Pb isotope geochemistry of stratabound Zn-Pb(-Ag-Au-Ba-F) deposits and occurrences in the Nome Complex, Seward Peninsula, Alaska: Metal sources and regional comparisons

Robert A. Ayuso; Alison B. Till; John F. Slack; Francesca Forni

doi:10.1130/2014.2506(07)

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GSA Special Papers

Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits

Author(s)

Geological Society of America

Volume

506

DOI:

https://doi.org/10.1130/SPE506

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ISBN print:

9780813725062

Publication date:

July 01, 2014

Book Chapter

Pb isotope geochemistry of stratabound Zn-Pb(-Ag-Au-Ba-F) deposits and occurrences in the Nome Complex, Seward Peninsula, Alaska: Metal sources and regional comparisons

Author(s)

Robert A. Ayuso

U.S. Geological Survey, National Center, MS 954, Reston, Virginia 20192, USA

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;

Alison B. Till

U.S. Geological Survey, 4210 University Drive, Anchorage, Alaska 99508, USA

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;

John F. Slack

U.S. Geological Survey, National Center, MS 954, Reston, Virginia 20192, USA

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;

Francesca Forni

U.S. Geological Survey, National Center, MS 954, Reston, Virginia 20192, USA

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Doi:

https://doi.org/10.1130/2014.2506(07)

Published:

July 01, 2014

A detailed study of the Pb isotope geochemistry of Zn-Pb(-Ag-Au-Ba-F) stratabound sulfide deposits within metasedimentary rocks of the Neoproterozoic to Mississippian(?) Nome Complex provides key information for understanding deposit genesis and crustal evolution. A total of 106 new analyses of galena (and other sulfi des) and metasedimentary rocks hosting the deposits shows that (1) Pb isotope signatures of the deposits are heterogeneous when considered as a group; (2) the stratabound Nelson deposit, and deformed veins at Quarry and Galena, are isotopically similar; (3) stratabound and locally stratiform lenses such as Wheeler North and Aurora Creek had different isotopic evolutions; and...

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Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits

Pb isotope geochemistry of stratabound Zn-Pb(-Ag-Au-Ba-F) deposits and occurrences in the Nome Complex, Seward Peninsula, Alaska: Metal sources and regional comparisons

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