The internal structure of Seafloor Massive Sulfides (SMS) deposits is one the most important and complex issues facing study modern hydrothermal ore systems. Semenov-5 field a unique area where mass wasting on slope oceanic core (OCC) exposes subsurface portion deposit offers an exceptional opportunity to observe massive sulfides that have formed not only seafloor but in sub-seafloor zones as w...

The Upper Jurassic Mantos Blancos copper deposit (500 Mt at 1.0% Cu), located in the Coastal Range of northern Chile, displays two superimposed hydrothermal events. An older phyllic alteration probably related to felsic magmatic–hydrothermal brecciation at ∼155 Ma, and younger (141–142 Ma) potassic, propylitic, and sodic alterations, coeval with dioritic and granodioritic stocks and sills, and ...

The Paraíba is an Au-Cu-Mo deposit located in the southern part of Amazon Craton, Alta Floresta Mineral Province, Mato Grosso State, Brazil. It composed Au-Cu-bearing quartz veins and Cu-Mo-rich hydrothermal breccias stockworks, both associated with several alteration zones. integration spectral (reflectance imaging spectroscopy) conventional techniques (core logging, petrography, mineral chemi...

Abstract Sub-seafloor hydrothermal processes along volcanically active plate boundaries are integral to the formation of seafloor massive sulfide deposits and oceanic iron cycling, yet nature their relationship is poorly understood. Here we apply isotope analysis minerals from Trans-Atlantic Geotraverse (TAG) mound underlying stockwork, 26°N Mid-Atlantic Ridge, trace inside an actively-forming ...

On April 26, 1996, Public Law 104-134 was Chart 1 .-Payment volume, by type of disbursement, fiscal year 1997 enacted, requiring all Federal payments except tax refunds be issued electronically by January 2, 1999, thus beginning a new era in electronic N Federal tax 10.5% funds transfer (EFT). This legislation, the Debt Collection Improvement Act of 1996-part of the Omnibus Consolidated Resciss...