Significance of K-Ar Ages of Tertiary Rocks from the Lake Mead Region, Nevada-Arizona

Anderson, R. Ernest; Longwell, Chester R.; Armstrong, R. L.; Marvin, Richard F.

doi:10.1130/0016-7606(1972)83[273:sokaot]2.0.co;2

Cited by 88 publications

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“…The northern Colorado River extensional corridor of the southern Basin and Range province is a 50 to100 km wide structural terrane that was subjected to severe extensional tectonism during the mid-Tertiary (approximately 184.7 Ma) (Anderson et al, 1972;Duebendorfer and Smith, 1991;Faulds et al, 1992;) (Fig. 3).…”

Section: History Of Extensionmentioning

confidence: 99%

“…Eruption of the Tuff of Bridge Spring was coeval with intense crustal extension in the structurally-complex northern Colorado River extensional corridor of southern Nevada and northwestern Arizona. The timing of the emplacement of the Tuff of Bridge Spring, its widespread distribution, and distinctive lithology makes it a key stratigraphic reference horizon on which correlations.of Miocene-aged stratigraphic units and tectonic reconstructions in the northern Colorado River extensional corridor are based (Anderson, 1971;Anderson et al, 1972;Smith, 1982;Davis, 1984;Schmidt, 1987;Faulds, 1989;Cascadden, 1991;and Bridwell, 1991). The complex nature of these stratigraphic correlations and tectonic reconstructions kquire that correlation and identification of the Tuff of Bridge Spring are based on reliable parameters.…”

Section: Introductionmentioning

confidence: 99%

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Center for Volcanic and Tectonic Studies: 1992--1993 annual report

1994

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Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The Views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. ORGANIZATION OF THE ANNUAL REPORT OF THE CENTER FOR VOLCANIC & TECTONIC STUDIES (CVTS)(sections separated by colored paper) INTRODUCTION CVTS Activities CVTS Staff CVTS Bibliography-1993-1994 Future Directions CONTRIBUTION OF E.I. SMITH PaperThe role of the mantle during crustal extension: constraints from the geochemistry of volcanic rocks in the Lake Mead area: Nevada and Arizona (Reprint from December '93 Geological Society of America Bulletin) . Abstracts of presentations CONTRIBUTION OF T.K. BRADSHAWPaper Polygenetic volcanism at Crater Flat, Nevada (Manuscript in review for publication in the Journal of Volcanology and Geothermal Research)Further Geochemical modeling: Crater Flat. PaperBasaltic volcanism in the southern Bash and Range: no role for a mantle plume.(Reprint from Earth and Planetary Sciences Letters) Abstracts of presentations Data tables for chemical analyses Final thoughts CONTRIBUTION OF G.M. YOGODZINSKI:Summary of CVTS efforts in the Reveille Range, south-central Nevada PaperMagmatism and tectonic development of the western Aleutians: an oceanic arc in a strikeslip setting.(Reprint of paper published in the July '93 Journal of Geophysical Research) Abstracts of presentations CONTRIBUTION OF S.A. MORIKAWA Masters of Science ThesisThe Geology of the Tuff of Bridge Spring: Southern Nevada and Northwestern Arizona.".. INTRODUCTIONThe annual report of the Center for Volcanic Studies (CVTS) contains a series of papers, reprints and a Master of Science thesis that review the progress made by the CVTS between October 1,1992 and February 1,1994. During this period CVTS staff focused on several topics that have direct relevance to volcanic hazards related to the proposed high-level nuclear waste repository at Yucca Mountain, Nevada. These topics include:(1) PoIygenetic/polycyclic volcanism in Crater Flat, Nevada(2) The role of the mantle during crustal extension.(3) The detailed geology of Crater Flat, Nevada.(4) Pliocene volcanoes in the Reveille Range, south-central Nevada.(5) Estimating the probability of disruption of the proposed repository by volcanic eruptions. This topic is being studied by Dr. C.H. Ho at UNLV. CVTS ActivitiesCVTS staff presented papers at several professional meetings including:(a) International Associati...

