Early Miocene rapid exhumation in southern Tibet: insights from P–T–t–D–magmatism path of Yardoi dome

Wang, Jia-Min; Wu, Fu-Yuan; Rubatto, Daniela; Liu, Kai; Liu, Xiao-Chi (2018). Early Miocene rapid exhumation in southern Tibet: insights from P–T–t–D–magmatism path of Yardoi dome. Lithos, 304-307, pp. 38-56. Elsevier 10.1016/j.lithos.2018.02.003

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Reconstructing the evolution of Gneiss domeswithin orogenic belts poses challenges because domes can form in a variety of geodynamic settings and by multiple doming mechanisms. For the North Himalayan gneiss domes (NHGD), it is debated whether they formed during shortening, extension or collapse of the plateau, and what is the spatial and temporal relationship ofmagmatism,metamorphism and deformation. This study investigates the Yardoi dome in southern Tibet using field mapping, petrography, phase equilibria modelling and new monazite ages. The resulting P–T–time–deformation–magmatism path for the first time reveals the spatial and temporal relationship of metamorphism, deformation and magmatism in the Yardoi dome: a) the dome mantle recorded prograde loading to kyanite-grade Barrovian metamorphic conditions of 650±30 °C and 9 ± 1 kbar (M2) in the Early Miocene (18–17 Ma); b) the main top-to-the-north deformation fabric (D2) formed syn- to post-peak metamorphism; c) the emplacement of leucorgranites related to doming is syn-metamorphism at 19–17 Ma. The link between the detachment shear zone in the Yardoi dome and the South Tibetan detachment system(STDS) is confirmed. By comparingwith orogen-scale tectonic processes in the Himalaya,we suggest that north-south extension in a convergent geodynamic setting during Early Miocene accounts for formation of the Yardoi dome. In a wider tectonic context, the Early Miocene rapid exhumation of deep crustal rocks was contemporaneous with the rapid uplift of southern Tibet and the Himalayan orogen.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Rubatto, Daniela

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0024-4937

Publisher:

Elsevier

Language:

English

Submitter:

Daniela Rubatto

Date Deposited:

02 May 2018 12:20

Last Modified:

02 May 2018 12:20

Publisher DOI:

10.1016/j.lithos.2018.02.003

BORIS DOI:

10.7892/boris.112633

URI:

https://boris.unibe.ch/id/eprint/112633

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