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.

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