Title

Petrology and Petrography of the Metamorphic Aureole Associated with the Deep Post Orebody, Eureka County, Nevada

Abstract

The Post Gold deposit is located in the northern part of the Carlin trend. The mineralization at Post occurs in proximity to a Jurassic-Cretaceous composite stock. Most of the gold at Post is hosted by non-metamorphosed calcareous siltstone and highly altered diorite, adjacent to the low grade skarn. Endoskarn, exoskarn, hornfels and marble are developed outward from the intrusive. The skarn is composed dominantly of diopside, tightly intergrown with garnet, k-feldspar, and sphene. The highest grade gold values are adjacent to the skarn, which acted as a permeability barrier to fluid migration. Post is the first Carlin-type deposit at which a skarn has been recognized to play a significant role in the localization of gold.

Meeting Name

Gold '90 Symposium (1990: Feb. 26-Mar. 1, Salt Lake City, UT)

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Geology - Nevada; Petrology - Petrography; Jurassic-Cretaceous Composite Stock; Ore Genesis; Paragenesis; Pyroxene Hornfels; Skarns; Gold Deposits

Geographic Coverage

Eureka County, Nevada

International Standard Book Number (ISBN)

087335091X

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1990 Society for Mining, Metallurgy and Exploration, All rights reserved.

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