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- W339866148 abstract "REE, Th, and Sc analyses of samples collected from the Lower Paleozoic Shoo Fly Complex (SFC), northern Sierra terrane, support the hypothesis that the structurally lowest portion of the SFC (i.e., the Lang, Black Oak Spring, and Zion Hill sequences) is primarily composed of continentally derived detritus. Fifteen samples collected from mudstones in and adjacent to the contact aureole of the Middle Jurassic Emigrant Gap composite pluton vary in metamorphic grade from chlorite [+-] white mica slaty argillites outside of the aureole to K-feldspar [+-] sillimanite phyllitic schists adjacent to the pluton. On chondrite-normalized REE distribution diagrams, the samples exhibit (1) no systematic change as a result of increasing contact metamorphic grade, (2) LREE enrichment trends, and (3) Eu anomalies ranging from 0.46 to 0.93, and averaging 0.66. These REE characteristics are like those documented for passive margin turbidites and Post Archean Average Shale (PAAS), and suggest that contact metamorphism did not significantly alter REE distribution. On a La-Th-Sc ternary diagram the authors data cluster in the fields of passive continental margin and PAAS. The average Th/U ratio is 8.8 which strongly implies a recycled and/or weathered source. These new data, coupled with the quartz-rich nature of interbedded sandstones, themore » absence of volcanic material, and previously determined Precambrian detrital zircon ages suggest that clastic detritus within the Lang, Black Oak Spring, and Zion Hill sequences was derived form a cratonal source which may have been the North American continent.« less" @default.
- W339866148 created "2016-06-24" @default.
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- W339866148 date "1993-04-01" @default.
- W339866148 modified "2023-09-23" @default.
- W339866148 title "Provenance discrimination of Paleozoic mudstones within a contact metamorphic aureole determined by REE, Th, and Sc analyses, Sierra Nevada, California" @default.
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