Alaska Science Center

U.S. Geological Survey
Professional Paper 1732-E

Oceanic Pb-Isotopic Sources of Proterozoic and Paleozoic Volcanogenic Massive Sulfide Deposits on Prince of Wales Island and Vicinity, Southeastern Alaska

By Robert A. Ayuso, Susan M. Karl, John F. Slack, Peter J. Haeussler, Peter E. Bittenbender, Gregory A. Wandless, and Anna S. Colvin

2007

Figure 1 is a simplified multicolored geologic map of southern Prince of Wales Island and vicinity in southeastern Alaska, showing the locations of volcanogenic massive sulfide deposits and occurrences. The upper right-hand corner of the map is at latitude 55 degrees 30 minutes north, longitude 132 degrees west. Colored areas indicate the locations of Mesozoic, Paleozoic, and Upper Proterozoic plutons and stratified rocks (Silurian and younger strata, undivided; the Silurian through Ordovician Descon Formation; the Lower Silurian through Ordovician Moira Sound unit and correlatives; and the Cambrian through Upper Proterozoic Wales Group), as well as the locations of sites of volcanogenic massive sulfide deposits and occurrences in the Wales Group and the Moira Sound unit, of sites of stratabound barite in the Wales Group deposit, and of high-angle and thrust faults. The figure caption follows...
Simplified geologic map of southern Prince of Wales Island and vicinity, showing locations of volcanogenic massive sulfide deposits and occurrences (from Slack and others, this volume). Geology from S.M. Karl and others (unpub. data, 2006). Deposits and occurrences: see Figure 1 for explanation.

Abstract

Volcanogenic massive sulfide (VMS) deposits on Prince of Wales Island and vicinity in southeastern Alaska are associated with Late Proterozoic through Cambrian volcanosedimentary rocks of the Wales Group and with Ordovician through Early Silurian felsic volcanic rocks of the Moira Sound unit (new informal name). The massive sulfide deposits in the Wales Group include the Big Harbor, Copper City, Corbin, Keete Inlet, Khayyam, Ruby Tuesday, and Stumble-On deposits, and those in the Moira Sound unit include the Barrier Islands, Moira Copper, Niblack, and Nichols Bay deposits.

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