Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Hydrothermal deposits"”.
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Noble gases anomalies in terrestrial ores and meteorites
… tellurium content allow the age determination of hydrothermal deposits of tellurium by the ¹³⁰Te-¹³⁰Xe dating method. The ages of three telluride samples obtained by this new dating technique agree with geologic age estimates. Application of the neutron irradiation method of ¹²⁹I-¹²⁹Xe dating to …
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The igneous petrology, thermal history, and genesis of sedimentary rock-hosted Au deposits in the northern Battle Mountain mining district, Nevada
… mining district in north-central Nevada hosts deposits of magmatic-hydrothermal origin, including porphyry, skarn, and distal disseminated deposits, as well as sedimentary-rock hosted Au deposits of uncertain origin. This dissertation examines the ages of magmatism and mineralization in the …
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The seismic attenuation structure of the East Pacific Rise
… that such variations in porosity may result from hydrothermal activity. Regions of hydrothermal downwelling located off-axis will be subject to cooling and thermally-induced cracking while upwelling regions on-axis may be accompanied by rapid infilling of existing pores by hydrothermal deposits. …
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Geothermal processes at the Galapagos Spreading Center
… models. The intrusion process and associated hydrothermal circulation dominate the surface heat flow pattern, with circulation apparently continuing beyond the limits of our survey. The areal average of the conductive heat flux is 7.1 ± .8 HFU (295± 33 mW/m2), about one-third the heat flux …
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The hydrothermal alteration of oceanic basalts by seawater
… temperatures. The mineralogy and chemistry of hydrothermally altered pillow basalts dredged from the Mid-Atlantic Ridge, and belonging to the greenschist facies, have been studied in order to determine the mineralogical changes that result from hyrdrothennal alteration, and to assess the …