Citation
Greenwood, Robert (1943) Geology of the Sugar Pine Area, Madera County, California. Master's thesis, California Institute of Technology. doi:10.7907/SWC4-F244. https://resolver.caltech.edu/CaltechTHESIS:03312010-140105733
Abstract
The Sugar Pine area includes nine square miles in northern Madera County, on the western slope of the Sierra Nevada. Intrusive rocks of the Sierra batholith surround a central roof pendant and associated minor bodies of strongly folded and metamorphosed Paleozoic sediments. The main mass of the intrusive is tonalite, petrogaphically notable for the selective albitization of its potash feldspar. It contains an abundance of diorite and gabbro and many small pegmatite and aplite dikes complete the Jurassic intrusive sequence. The metamorphic rocks are mainly quartzite, with some schist and calcareous beds, the last giving rise to three distinct metamorphic rock types. The margin of the pendant is locally marked by a zone of partial assimilation and reconstitution. Post-Jurrasic fracturing, perhaps involving some displacement, serves as structural control for several springs in the area. Tungsten mineralization is associated with one of two large pegmatites intruding the central pendant. Scheelite occurs disseminated in lenses of tactite, a restricted facies of the metamorphosed calcareous beds. Some tactite lenses carry over one per cent of scheelite, but small total volume of ore makes the exploitation of the deposit impractical.
| Item Type: | Thesis (Master's thesis) | |||||||||
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| Subject Keywords: | (Geology) ; Sierra batholith, Calaveras Formation, tonalite, tungsten, quartzite, schist, hornfels, pegmatite | |||||||||
| Degree Grantor: | California Institute of Technology | |||||||||
| Division: | Geological and Planetary Sciences | |||||||||
| Major Option: | Geology | |||||||||
| Thesis Availability: | Public (worldwide access) | |||||||||
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| Defense Date: | April 1943 | |||||||||
| Additional Information: | Supplemental Files Information: Geologic map of Sugar Pine area, Madera County, California: Supplement 1 from "Geology of the Sugar Pine area, Madera County, California" (Thesis). Date(s) Collected: 1943. Geologic map of “Tin Bucket” tungsten claims, Madera County, California: Supplement 2 from "Geology of the Sugar Pine area, Madera County, California" (Thesis). Date(s) Collected: 1942. | |||||||||
| Record Number: | CaltechTHESIS:03312010-140105733 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechTHESIS:03312010-140105733 | |||||||||
| DOI: | 10.7907/SWC4-F244 | |||||||||
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| Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 5665 | |||||||||
| Collection: | CaltechTHESIS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 16 Apr 2010 19:07 | |||||||||
| Last Modified: | 10 Nov 2023 17:27 |
Thesis Files
![[img]](https://thesis.library.caltech.edu/style/images/fileicons/application_pdf.png)
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PDF
- Final Version
See Usage Policy. 32MB | |
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PDF (Geologic map)
- Supplemental Material
See Usage Policy. 13MB | |
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PDF (Geologic map of Tin Bucket tungsten claims)
- Supplemental Material
See Usage Policy. 10MB |
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