Paula S. Peterson

Michigan Technological University

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i-10 index

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Co-Authors

William I. Rose

Michigan Technological University

Edwin H. McKee

United States Department of the Interior

Gary P. Landis

United States Geological Survey

Thomas A. Vogel

Michigan State University

John W. Drexler

University of Colorado Boulder

Richard Wunderman

Michigan Technological University

Gregory A. Hahn

Michigan Technological University

Norman K. Grant

Benedict College

Donald C. Noble

NHS Lothian

P. A. Jezek

Boston Engineering (United States)

Cooperative Institutions

Michigan Technological University

United States Geological Survey

Denver Federal Center

Columbia University

University of Colorado Boulder

Smithsonian Institution

Dartmouth College

Lamont-Doherty Earth Observatory

United States Department of the Interior

Menlo School

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Quaternary Tephra of Northern Central America

Springer eBooks (1981)

William I. Rose Gregory A. Hahn John W. Drexler MaryAnn L. Malinconico Paula S. Peterson

Silicic

Caldera

Scoria

Dense-rock equivalent

Peléan eruption

Basaltic andesite

Cinder cone

10.1007/978-94-009-8537-7_11

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Citations (21)

Rare-element–enriched, S-type ash-flow tuffs containing phenocrysts of muscovite, andalusite, and sillimanite, southeastern Peru

Geology (1984)

Donald C. Noble Thomas A. Vogel Paula S. Peterson Gary P. Landis Norman K. Grant

Ash-flow tuffs of Neogene age exposed over 2,500 km 2 in the Macusani region of southeastern Peru are the volcanic equivalent of S-type granites. The strongly peraluminous tuffs contain phenocrysts of andalusite, sillimanite, and muscovite and have high 87 Sr/ 86 Sr i (0.7258 and 0.7226) and δ 18 O (+11‰). Elevated concentrations of Li, Cs, Be, Sn, B, and other minor elements compare with those in “tin granites.” Mineral phase relations and composition are indicative of low magmatic temperatures and oxygen fugacities and high a HF/ a H 2 O. The chemical, isotopic, and mineralogical features and regional geologic relations are consistent with models of magma generation involving the incorporation of large amounts of pelitic rock.

Andalusite

Phenocryst

Sillimanite

Muscovite

10.1130/0091-7613(1984)12<35:rsatcp>2.0.co;2

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Citations (56)

Explosive eruptions of the Ayarza calderas, southeastern Guatemala

Journal of Volcanology and Geothermal Research (1985)

Paula S. Peterson William I. Rose

Caldera

Phenocryst