Mineralium Deposita

, Volume 40, Issue 6–7, pp 755–765 | Cite as

Mineralization and deformation of the Malanjkhand terrane (2,490–2,440 Ma) along the southern margin of the Central Indian Tectonic Zone

  • Holly Stein
  • Judith Hannah
  • Aaron Zimmerman
  • Richard Markey
Letter/Discussion

Abstract

The Malanjkhand Cu–Mo–Au deposit, located near the northwest margin of the Malanjkhand batholith (terrane), is a strategic and significant porphyry-style deposit that experienced a protracted 50 m.y. deformational history shortly after its formation at 2,490±8 Ma (Stein et al. 2004). In a recent study, Panigrahi et al. (2004) averaged U–Pb SHRIMP zircon data from a pooled set of samples from the Malanjkhand batholith to advocate a meaningless intermediate age of ~2,476 Ma for the Malanjkhand granitoid and its Cu–Mo–Au deposit. In the northwest part of the Malanjkhand batholith, Re–Os dating of occurrence-specific molybdenite captures not only the age of porphyry-style mineralization and associated magmatism, but also elucidates a complex deformational history that extends to ~2,450 Ma. In the central part of the Malanjkhand batholith, Re–Os dating of delicate spindles of accessory molybdenite occurring with pristine muscovite in miarolitic cavities within the undeformed microgranitoid at the Devgaon Mo prospect unequivocally shows that deformation ceased at this location no later than 2,470–2,465 Ma. The deformational history recorded at the Malanjkhand deposit in the northwest most likely reflects prolonged transpressive convergence and docking of the Malanjkhand terrane with units in the poorly understood (proto) Central Indian Tectonic Zone (CITZ) along its southern margin, the Central Indian shear zone. The timing for this convergence is Late Archean–Early Paleoproterozoic.

Keywords

Malanjkhand Devgaon Re–Os dating Molybdenite Deformation Central Indian Tectonic Zone 

Notes

Acknowledgements

A high level of interest in the Malanjkhand deposit prompted Mineralium Deposita editor Bernd Lehmann to invite us to expand our original discussion to include a few newly acquired age data and pictorial documentation of the Malanjkhand pit and granitoid-mineralization textures observed therein. We appreciate this opportunity. We thank M.K. Panigrahi for early sharing of information on the zircon ages at Malanjkhand through e-mail. We acknowledge the support of the US National Science Foundation (research grant EAR-0087483, planning visit INT-0431929) and Edward M. Warner. CSU graduate student Parham Gardner assisted with sampling and provided the new isotopic analyses reported here. We are indebted to our Indian colleagues (B.S. Jhala and G.L. Sindhupe, Hindustan Copper Ltd, and P.K. Raut, Geological Survey of India at Nagpur) with whom we spent a fruitful 3 weeks in January 2005 examining the Malanjkhand Cu–Mo–Au deposit and various prospects in the Malanjkhand batholith and surrounding terranes. The entire expedition would not have been possible without the expert guidance and oversight of M.K. Pandit (University of Rajasthan, Jaipur). For their welcome to us, their interest, their expert guidance, and their friendship we are most grateful.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Holly Stein
    • 1
    • 2
  • Judith Hannah
    • 1
  • Aaron Zimmerman
    • 1
  • Richard Markey
    • 1
  1. 1.AIRIE Program, Department of GeosciencesColorado State UniversityFort CollinsUSA
  2. 2.Geological Survey of NorwayTrondheimNorway

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