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Precambrian stromatolite and other structures in the Rajpura-Dariba polymetallic ore deposit, Rajasthan, India

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Abstract

Intimate association of ∼ 2 billion years old stromatolite with pyritic lead-zinc ores in the Precambrian polymetallic deposit at Rajpura-Dariba in Rajasthan, which hitherto remained unreported, provides an additional documentation of the syn(-dia)-genetic mineralization. The growth form and petrography of the stromatolite structure have been described and an explanation sought regarding the concentration of sulfides along the siliceous and carbonaceous laminations, as well as in the intercolumnar regions. Consideration of the geologic features noted in the mineralized zone and surrounding region suggests that the stratiform ores were deposited in a near-shore shallow marine environment, developed on basement highs and associated with euxinic conditions. Later, the ores were metamorphosed under conditions reaching upto amphibolite facies during a three-stage deformational history of their enclosing rocks. Some salient features of the secondary structures in the ores have been discussed in relation to this deformation history.

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Deb, M., Banerjee, D.M. & Bhattacharya, A.K. Precambrian stromatolite and other structures in the Rajpura-Dariba polymetallic ore deposit, Rajasthan, India. Mineral. Deposita 13, 1–9 (1978). https://doi.org/10.1007/BF00202904

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Keywords

  • Lamination
  • Stromatolite
  • Basement High
  • Amphibolite Facies
  • Deformation History