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Data Series 875

Geochemical and Modal Data for Igneous Rocks Associated with Epithermal Mineral Deposits

By Edward A. du Bray

Thumbnail of and link to report PDF (497 kB)Abstract

The purposes of this report are to (1) present available geochemical and modal data for igneous rocks associated with epithermal mineral deposits and (2) to make those data widely and readily available for subsequent, more in-depth consideration and interpretation. Epithermal precious and base-metal deposits are commonly associated with subduction-related calc-alkaline to alkaline arc magmatism as well as back-arc continental rift magmatism. These deposits form in association with compositionally diverse extrusive and intrusive igneous rocks. Temperature and depth regimes prevailing during deposit formation are highly variable. The deposits form from hydrothermal fluids that range from acidic to near-neutral pH, and they occur in a variety of structural settings. The disparate temperature, pressure, fluid chemistry, and structural controls have resulted in deposits with wide ranging characteristics. Economic geologists have employed these characteristics to develop classification schemes for epithermal deposits and to constrain the important genetic processes responsible for their formation.

First posted August 29, 2014

For additional information, contact:
Director, Central Mineral and Environmental Resources Science Center
U.S. Geological Survey
Box 25046, MS 973
Denver, CO 80225
http://minerals.cr.usgs.gov/

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Suggested citation:

du Bray, E.A., 2014, Geochemical and modal data for igneous rocks associated with epithermal mineral deposits: U.S. Geological Survey Data Series 875, 13 p., https://dx.doi.org/10.3133/ds875.

ISSN 2327-638X (online)



Contents

Introduction

Data Compilation Methods

Data Fields

Acknowledgments

References Cited

Appendix 1. Geochemical and Modal Data for Epithermal Deposits


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