Dissertation/Thesis Abstract

Ancient sedimentary fill of the Waucobi Lake Beds as an archive owens valley, California tectonics and climate
by De Masi, Conni L., M.S., California State University, Long Beach, 2013, 105; 1527312
Abstract (Summary)

The Waucobi Lake Beds in Owens Valley, California contain two distinct facies representing saline-alkaline and fresh water environments. The potential cause for the change in lacustrine facies is examined through geomorphic, geochemical and sedimentological analyses. An age range for the lake beds was constrained with the dating and “fingerprinting” of 13 tuffs throughout the Waucobi Lake Bed exposures. 40Ar/39Ar dating completed for this study provides ages of 2.63 to 2.06 Ma for tuff layers found within the lake beds, with the transition from saline-alkaline facies to fresh water facies occurring around 2.5-2.4 Ma. Regional climate during the late Pliocene-early Pleistocene is reflected by the saline-alkaline environment within Waucobi. However, the Waucobi environment deviates from regional climate after 2.5 Ma, implying that the fresh water facies represents a change in lacustrine hydrology. Given the coincidence between a prominent seismite recorded in the lake beds with the facies change, tectonic activity rather than climate is postulated as the cause for the transition in the lake environment.

Indexing (document details)
Advisor: Stevens, Lora R.
School: California State University, Long Beach
School Location: United States -- California
Source: MAI 52/05M(E), Masters Abstracts International
Subjects: Geology, Sedimentary Geology, Geochemistry
Publication Number: 1527312
ISBN: 978-1-303-76587-2
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