Petrology of the Lower Arroyo Penasco (Mississippian), Taos County, New Mexico

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dc.contributor.advisorNot available
dc.creatorWilliamson, Turner Franklin
dc.date.accessioned2017-02-20T15:55:55Z
dc.date.available2017-02-20T15:55:55Z
dc.date.issued1979
dc.description.abstractThe Lower Arroyo Penasco, which is probably of Mississippian age, is a relatively thin elastic unit composed of medium-and coarse-grained sand and gravel. It rests on a topographically irregular Precambrian crystalline basement or its regolith and grades conformably upward into a complex carbonate sequence. Nowhere in the studied field area does the lower part of the formation exceed fifteen meters in thickness. The dominant mineral is quartz which comprises over 95% of the framework material, thus making the sandstone categorically a quartzarenite. The unit was deposited within 10° or 15° of the Mississippian equator in a marginal system of high-energy braided streams, beaches, and tidal flats. This system alternately underwent periods of monsoonal flooding and aridity. An authigenic suite of minerals began forming soon after deposition and an episode or episodes of grain embaying and solution fracturing. Large amounts of quartz first precipitated as overgrowths. A complex assemblage of minerals including illite, chlorite, calcite, dolomite chert, chalcedony, pyrite, and apatite then followed, not necessarily in the preceding order. Microcline, which in some areas may have comprised 5% of the sandstone was replaced by illite, chlorite, or calcite; some may have been weathered and leached out of the system. There is practically no porosity. This sandstone with very few fossils grades into a calcitic, dolomitic, and dedolomitic carbonate unit, the Upper Arroyo Penasco.en_US
dc.description.departmentEarth and Planetary Sciencesen_US
dc.format.mediumelectronicen_US
dc.identifierdoi:10.15781/T2S756Q5T
dc.identifier.urihttp://hdl.handle.net/2152/45717
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionOpenen_US
dc.subject.lcshPetrology--New Mexico--Taos County
dc.subject.lcshSandstone--New Mexico--Taos County
dc.subject.lcshGeology--New Mexico--Taos County
dc.titlePetrology of the Lower Arroyo Penasco (Mississippian), Taos County, New Mexicoen_US
dc.title.alternativePetrology of the Arroyo Penasco (Mississippian), Taos County, New Mexicoen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentGeological Sciencesen_US
thesis.degree.disciplineGeology/Geological Sciencesen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US

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