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Paper No. 152-19 Presentation Time: 1:30 PM-5:30 PM DEVELOPING A SPATIAL AND TEMPORAL MODEL OF CARBONATE
 

Summary: Paper No. 152-19 Presentation Time: 1:30 PM-5:30 PM DEVELOPING A
SPATIAL AND TEMPORAL MODEL OF CARBONATE
VEIN CHARACTERIZATION IN AND AROUND CARLIN-
TYPE GOLD DEPOSITS BUCHANAN, Norman Scott, Geological Sciences,
University of Nevada - Reno, Reno, NV 89557, NSBrewer@aol.com and AREHART, Greg B.,
Geological Sciences, Univ of Nevada, Reno, Geological Sciences, MS-172, University of
Nevada, Reno, Reno, NV 89557
Carlin-type deposits have an alteration pattern of decarbonatization, silicification, and
argillization. Decarbonatization is the most extensive of the alteration. Little is known about the
destination of the carbonates that are leached from the limestone although there appears to be a
halo of carbonate veins around many deposits. On a deposit to regional scale there is a lack of
clear and consistent crosscutting relationships in the multiple-stage carbonate veins in and
around Carlin-type deposits. In addition, little has been done to separate vein generations based
on vein composition and geochemistry. The research reported here focuses on geochemical
methods to help determine carbonate vein paragenesis. Carbonate staining was used in the field,
followed by trace element and isotope geochemistry to chemically differentiate the carbonate
veins. All of theses techniques demonstrate zoning with respect to the geology. Iron is related to
the wallrock type, base metals (Zn and Ni) are present as halos above the deposits, and some rare
earth elements (Sm and Eu) also show complex zoning patterns. The zoning data suggest up to as
many as five phases or events are recognizable, not all of which are necessarily related to the

  

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

 

Collections: Geosciences