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Geological evaluation of EIGEN-6C4 and GOCE derived gravity models in and around Karakoram shear zone, Leh, India

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Journal of the Geological Society of India

Abstract

New generation high resolution gravity models derived from space-borne gravity data, integrated with land based surveys, have enabled understanding of regional gravity field over regions, which are till date considered to be inaccessible for land surveys, especially in mountainous terrains. In this study, we evaluate two high resolution gravity models EIGEN-6C4 and GO_CONS_GCF_2_TIM_R5 in order to understand its usability in identification of meso-scale regional geological features and lithological boundaries around the Karakoram shear zone, in Leh, India. The EIGEN-6C4 is a “hybrid” model integrating data from space-borne sensors and terrestrial data, whereas GO_CONS_GCF_2_TIM_R5 is a model derived from the latest space-borne GOCE sensor. Bouguer gravity anomaly has been derived for both the models and compared. It is seen that, the GOCE derived model pertains to the regional gravity field of the region and compares well with the regional derivative of the EIGEN-6C4 model. Further, the EIGEN-6C4 has been analyzed using horizontal derivatives (dx, dy), analytical signal (ANS) and tilt derivative (TDR) techniques. These, derived maps are then overlain on published geological map of the area to understand the correlation between sub-surface geology vis a vis gravitational signal. The major and distinct geological signatures as derived from the various derivative maps correlate well with the existing geological map. The source boundaries derived from the TDR map agrees reasonably well with the lithological boundaries. Further, the anomaly and derivative maps from EIGEN-6C4 indicates towards a possible continuation of the Shyok suture zone in the region. Therefore, for the given spatial extent of the area under consideration, the GOCE derived model represents the regional field, whereas the EIGEN-6C4 data and derivatives are of sufficient resolution for understanding the geological variability in and around the Karakoram shear zone.

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  1. National Remote Sensing Centre, Indian Space Research Organization, Hyderabad, 500 037, India

    Priyom Roy, A. Sai Krishnaveni & K. Vinod Kumar

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  1. Priyom Roy
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  2. A. Sai Krishnaveni
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Roy, P., Sai Krishnaveni, A. & Vinod Kumar, K. Geological evaluation of EIGEN-6C4 and GOCE derived gravity models in and around Karakoram shear zone, Leh, India. J Geol Soc India 90, 51–61 (2017). https://doi.org/10.1007/s12594-017-0663-2

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  • DOI: https://doi.org/10.1007/s12594-017-0663-2

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