Environmental Geology

, Volume 45, Issue 7, pp 920–939

Using the geologic setting of talc deposits as an indicator of amphibole asbestos content

  • Bradley S. Van Gosen
  • Heather A. Lowers
  • Stephen J. Sutley
  • Carol A. Gent
Original Article

DOI: 10.1007/s00254-003-0955-2

Cite this article as:
Van Gosen, B.S., Lowers, H.A., Sutley, S.J. et al. Env Geol (2004) 45: 920. doi:10.1007/s00254-003-0955-2

Abstract

This study examined commercial talc deposits in the U.S. and their amphibole-asbestos content. The study found that the talc-forming environment directly influenced the amphibole and amphibole-asbestos content of the talc deposit. Large talc districts in the U.S. have mined hydrothermal talcs that replaced dolostone. Hydrothermal talcs, created by siliceous fluids heated by magmas at depth, consistently lack amphiboles as accessory minerals. In contrast, mineable talc deposits that formed by contact or regional metamorphism consistently contain amphiboles, locally as asbestiform varieties. Examples of contact metamorphic deposits occur in Death Valley, California; these talc-tremolite deposits contain accessory amphibole-asbestos. Talc bodies formed by regional metamorphism always contain amphiboles, which display a variety of compositions and habits, including asbestiform. Some industrial mineral deposits are under scrutiny as potential sources of accessory asbestos minerals. Recognizing consistent relations between the talc-forming environment and amphibole-asbestos content may be used in prioritizing remediation or monitoring of abandoned and active talc mines.

Keywords

Talc Amphibole-asbestos Geologic setting Hydrothermal Metamorphic USA 

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Bradley S. Van Gosen
    • 1
  • Heather A. Lowers
    • 1
  • Stephen J. Sutley
    • 1
  • Carol A. Gent
    • 1
  1. 1.U.S. Geological Survey DenverUSA

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