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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Woodlawn
Syn- and post-tectonic mineralization in the Woodlawn Deposit, New South Wales, Australia Available to Purchase
Woodlawn Zn-Pb-Cu sulfide deposit, New South Wales, Australia; an interpretation of ore formation from field observations and metal zoning Available to Purchase
Mercury distribution in the Woodlawn massive sulfide deposit, New South Wales Available to Purchase
Dihedral angle profile for galena, 𝛉 gn , in the Woodlawn ore from N.S.W. Available to Purchase
Organic Molecules and Volatiles in Comets Available to Purchase
AGE OF HOST ROCKS AT THE COLES HILL URANIUM DEPOSIT, PITTSYLVANIA COUNTY, VIRGINIA, BASED ON ZIRCON U-Pb GEOCHRONOLOGY Available to Purchase
Geology of the Coles Hill uranium deposit, Virginia Piedmont Available to Purchase
Abstract The Coles Hill uranium property is located in Pittsylvania County, Virginia, within the Smith River allochthon in Southside Virginia's Western Piedmont Province. The Coles Hill property is bounded on the east by the listric normal Chatham fault at the Triassic Danville basin. Uranium mineralization occurs in the footwall of the Chatham fault and is hosted in healed fractures and in hydrothermal apatite in the Leatherwood granite mylonite that is intruded by the Rich Acres gabbro amphibolite. The granite is silica depleted. The mylonite is foliated with a strike of 030° and dips 30°SE; the Chatham fault strikes 030° and dips 60°SE. The structural trap for uranium mineralization is contained on the east by the Chatham fault and beneath by unmineralized Leatherwood biotite gneiss, which is underlain by the Fork Mountain schist. Hematite staining of the ground surface is from weathering of Fork Mountain schist, which outcrops west of the Chatham fault at a constant distance of half a kilometer. In the southern property, pods of uranium mineralization plunge south at 45°. In the northern property, pods of uranium mineralization plunge northeast at 12°. Saussurite, rapakivi textures, Na- and K-metasomatism, titanite, zircon, apatite, calcite, and hematite are present. One possible uranium source is remobilization from the Triassic basin by westward-flowing meteoric waters that intersected the Chatham fault at depth and migrated upward and laterally into the Leatherwood granite. Another uranium source model may be introduction of uranium mineralization by hydrothermal fluids associated with emplacement and cooling of the Leatherwood granite. These fluids would have migrated upward into a structural trap where uranium minerals were precipitated in hydrothermal fractures.