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Dissertation/Thesis Abstract

A stable isotope study of fluid-rock interactions in the Saddlebag Lake Roof Pendant, Sierra Nevada, California
by Lojasiewicz, Iwo, M.S., California State University, Long Beach, 2016, 168; 10161775
Abstract (Summary)

Saddlebag Lake Pendant (SLP), a zone of hydrothermally-altered, Ordovician-Cretaceous metasedimentary and metavolcanic rocks intruded by the Cretaceous Tuolumne Intrusive Complex (TIC) in California’s Sierra Nevada, was deformed by the Cretaceous Sierra Crest Shear Zone (SLSZ). Unlike other Sierra Nevada pendants, both δ18O and δD values from SLP show great variability, with most samples in isotopic disequilibrium. Mineral δ 18O and δD values range from –1.5‰ to +16.1‰ and –140‰ to –67‰, respectively. All TIC isotopic compositions indicate normal magmatic values. Most Paleozoic units record internally-generated metamorphic fluids. Jurassic metasedimentary and Triassic metavolcanic rocks have great isotopic variability with calculated fluid δ 18O and δD values that range from –2.6‰ to +15.2‰, and –106‰ to –25‰, respectively. All low isotope values are from the SLSZ at Sawmill Canyon. Isotopic data suggests these units were affected by magmatic waters generated by TIC crystallization, and subjected to localized infiltration of meteoric-hydrothermal fluid at Sawmill Canyon.

Indexing (document details)
Advisor: Holk, Gregory J.
Commitee: Kelty, Thomas K., Paterson, Scott R.
School: California State University, Long Beach
Department: Geological Sciences
School Location: United States -- California
Source: MAI 56/01M(E), Masters Abstracts International
Subjects: Geology, Geochemistry
Keywords: Fluid-rock, Isotope, Rock, Saddlebag LOake Roof Pendant, Sierra Nevada, CA, Stable
Publication Number: 10161775
ISBN: 978-1-369-16637-8
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