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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Published:July 01, 2014
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Robert A. Ayuso, Alison B. Till, John F. Slack, Francesca Forni, 2014. "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", Reconstruction of a Late Proterozoic to Devonian Continental Margin Sequence, Northern Alaska, Its Paleogeographic Significance, and Contained Base-Metal Sulfide Deposits, Julie A. Dumoulin, Alison B. Till
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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...
- actinides
- Alaska
- concentration
- geochemistry
- host rocks
- isotope ratios
- isotopes
- lead
- metal ores
- metals
- metamorphic rocks
- mineral deposits, genesis
- paleogeography
- Pb-206/Pb-204
- Pb-207/Pb-204
- Pb-207/Pb-206
- Pb-208/Pb-204
- Pb-208/Pb-206
- polymetallic ores
- radioactive isotopes
- reconstruction
- Seward Peninsula
- stable isotopes
- stratabound deposits
- sulfides
- thorium
- United States
- uranium
- western Alaska
- Pb-208/Pb-207
- Nome Complex