North-South Extension in the Tibetan Crust Triggered by Granite Emplacement
Document Type
Article
Department or Administrative Unit
Geological Sciences
Publication Date
11-1-2005
Abstract
We combine zircon sensitive high-resolution ion microprobe U-Pb spot dating and mica 40Ar-39Ar plateau ages with field-geological and geochemical constraints from the Mala shan area of Southern Tibet to show that the deformed granite core of the North Himalayan metamorphic domes in this area is not Indian basement, but was intruded and deformed during the Himalayan orogeny. Microstructural observations reveal that a transition from top-to-the-south thrust-related to top-to-the-north extension-related deformation occurred during granite intrusion and related metamorphism. This suggests that intrusion triggered the onset of extensional tectonics in the Tibetan middle to upper crust. Expected positive feedback mechanisms between decompression melting leading to more intrusion and more extensional deformation suggest that this mechanism may have been important on a regional scale.
Recommended Citation
Aoya, M., Wallis, S. R., Terada, K., Lee, J., Kawakami, T., Wang, Y., & Heizler, M. (2005). North-south extension in the Tibetan crust triggered by granite emplacement. Geology, 33(11), 853. https://doi.org/10.1130/g21806.1
Journal
Geology
Rights
© 2005 Geological Society of America.
Comments
This article was originally published in Geology. The full-text article from the publisher can be found here.
Due to copyright restrictions, this article is not available for free download from ScholarWorks @ CWU.