
N20°00'00" - N30°00'00", E82°00'00" - E83°00'00"
Secondary Affiliation: University of California at Santa Barbara, USA, United StatesUniversity of Waterloo, CAN, Canada
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, 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: 201820
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