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Tectono-metamorphic evolution of the Tethyan Sedimentary Sequence (Himalayas, SE Tibet)

Chiara Montomoli (1), Salvatore Iaccarino (1), Borja Antolin (2), Erwin Appel (2), Rodolfo Carosi (3), Istvàn Dunkl (4), Ding Lin (5) & Dario Visonà (6)

(1) Dipartimento di Scienze della Terra, Via S. Maria 53, 56126, Pisa (Italy). Corresponding author e-mail: chiara.montomoli@unipi.it.
(2) Institute for Geosciences Tubingen, University of Tubingen (Germany).
(3) Dipartimento di Scienze della Terra, Via Valperga Caluso 35, 10125, Torino (Italy).
(4) Geoscience Center Gottingen, University of Gottingen (Germany).
(5) Institute of Tibetan Plateau Research Beijing, Chinese Academy of Sciences (China).
(6) Dipartimento di Geoscienze Padova, Via Gradenigo 6, 35131, Padova (Italy).

DOI: 10.3301/IJG.2015.42   Pages: 73-88

Abstract

The Tethyan Sedimentary Sequence, one of the major tectonic units of the Himalayan belt cropping out in the inner portion of the chain, has been investigated in SE Tibet to unravel its tectonic and metamorphic evolution.
The Tethyan Sedimentary Sequence recorded at least three phases of ductile defomation, all of them associated to the development of folds and related axial plane foliations. A prominent D1 deformation is progressively overprinted by a D2 deformation approaching the Yarlung Tsangpo suture zone to the North. Structural analysis allowed to recognise two first-order different structural domains: a southern domain in which D1 is the prominent deformation and a northern domain in which the D2 overprint predominates up to transpose D1 deformation. F2 folds show a regional backward vergence (northward) with respect to the southward verging F1 folds. Finite strain data show an increase of D2-related strain moving to the North. It is worth to note that new P-T-d data on polydeformed chloritoid schists point out an increase of both temperature and pressure from D1 to D2 deformation indicating prograde burial during D1-D2 phases and support that F2 folds developed in a compressive tectonic framework during crustal thickening in the time span of 35-25 Ma. The integration of our new deformation and P-T data with available literature data will help to deconvolve the long lasted history of this tectonic unit, far away to be well understood.

Keywords

Tethyan Sedimentary Sequence, SE Tibet, structural analysis, chloritoid schist.

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ITALIAN JOURNAL OF GEOSCIENCES

The official journal of the Italian Geological Society (Società Geologica Italiana) and of the Italian Geological Survey.

 

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