Gypsum–anhydrites in 1.9 Ga Vempalle Formation, Cuddapah basin, India: A note on the Palaeoproterozoic environment and diagenetic condition

  • Purnajit BhattacharjeeEmail author
  • Sukanta Goswami
  • Sangeeta Bhagat
  • M B Verma


The Cuddapah basin consists of generally well-preserved Palaeoproterozoic–Neoproterozoic sedimentary and associated volcanic rocks. The detailed lithological studies of sedimentary rocks of Vempalle Formation from the narrow linear belt of 15 km, in the southern margin, show the occurrence of layered gypsum in the cherty dolostone–shale intercalated facies, red shale and phosphatic dolostone facies of the Vempalle Formation. The petromineralogical studies reveal that gypsum is in close association with anhydrites. Microscopically, three different types of gypsum and anhydrite are identified, viz., lath-shaped, equant-shaped and anhedral-shaped grains. The equant variety corresponds to a granular gypsum, whereas the anhedral grains of gypsum exist as the granular and fibrous variety as seen in the hand specimen. The presence of gypsum/anhydrite has been confirmed by the petromineralogical, X-ray diffraction and chemical analytical data. The phosphatic dolostone is the host rock for stratabound type of uranium deposit at Tummalapalle, Cuddapah district, Andhra Pradesh, which is one of the most unique types of uranium mineralisation in the world. Abundant pseudomorphs of gypsum and anhydrite relicts and discontinuous gypsum layers within these dolostones, nodules of chert and gypsum indicate the interrelationship between the diagenesis and genesis of uranium mineralisation which indicates the carbonate precipitation in the sulphate-rich hypersaline environments.


Gypsum Vempalle Formation Uranium deposit Cuddapah basin Andhra Pradesh 



We express our sincere gratitude to honourable Director, AMD for encouragement and infrastructure support to publish this work. We thank the scientists of Atomic Minerals Directorate at chemistry laboratory, Bengaluru and X-ray diffraction (XRD) laboratory, Hyderabad, for analysis of samples.


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Purnajit Bhattacharjee
    • 1
    Email author
  • Sukanta Goswami
    • 1
  • Sangeeta Bhagat
    • 1
  • M B Verma
    • 2
  1. 1.Atomic Minerals Directorate for Exploration and Research, Department of Atomic EnergyBengaluruIndia
  2. 2.Atomic Minerals Directorate for Exploration and Research, Department of Atomic EnergyHyderabadIndia

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