Potassium-argon age and petrography of the Sierra Blanca Peak igneous intrusives Hudspeth County, Texas

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dc.contributor.advisorAdams, John A. S.
dc.contributor.committeeMemberBaker, Donald R.
dc.contributor.committeeMemberBally, Albert W.
dc.creatorMatthews, William K.
dc.date.accessioned2018-12-18T21:18:49Z
dc.date.available2018-12-18T21:18:49Z
dc.date.issued1983
dc.description.abstractRhyolite and diorite intrusives are exposed six miles west of Sierra Blanca (Hudspeth County) in West Texas. StructuraUy, they lie between the relatively undeformed Diablo Platform and the folded and faulted Chihuahua Tectonic Belt (Laramide). In thin sections the rhyolite was homogeneous and the diorite proved more variable in mineralogy. Detailed field mapping (1:24) confirmed the general outlines of the five rhyolite laccoliths described by earlier workers. New details of rhyolite dikes, autobrecciation, and flow banding were recognized. A rhyolite age of 36.1 m.y. was reported by earlier workers. The new mapping documented over fifty previously unreported diorite dikes and sills with a concentrated swarm near Sierra Blanca Peak. A potassium-4/argon-4 age of 88 +4 m.y. from a single hornblende phenocryst from a 3 foot dike in the diorite swarm is the oldest Mesozoic age reported to date in this region. Mineralogical differences between the rhyolite and diorite and the 5 m.y. interval between emplacements increase the probability that they are from unrelated magma sources and different tectonic regimes.
dc.format.digitalOriginreformatted digital
dc.format.extent38 pp
dc.identifier.callnoThesis Geol. 1983 Matthews
dc.identifier.citationMatthews, William K.. "Potassium-argon age and petrography of the Sierra Blanca Peak igneous intrusives Hudspeth County, Texas." (1983) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104205">https://hdl.handle.net/1911/104205</a>.
dc.identifier.digitalRICE1833
dc.identifier.urihttps://hdl.handle.net/1911/104205
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.titlePotassium-argon age and petrography of the Sierra Blanca Peak igneous intrusives Hudspeth County, Texas
dc.typeThesis
dc.type.materialText
thesis.degree.departmentEarth Science
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelMasters
thesis.degree.nameMaster of Arts
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Geology Of The Sierra Blanca Peak Intrusives, Hudspeth County, Texas
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