Alteration of mantle peridotite in the Samail ophiolite forms secondary minerals, mainly serpentine and Mg-rich carbonates. Magnesium accounts for ?25 – 30% mass its mobility can be used to trace this alteration. We report first set Mg isotope measurements from peridotites their alteration products Oman. Partially serpentinized have ratios that are indistinguishable estimates average bulk silic...

PRESSURE AND TEMPERATURE CONDITIONS S. P. Schwenzer 1 , M. A. Bullock 2 , J. C. Bridges 3 , C. L. Chavez 4 , J. Filiberto 5 , L. J. Hicks 3 , S. P. Kelley 1 , M. A. Miller 6 , J. M. Moore 4 , H. D. Smith 4 , T. D. Swindle 7 , A. H. Treiman 8 – 1 The Open University, Walton Hall, Milton Keynes MK7 6AA, UK; 2 Southwest Research Institute, 1050 Walnut St., Suite 300, Boulder, CO 80302 (bullock@bou...

Remote sensing plays an important role in mineral exploration. One of its proven applications is extracting host-rock lithology and alteration zones that are related to porphyry copper deposits. An Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) was used to map the Baogutu porphyry deposit alteration area. A circular alteration mineral zoning pattern was clearly observed ...

The evolution of fluid chemistry and mineral alteration around a potential waste emplacement tunnel (drift) is evaluated using numerical modeling. The model considers the flow of water, gas, and heat, plus reactions between minerals, CO(2) gas, and aqueous species, and porosity-permeability-capillary pressure coupling for a dual permeability (fractures and matrix) medium. Two possible operating...

Introduction: Numerous studies over the past decade have demonstrated that microbial life rapidly colonizes terrestrial subaqueous volcanic glass [1-5]. Evidence for microbial alteration of terrestrial subaqueous volcanic rocks has been reported from modern ocean crust, ophiolites, and Archean greenstone belts [1-5]. Microbial alteration structures with characteristic granular and tubular morph...

The study area is located ~50 km in the north of Tehran capital city, Iran, and is a part of central Alborz Mountain. The intrusive bodies aged post Eocene have intruded in the Eocene volcanic units causing hydrothermal alterations in these units. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images were used to map hydrothermal alteration zones. The propylitic, phyllic...

The Great Basin of the Western United States has thin continental crust and geologic structures that have controlled the emplacement of significant precious and base metal mineralization. Many of the mineral deposits in the Great Basin were emplaced by hydrothermal processes that altered the mineralogy of their host rock assemblages and facilitated concentration of metals. In the 1960’s and 197...

The formation of large tin-tungsten (Sn-W) deposits around granitic intrusions requires the circulation volumes fluids within permeable structures. Half world’s tungsten production originates from highly mineralized veins above and altered part granite (the greisen), whose results intense fluid-rock interactions. During greisenization processes, mineral reactions involve a decrease in rock volu...