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Dear all,

Thank you all very much for your replies, on and off the list. Most of the feedback has been very detailed and I really appreciate the time and effort put in. You have certainly given me lots to think about and some valuable papers that I need to read. Of course, it’s no surprise that there isn't a unanimous answer, but now I have a lot more information that will help me to weigh-up the different scenarios and decide what is most sensible to use in my work.

Thanks again!
 
Richard Palin
 
Lecturer and Postdoctoral Research Assistant,
Institute of Geosciences,
Johannes Gutenberg University of Mainz, 
Becher-Weg 21, 55128 Mainz, Germany
 
http://www.staff.uni-mainz.de/rpalin/
 
“Rocks are records of events that took place at the time they formed. They are books. They have a different vocabulary, a different alphabet, but you learn how to read them.” – John McPhee


On 17 Sep 2015, at 16:12, Peter D Clift <[log in to unmask]> wrote:

Dear Richard

This is a very interesting question but one I think that has a relatively simple answer.  We know that Greater India reconstructs against the western edge of Australia so as India moved away from Australia the onset of seafloor spreading would be the same as that now found off the West Australian coast,i.e., around 132 Ma. Because the Wallaby-Zenith fractures zone marks the transform along which Greater India moved it stands to reason that the oldest oceanic crust offshore that northern margin of Greater India  would be ~132 Ma, in Western India/Pakistan  and become progressively younger going towards the east. I found the following reference quite instructive in this respect

Ali, J.R., Aitchison, J.C., 2014. Greater India’s northern margin prior to its collision with Asia. Basin Research, 26: 73–84. doi: 10.1111/bre.12040

 best wishes
 Peter


On Sep 17, 2015, at 7:08 AM, Richard Palin <[log in to unmask]> wrote:

Hi all,

I was wondering whether anyone knew of a reference for the estimated age of Indian-plate oceanic crust that was subducted beneath Asia at the onset of India–Asia collision (c. 50 Ma)? I have searched long and hard online and have found a few speculative numbers, but nothing that seems reliable (i.e. the age data I have found vary quite a lot). Maybe there are some prominent studies out there, but I am searching for the incorrect terms.

Any suggestions would be appreciated.

Richard Palin

Lecturer and Postdoctoral Research Assistant,
Institute of Geosciences,
Johannes Gutenberg University of Mainz,
Becher-Weg 21, 55128 Mainz, Germany

http://www.staff.uni-mainz.de/rpalin/

“Rocks are records of events that took place at the time they formed. They are books. They have a different vocabulary, a different alphabet, but you learn how to read them.” – John McPhee

 
 
======================
 
Peter D. Clift
Charles T. McCord Chair in Petroleum Geology,
Department of Geology and Geophysics,
E235 Howe-Russell-Kniffen Geoscience Complex
Louisiana State University,
Baton Rouge, LA 70803,
USA
 
Tel: +1 225-578-2153
Fax: +1 225-578-2302
Email: [log in to unmask]
 
http://www.geol.lsu.edu/pclift/pclift/Home.html