If you have any problems related to the accessibility of any content (or if you want to request that a specific publication be accessible), please contact us at firstname.lastname@example.org.
Geology and hydrothermal alteration of the Palmetto property, Esmeralda County, Nevada
AuthorWolverson, Nancy Jean
Geological Sciences and Engineering
AltmetricsView Usage Statistics
Hydrothermally altered andesite/dacite lavas containing detectable precious metals and largely unaltered Paleozoic sedimentary rocks are exposed at the Palmetto property. Within the volcanic rocks alteration envelopes are centered on prominent E-W-trending silica+alunite ribs in sharp contact with argillically altered rocks that grade outward into propylitized rocks. The ribs vary from quartz+alunite in the north to cristobalite+alunite in the south. Sulfur isotopic determinations suggest coarsegrained alunite (£34S = 23.5 per mil) and pyrite (^34S = 3.7 per mil) are hypogene, whereas fine-grained alunite (£34S=0.7 per mil) is supergene. The hypogene alunite has a K-Ar age of 16.1+0.7 m.y. Gold increases below the zone of oxidation with the appearance of approximately 1% pyrite. Based on the presence of hydrothermal breccias and adularia and the abundance of sulfate minerals, boiling probably occurred. The lack of repeated boiling episodes may explain the absence of ore.
Online access for this thesis was created in part with support from the Institute of Museum and Library Services (IMLS) administered by the Nevada State Library, Archives and Public Records through the Library Services and Technology Act (LSTA). To obtain a high quality image or document please contact the DeLaMare Library at https://unr.libanswers.com/ or call: 775-784-6945.
Subjecthydrothermally altered andesite lava
hydrothermally altered dactite lava
Paleozoic sedimentary rocks
E-W-trending silica+alunite ribs
argillically altered rocks
sulfur isotopic determinations
zone of oxidation
Mackay Science Project
Showing items related by title, author, creator and subject.
Alteration and mineralization of the northern half of the Aurora mining district, Mineral County, Nevada Osborne, Marla A (University of Nevada, Reno, 1985)Alteration and mineralization of the Aurora Mining District has been studied. Epithermal precious metal mineralization of the district is confined to 10.3 m. y. old quartz adularia veins in altered andesite. Alteration ...
.Weaver, Stephen George (University of Nevada, Reno, 1982)The Bovard Mining District, located in the Gabbs Valley Range, Mineral County, Nevada produced about $360,000.00 in gold and silver. The mineralization is of the epithermal vein type. The district is underlain by a thick ...