Tectonic activity along the inner margin of the south Tibetan detachment constrained by syntectonic leucogranite emplacement in Western Buthan

Montomoli, Chiara; Carosi, Rodolfo; Rubatto, Daniela; Visoná, Dario; Iaccarino, Stefano (2017). Tectonic activity along the inner margin of the south Tibetan detachment constrained by syntectonic leucogranite emplacement in Western Buthan. Italian journal of geosciences, 136(1), pp. 5-14. Società Geologica Italiana 10.3301/IJG.2015.26

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In Western Bhutan Himalayas leucogranite dykes emplaced in sub-vertical hybrid fractures that cut across the high-grade rocks of the upper Greater Himalayan Sequence just below to the South Tibetan Detachment. The granitic dykes dip to the North often showing a mylonitic deformation with a top-down to-the-N sense of shear. The high-angle fractures are interpreted to be related to the evolution of the South Tibetan Detachment toward a brittle regime of deformation. U-Pb monazite ages constrain the leucogranite emplacement at 13.9±06 Ma implying that brittle-ductile deformation of the South Tibetan Detachment was active at that time. NNE-SSW to nearly E-W trending large scale antiforms and synforms mapped in NW Bhutan affected the Greater Himalayan Sequence and South Tibetan Detachment only after 14 Ma.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Isotope Geology

UniBE Contributor:

Rubatto, Daniela

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2038-1719

Publisher:

Società Geologica Italiana

Language:

English

Submitter:

Daniela Rubatto

Date Deposited:

19 Jul 2018 16:00

Last Modified:

19 Jul 2018 16:00

Publisher DOI:

10.3301/IJG.2015.26

BORIS DOI:

10.7892/boris.92149

URI:

https://boris.unibe.ch/id/eprint/92149

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