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Journal of the Geological Society of India

, Volume 92, Issue 4, pp 419–426 | Cite as

Stratigraphy and Sedimentology of Middle Jurassic Sequence of Chorar Island, Patan District, Kachchh Basin, Gujarat

  • Satish J. Patel
  • Jehova L. Darngawn
  • Jaquilin K. Joseph
  • Apurva D. Shitole
Research Articles
  • 26 Downloads

Abstract

Chorar Island exposes ∼109 m thick middle Jurassic (Bathonian-Callovian) succession in the eastern most part of the Kachchh Basin, Patan District, Gujarat and is divided into two, Khadir and Gadhada formations. It mainly comprises of mixed siliciclastic-carbonate sediments and limestones; the shales dominate the lower part of the succession while the top of the succession is marked by ferruginous sandstone which also forms the vast, prominent peripheral zone of the Chorar dome. The field and laboratory analysis of the succession reveals nine lithofacies which includes ferruginous sandstone, cross bedded white sandstone, micritic sandstone, allochemic sandstone, sandy micrite, mudstone, sandy allochemic limestone, coralline limestone and shale. The mix siliciclastic-carbonate sediments and ferruginous facies are fossiliferous in nature and display sedimentary structures, like ripple marks, cross- and planar- lamination with biogenic sedimentary structures. Coralline limestone facies comprise of large size (>1m diameter) corals, which are diagenetically modified severely and have lost its original internal structures. The sediment characteristics and associated bioclasts indicates low to moderate wave and current energy in shoreface-offshore subsequently changing to wave dominated shoreface during the deposition of the middle Jurassic sediments of the Chorar Island.

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Copyright information

© Geological Society of India 2018

Authors and Affiliations

  • Satish J. Patel
    • 1
  • Jehova L. Darngawn
    • 1
  • Jaquilin K. Joseph
    • 1
  • Apurva D. Shitole
    • 1
  1. 1.Department of GeologyThe M. S. University of BarodaVadodaraIndia

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