The Greater Himalayan Sequence (GHS) is one of the major tectonic units of the Himalaya running for more than 2400 km along-strike. It has been considered as a coherent tectonic unit bound by the South Tibetan Detachment (STD) and the Main Central Thrust (MCT). However, thrusts within it have been recognized in several places and have been mainly interpreted as out-of-sequence thrusts being active after the main phase of exhumation of the crystalline unit after the MCT activated. Recent integrated studies allow the recognition of several ductile shear zones in the core of the GHS, with top-to-the-SW-sense of shear (Higher Himalayan Discontinuity (HHD)). U–Th–Pb in situ monazite ages provide ages older than the MCT. Data on pressure and temperature evolution testify that these shear zones affected the tectonometamorphic evolution of the belt and different pressure and temperature conditions were recorded in the hanging wall and footwall of the HHD. The correlation of the WNW–ESE-trending HHD with other discontinuities recognized in the GHS led to the proposal that it is a tectonic feature running for several hundred kilometres, documented at the regional scale dividing the GHS in two different portions

Tectonometamorphic discontinuities in the Greater Himalayan Sequence: a local or a regional feature?

CAROSI, Rodolfo;IACCARINO, Salvatore;MONTOMOLI C.
2015-01-01

Abstract

The Greater Himalayan Sequence (GHS) is one of the major tectonic units of the Himalaya running for more than 2400 km along-strike. It has been considered as a coherent tectonic unit bound by the South Tibetan Detachment (STD) and the Main Central Thrust (MCT). However, thrusts within it have been recognized in several places and have been mainly interpreted as out-of-sequence thrusts being active after the main phase of exhumation of the crystalline unit after the MCT activated. Recent integrated studies allow the recognition of several ductile shear zones in the core of the GHS, with top-to-the-SW-sense of shear (Higher Himalayan Discontinuity (HHD)). U–Th–Pb in situ monazite ages provide ages older than the MCT. Data on pressure and temperature evolution testify that these shear zones affected the tectonometamorphic evolution of the belt and different pressure and temperature conditions were recorded in the hanging wall and footwall of the HHD. The correlation of the WNW–ESE-trending HHD with other discontinuities recognized in the GHS led to the proposal that it is a tectonic feature running for several hundred kilometres, documented at the regional scale dividing the GHS in two different portions
2015
Tectonics of the Himalaya
Geological Society of London, Special Publications
Geological Sociey Special Publication
412
25
41
978-1-86239-703-3
http://sp.lyellcollection.org/content/412/1
Tectonics, Himalaya, Greater Himalayan Sequence, Discontinuities, shear zones, metamorphism, geochrnology
Montomoli, Chiara; Carosi, Rodolfo; Iaccarino, Salvatore
File in questo prodotto:
File Dimensione Formato  
Montomoliet al, 2015-GSL.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 4.04 MB
Formato Adobe PDF
4.04 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Geological Society of London_2015_Iaccarino S.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 4.02 MB
Formato Adobe PDF
4.02 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Montomoli et al., 2015_pre-proof2.pdf

Accesso aperto

Descrizione: preprint
Tipo di file: PREPRINT (PRIMA BOZZA)
Dimensione 6.19 MB
Formato Adobe PDF
6.19 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1528978
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 106
  • ???jsp.display-item.citation.isi??? ND
social impact