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Section: History Of Extensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Center for Volcanic and Tectonic Studies: 1992--1993 annual report

1994

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“…These rocks range in age from 4.64 to 4.3 Ma (Feuerbach et al, 1991;Anderson et al, 1972) YAB occurs in three locations: a diatreme at Petroglyph Wash, en-echelon dikes and a vent along US. highway 93, about 10 km south of Hoover Dam, and south of Saddle Island between the North Shore road and Lake Mead (Figure 2) (Smith, 1984).…”

Section: Instrumental Techniquesmentioning

confidence: 99%

Center for volcanic and tectonic studies, Department of Geoscience, Univ. of Nevada, Las Vegas, NV. Annual report No. 69, October 1, 1991--September 30, 1992

Smith¹

1992

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INTRODUCTIONThe annual report of the Center for Volcanic and Tectonic Studies (CVTS) contains a series of papers, maps, and reprints that review the progress made by the CVTS between October 1,199 1 and December 3 1,1992. During this period CVTS staff focused on several topics that had direct relevance to volcanic hazards related to the proposed high-level nuclear waste repository at Yucca Mountain, Nevada. These topics included:(1) The role of the mantle during regional extension.(2) The structural controls and emplacement mechanisms of Pliocene/Quaternary basaltic centers and dikes.(3) The detailed geochemistry of individual volcanic centers in Crater Flat, Nevada.(4) Estimating the probability of disruption of the proposed repository by volcanic eruption (this topic is being studied by Dr. C-H. Ho at UNLV). Activities CVTS Organization of the Annual ReportThis report includes the following contributions: Martin (CVTS-UNLV).Activities of Tim Bradshaw; October 1, 1992 to December 30,1992.Copies of abstracts submitted by CVTS staff during the year of funding.These include:(a) "New insights on structural controls and emplacement mechanisms of Pliocene/Quaternary basaltic dikes, southern Nevada and northwestern Arizona" by ABSTRACI-One of the fundamental questions in areas. of large-magnitude extension and magmatism is the role of the mantle in the extension process. The Lake Mead area is ideally suited for developing models that link crustal and mantle processes because it contains both mantle and crustal boundaries and it was the site of large-magnitude crustal extension and magmatism during Miocene time. In the Lake Mead area, the boundary between the amagmatic zone and the northern Colorado River extensional corridor (NCREC) parallels the Lake Mead fault system (LMFS) and is situated just to the north of Lake Mead. This boundary formed between 11 and 6 Ma during and just following the

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“…T.12 N. Gilluly and Masursky (1965) for valleys in the Cortez area to the north, by for valleys in northwestern Nevada, by Ekren, Rogers, Anderson, and Orkild (1968) in the Nevada Test Site to the south-southeast, and by Anderson, Longwell, Armstrong, and Marvin (1972) and Anderson (1971a) for valleys in the Lake Mead area in the southern part of the Great Basin. We concur with Stewart (1971), who suggested that most basin-and-range structure in central Nevada is late Cenozoic in age and probably is younger than 17 m.y.…”

Section: °30'mentioning

confidence: 99%

Journal of Research of the U. S. Geological Survey, 1974, volume 2, issue 1

1974

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Significance of K-Ar Ages of Tertiary Rocks from the Lake Mead Region, Nevada-Arizona

Cited by 88 publications

References 0 publications

Center for Volcanic and Tectonic Studies: 1992--1993 annual report

Center for Volcanic and Tectonic Studies: 1992--1993 annual report

Center for volcanic and tectonic studies, Department of Geoscience, Univ. of Nevada, Las Vegas, NV. Annual report No. 69, October 1, 1991--September 30, 1992

Journal of Research of the U. S. Geological Survey, 1974, volume 2, issue 1

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