Dissertation/Thesis Abstract

A stable isotope study of fluid-rock interaction in serpentinites of the Franciscan Complex, San Rafael Mountains, California
by Brown, Christine P., M.S., California State University, Long Beach, 2014, 247; 1526895
Abstract (Summary)

The fluid history of serpentinites from three locations in the Franciscan Complex, San Rafael Mountains, California is evaluated with petrologic and stable isotope data that allow interpretation of the serpentinization history and tectonic origin of these rocks. Petrologic evidence shows that most samples were originally serpentinized in a relatively low temperature seafloor hydrothermal environment, but some rocks underwent subsequent recrystallization. Data obtained from serpentine-magnetite geothermometry indicate that the serpentinization temperatures ranged from 168°C to 306°C. Oxygen isotopic values suggest that the serpentinites may have originated in a forearc setting. Hydrogen isotopic values obtained do not reflect the original conditions of serpentinization, but indicate that the rocks subsequently underwent isotopic exchange with meteoric water once they were emplaced onto the continent.

Indexing (document details)
Advisor: Holk, Gregory
Commitee: Francis, Robert D., Grannell, Roswitha B.
School: California State University, Long Beach
Department: Geological Sciences
School Location: United States -- California
Source: MAI 53/06M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Geology, Petrology, Geochemistry
Keywords: Franciscan Complex, Nitrogen isotope, Oxygen isotope, San Rafael Mountains, Serpentinite
Publication Number: 1526895
ISBN: 978-1-321-27695-4
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