Mesozoic tectonic evolution of the Twin Buttes Mine area, Pima County, Arizona: implications for a regional tectonic contro of ore deposits in the Pima mining district

Walker, Scott Donald

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dc.contributor.author	Walker, Scott Donald
dc.creator	Walker, Scott Donald	en
dc.date.accessioned	2015-06-18T11:09:13Z	en
dc.date.available	2015-06-18T11:09:13Z	en
dc.date.issued	1982	en
dc.identifier.uri	http://hdl.handle.net/10150/557930	en
dc.description.abstract	Ground magnetic data are consistent with the interpretation that Lower Jurassic volcanic rocks of the Twin Buttes mine area (Ox Frame Volcanics) are confined to a distinct block by the northwest trending Sawmill Canyon Fault Zone which was initially active during the Lower Jurassic. Possible reactivation of the Sawmill Canyon Fault zone in the Middle Jurassic as a left-lateral wrench fault is recorded by the deposition of syntectonic red-beds (Rodolfo Formation). Lower Cretaceous rocks (Whitcomb Quartzite, Glance Conglomerate, and Angelica Akrose) were deposited in alluvial environments resulting from additional reactivation of the Sawmill Canyon Fault Zone. Upper Cretaceous (Laramide) deformation involved the formation of northwest trending folds and northwest and northeast trending reverse, tear, and later block faults during the uplift of Precambrian basement. Ore deposits of the Pima mining district are localized along a northeast trending fault zone with evidence for initial activity in the Middle Jurassic and later reactivation during the Laramide.
dc.language.iso	en_US	en
dc.publisher	The University of Arizona.	en
dc.rights	Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.	en
dc.subject	Geology -- Arizona -- Twin Buttes Mine.	en
dc.subject	Plate tectonics.	en
dc.subject	Geology, Stratigraphic -- Jurassic.	en
dc.subject	Geology -- Arizona -- Pima County.	en
dc.subject	maps
dc.title	Mesozoic tectonic evolution of the Twin Buttes Mine area, Pima County, Arizona: implications for a regional tectonic contro of ore deposits in the Pima mining district	en
dc.type	text	en
dc.type	Thesis-Reproduction (electronic)	en
dc.identifier.oclc	10171651	en
dc.identifier.oclc	10171607	en
thesis.degree.grantor	University of Arizona	en
thesis.degree.level	masters	en
thesis.degree.discipline	Geosciences	en
thesis.degree.discipline	Graduate College	en
thesis.degree.name	M.S.	en
dc.description.note	This item was digitized from a paper original and/or a microfilm copy. If you need higher-resolution images for any content in this item, please contact us at repository@u.library.arizona.edu.	en
dc.identifier.bibrecord	.b14327193	en
dc.identifier.bibrecord	.b14327181	en
dc.identifier.callnumber	E9791 1982 315	en
refterms.dateFOA	2018-09-09T00:43:40Z
html.description.abstract	Ground magnetic data are consistent with the interpretation that Lower Jurassic volcanic rocks of the Twin Buttes mine area (Ox Frame Volcanics) are confined to a distinct block by the northwest trending Sawmill Canyon Fault Zone which was initially active during the Lower Jurassic. Possible reactivation of the Sawmill Canyon Fault zone in the Middle Jurassic as a left-lateral wrench fault is recorded by the deposition of syntectonic red-beds (Rodolfo Formation). Lower Cretaceous rocks (Whitcomb Quartzite, Glance Conglomerate, and Angelica Akrose) were deposited in alluvial environments resulting from additional reactivation of the Sawmill Canyon Fault Zone. Upper Cretaceous (Laramide) deformation involved the formation of northwest trending folds and northwest and northeast trending reverse, tear, and later block faults during the uplift of Precambrian basement. Ore deposits of the Pima mining district are localized along a northeast trending fault zone with evidence for initial activity in the Middle Jurassic and later reactivation during the Laramide.