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Tectono-thermal evolution of the India-Asia collision zone based on Ar-40-Ar-39 thermochronology in Ladakh, India

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Title Tectono-thermal evolution of the India-Asia collision zone based on Ar-40-Ar-39 thermochronology in Ladakh, India
 
Creator BHUTANI, R
PANDE, K
VENKATESAN, TR
 
Subject indus suture zone
continental collision
northwest himalaya
tectonic evolution
k-feldspar
nw india
age
batholith
pakistan
arc
india-asia collision
ar-40-ar-39 thermochronology
deformation
trans-himalaya
 
Description New Ar-40-Ar-39 thermochronological results from the Ladakh region in the India-Asia collision zone provide a tectono-thermal evolutionary scenario. The characteristic granodiorite of the Ladakh batholith near Leh yielded a plateau age of 46.3 +/- 0.6 Ma (2sigma). Biotite from the same rock yielded a plateau age of 44.6 +/- 0.3 Ma (2sigma). The youngest phase of the Ladakh batholith, the leucogranite near Himya, yielded a cooling pattern with a plateau-like age of similar to 36 Ma. The plateau age of muscovite from the same rock is 29.8 +/- 0.2 Ma (2sigma). These ages indicate post-collision tectono-thermal activity, which may have been responsible for partial melting within the Ladakh batholith. Two basalt samples from Sumdo Nala have also recorded the post-collision tectono-thermal event, which lasted at least for 8 MY in the suture zone since the collision, whereas in the western part of the Indus Suture, pillow lava of Chiktan showed no effect of this event and yielded an age of emplacement of 128.2 +/- 2.6 Ma (2sigma). The available data indicate that post-collision deformation led to the crustal thickening causing an increase in temperature, which may have caused partial melting at the base of the thickened crust. The high thermal regime propagated away from the suture with time.
 
Publisher INDIAN ACADEMY SCIENCES
 
Date 2011-08-02T08:31:33Z
2011-12-26T12:53:47Z
2011-12-27T05:40:49Z
2011-08-02T08:31:33Z
2011-12-26T12:53:47Z
2011-12-27T05:40:49Z
2004
 
Type Article
 
Identifier PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES-EARTH AND PLANETARY SCIENCES, 113(4), 737-754
0253-4126
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8726
http://hdl.handle.net/10054/8726
 
Language en