The Marwar Group is a Neoproterozoic - Early Cambrian sequence of sedimentary rocks exposed in NW-India that are similar to successions found in Oman(Huqf-Supergroup) and the Salt-Range in Pakistan. Attempts to correlate these locations have been hampered by the poor age control and limited exposure of the Marwar Group. The goal of this project is to resolve this by meeting three core objectives: (1) establish a better chronostratigraphic framework for the Marwar Group based on evidence from detrital zircon U-Pb dating, (2) conduct detailed eld mapping to test and rene existing stratigraphic models and (3) produce a detailed 13C isotope prole for the carbonates that can be used for regional correlation. Mapping of the Neoproterozoic-Cambrian outcrops of the Nagaur Basin in Marwar, Rajasthan are subdivided into the Jodhpur Sandstone, the Bilara Carbonate and the Nagaur Sandstone. Results from the sandstone rocks of the Jodhpur and Nagaur Formations yielded zircon ages that belong to three main age groups at; 0.7-1.1 Ga, 1.6-1.9 Ga and 2.4-2.7 Ga, consistent with a common provenance. The youngest zircon ages indicate the maximum age of the Marwar Group is 0.75 Ga. I discovered that the carbonates of the Bilara Formation, were deposited in a restricted environment with a range of 13C values that are typical for a restricted basin. Therefore the 13C values are not suitable to be correlated to isotope curves from other, open marine, basins and they do not provide improve on the existing chronostratigraphic framework of the Marwar Group.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:626130 |
| Date | January 2013 |
| Creators | Papp, M. L. |
| Publisher | University College London (University of London) |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://discovery.ucl.ac.uk/1389020/ |
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