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Figure 1. Location map of CTDs in western North Isotopic signature of hydrothermal sulfates from Carlin-type ore deposits
 

Summary: Figure 1. Location map of CTDs in western North
America.
Isotopic signature of hydrothermal sulfates from Carlin-type ore deposits
Greg B. Arehart, Department of Geological Sciences
University of Nevada - Reno
Reno, NV 89557-0138
arehart@mines.unr.edu
ABSTRACT
Stable isotopes from sulfates of three origins in Carlin-type deposits (CTDs) from western North America fall into distinct
clusters and can be utilized to discriminate between barite of Paleozoic (sedimentary exhalative) origin, barite of
hydrothermal origin related to gold mineralization, and supergene alunite and jarosite of weathering origin. Although the
latter are obvious from field relations, the distinction between hydrothermal and sedex barite is not always so clear. Sedex
sulfate sulfur was probably reduced and mobilized during gold mineralization, equilibrated with hydrothermal fluids, and
then precipitated as sulfate during the late stages of mineralization, with a distinctly different sulfur and oxygen isotope
signature. Isotopic signatures of sulfates may, therefore, be utilized as a mineral exploration tool for CTDs.
1 INTRODUCTION
Sedimentary rock-hosted disseminated gold deposits, also
known as Carlin-type gold deposits (CTDs), are among the
most economically important types of ore deposits
currently being sought and mined in the US. In excess of

  

Source: Arehart, Greg B. - Department of Geological Sciences, Mackay School of Mines, University of Nevada, Reno

 

Collections: Geosciences