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Geology and Ore Deposits of the Darwin Silver-Lead Mining District, Inyo County, California

Citation

Kelley, Vincent Cooper (1937) Geology and Ore Deposits of the Darwin Silver-Lead Mining District, Inyo County, California. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/FA9Y-JW30. https://resolver.caltech.edu/CaltechTHESIS:04112018-154512700

Abstract

The survey of the geology and ore deposits of the Darwin Hills presents two major problems. The first is the origin of the stratified silicate aureole about the Darwin stock. Such silication may be accomplished by pure thermal metamorphism or by additive processes. Field relations, supported by petrographic and chemical evidence, indicate that metasomatism played the dominant role. Considerable silica and other materials were introduced into the limestones by the magmatic emanations.

The second major problem involves the origin and classification of the ore deposits. The deposition of all the ore bodies took place at a distinctly later time that the development of the silicate aureole. A period of tectonic fracturing in which most of the fissures of the district were developed intervened between the early silication period and the later metallization period. Three structural controls, igneous contacts, bedding planes, and fractures, dominated the location of the deposits. Genetically all three structural types are the same.

The ore mineralization is not of the high temperature type and hence is not pyrometasomatic as classed by Knopf. Because of certain structural and textural features and the presence of such gangue minerals as fluorite and barite, the deposits are classed as upper mesothermal.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Geology
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geology
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Fraser, Horace J.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1937
Additional Information:Supplemental Files Information: Geologic map of the Christmas Gift claim group: Supplement 1 from "Geology and Ore Deposits of the Darwin Silver-Lead Mining District, Inyo County, California" (Thesis). Claim map of the Darwin Silver-Lead mining district: Supplement 2 from "Geology and Ore Deposits of the Darwin Silver-Lead Mining District, Inyo County, California" (Thesis). Geologic map of the Darwin Silver-Lead mining district: Supplement 3 from "Geology and Ore Deposits of the Darwin Silver-Lead Mining District, Inyo County, California" (Thesis).
Record Number:CaltechTHESIS:04112018-154512700
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:04112018-154512700
DOI:10.7907/FA9Y-JW30
Related URLs:
URLURL TypeDescription
https://doi.org/10.22002/D1.983DOISupplement 1 in CaltechDATA: Geologic map of the Christmas Gift claim group
https://doi.org/10.22002/D1.984DOISupplement 2 in CaltechDATA: Claim map of the Darwin Silver-Lead mining district
https://doi.org/10.22002/D1.985DOISupplement 3 in CaltechDATA: Geologic map of the Darwin Silver-Lead mining district
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10802
Collection:CaltechTHESIS
Deposited By: Tony Diaz
Deposited On:25 Apr 2018 23:34
Last Modified:04 Oct 2019 00:20

Thesis Files

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PDF (Thesis) - Final Version
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PDF (Geologic map of the Christmas Gift claim group) - Supplemental Material
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PDF (Claim map of the Darwin Silver-Lead mining district) - Supplemental Material
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PDF (Geologic map of the Darwin Silver-Lead mining district) - Supplemental Material
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