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Geochemistry and Petrology Research Opportunities at the Homestake Mine
Edward F. Duke
South Dakota School of Mines and Technology
International Workshop on Neutrinos and Subterranean Science
Washington, D.C., Sept. 19-21, 2002
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USGS Bull. 1857-J (1991)
Giant Proterozoic Metamorphic-Hydrothermal System
Research Opportunities:
Unique 3-D “field area” (>40 km3)
Unprecedented vertical sampling (>1 kbar)
Steep metamorphic gradient and ~vertical isograds
Giant hydrothermal quartz-vein system
World-class gold ore body
Interplay of syngenetic and epigenetic mineralization processes
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Regional Tectonics
Research Opportunities:
Transition zone between Wyoming Archean Province and Trans-Hudson Orogenic Belt
Intersection of major basement discontinuities -- active E. Proterozoic(?) through Tertiary
Boundary between Tertiaty alkalic and subalkalic magmatism
0 30 km
Wyoming Archean ~2.5
Ga
Transition Zone?
Trans-Hudson ~1.85 Ga
?
?
USGS Bull. 1857-J (1991)
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Giant Proterozoic Metamorphic-Hydrothermal System
Research Objectives: Characterize tectonic and depositional environment including
nature of unique chemical sedimentary rocks Better age constraints on sedimentation, metamorphism,
hydrothermal system and gold mineralization Refine metamorphic P-T-time model Characterize sources of fluids and metals, and fluid/rock
interactions Involvement of granitic fluids and/or heat source Structural controlsResearch Methods: Stable isotope geochemistry Radiogenic isotope dating and tracer studies Major and trace element geochemistry Fluid inclusion microthermometry, chemistry, and isotopic
composition Metamorphic phase equilibria and thermobarometry
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Geodata Archive and Sample Repository
Underground Science
Experiments
Outreach and Education
Basic Geoscience Research
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Data and Materials Available from Homestake
• Vulcan database providing a complete 3D rendering of mine workings, geologic data for 26,000+ diamond drill holes, geologic plan maps and cross-sections.
• 36,000+ maps and sections of the Homestake mine and the Black Hills.
• Tens of thousands of feet of diamond drill core from documented locations in the mine and the northern Black Hills.
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4850 ft
8000 ft
Open Cut
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