Volcanic Stratigraphy of Massacre Rim, Northwest Nevada: Changing Mantle Sources of Mid- to-Late-Tertiary Basalts

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Abstract/Contents

Abstract: At Massacre Rim in Washoe County, NV, exposures of volcanic strata dating from the Oligocene through the Pliocene are present. This stratigraphic succession includes at the lowest exposed level the rhyolitic 26-ma Fortynine Mountain ignimbrite and mafic lavas and associated phreatomagmatic deposits. These Oligocene units are overlain by the 16-ma Summit Lake Tuff and an alkali olivine basalt of presumed mid-Miocene age. Overlying all of them are low-K olivine tholeiitic lavas that have been dated regionally to ~10-0.5 Ma. Though thin, the low-K olivine tholeiite lavas cover an extensive area, blanketing the landscape in northwestern Nevada with flat to shallowly dipping sheets that form broad tablelands.

Type of resource	text
Date created	March 2011

Author	Trugman, Anna Taylor
Primary advisor	Mahood, Gail A.
Advisor	Egger, Anne E.
Degree granting institution	Stanford University, Department of Geological and Environmental Sciences

Subject	School of Earth Energy & Environmental Sciences
Subject	stratigraphic groups
Subject	Nevada
Genre	Thesis

Location	https://purl.stanford.edu/jr790jn8357

Use and reproduction: Theses courtesy of Stanford University Libraries. If you have questions, please contact the Branner Earth Science Library & Map Collections at brannerlibrary@stanford.edu.

Preferred Citation: Trugman, Anna Taylor. (2011). Volcanic Stratigraphy of Massacre Rim, Northwest Nevada: Changing Mantle Sources of Mid- to-Late-Tertiary Basalts. Stanford Digital Repository. Available at: http://purl.stanford.edu/jr790jn8357

Undergraduate Honors Theses, Doerr School of Sustainability

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