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Tibetan garnet records early Eocene initiation of thickening in the Himalaya

Matthijs A. Smit, Bradley R. Hacker and Jeffrey Lee
Tibetan garnet records early Eocene initiation of thickening in the Himalaya
Geology (Boulder) (May 2014) 42 (7): 591-594


Tectonic reconstructions of the Himalayan orogeny depend on the age at which crustal thickening commenced. To investigate this age, we analyzed garnet from middle crustal rocks exposed in the north Himalayan Mabja and Kangmar gneiss domes of Tibet using Lu-Hf geochronology. Garnet yielded Lu-Hf ages of 54-52 Ma in Mabja and 51-49 Ma in Kangmar samples. On the basis of microstructural and major element and rare earth element zoning observations, the Lu-Hf ages are interpreted as recording garnet growth during contractional deformation in the middle crust at 54.3 + or - 0.6 Ma, followed by variable recrystallization during subsequent high-temperature ductile extension. The new Lu-Hf ages are the first to confirm that crustal thickening and contraction in the Tibetan Himalaya was broadly synchronous with the early Eocene collision between Greater India and the Eurasian plate.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 7
Title: Tibetan garnet records early Eocene initiation of thickening in the Himalaya
Affiliation: University of Copenhagen, Institute of Geography and Geology, Copenhagen, Denmark
Pages: 591-594
Published: 20140522
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 2014-104609
Categories: Structural geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2014206
Illustration Description: illus. incl. 1 table, geol. sketch map
N27°00'00" - N37°00'00", E72°00'00" - E97°00'00"
N27°00'00" - N37°00'00", E79°00'00" - E99°00'00"
Secondary Affiliation: University of California at Santa Barbara, USA, United StatesCentral Washington University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, 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: 201452
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