An approach of understanding acid volcanics and tuffaceous volcaniclastics from field studies: A case from Tadpatri Formation, Proterozoic Cuddapah basin, Andhra Pradesh, India

  • Sukanta Goswami
  • P K Upadhyay
  • Sangeeta Bhagat
  • Syed Zakaulla
  • A K Bhatt
  • V Natarajan
  • Sukanta Dey


The lower stratigraphic part of the Cuddapah basin is marked by mafic and felsic volcanism. Tadpatri Formation consists of a greater variety of rock types due to bimodal volcanism in the upper part. Presence of bimodal volcanism is an indication of continental rift setting. Various genetic processes involved in the formation of such volcanic sequence result in original textures which are classified into volcaniclastic and coherent categories. Detailed and systematic field works in Tadpatri–Tonduru transect of SW Cuddapah basin have provided information on the physical processes producing this diversity of rock types. Felsic volcanism is manifested here with features as finger print of past rhyolite-dacite eruptions. Acid volcanics, tuffs and associated shale of Tadpatri Formation are studied and mapped in the field. With supporting subordinate studies on geochemistry, mineralogy and petrogenesis of the volcanics to validate field features accurately, it is understood that volcanism was associated with rifting and shallow marine environmental condition. Four facies (i.e., surge, flow, fall and resedimented volcaniclastic) are demarcated to describe stratigraphic units and volcanic history of the mapped area. The present contribution focuses on the fundamental characterization and categorization of field-based features diagnostic of silica-rich volcanic activities in the Tadpatri Formation.


Acid volcanics Cuddapah basin Tadpatri Formation tuff 



The authors express their sincere gratitude to Shri L K Nanda, Honourable Director, AMD for encouragement and infrastructure support to publish the part of the assigned work. They are also thankful to the respected reviewers for the immensely helpful suggestions.


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Sukanta Goswami
    • 1
  • P K Upadhyay
    • 1
  • Sangeeta Bhagat
    • 1
  • Syed Zakaulla
    • 1
  • A K Bhatt
    • 1
  • V Natarajan
    • 1
  • Sukanta Dey
    • 2
  1. 1.Atomic Minerals Directorate for Exploration and ResearchBengaluruIndia
  2. 2.Indian Institute of Technology (ISM)DhanbadIndia

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