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- W2085362158 abstract "New exploration techniques are vital to the search for new orebodies in mature terranes, as well as for extensions of existing orebodies. This research focused on application of low-temperature dating techniques (primarily apatite fission-tracks) and stable isotope measurements (carbon and oxygen in carbonate rocks) in and around the Pipeline deposit, a Carlin-type gold system. The primary purpose of the project was to assess whether these techniques could provide exploration vectors that might be used in conjunction with other geologic, geochemical, and geophysical techniques to determine the locus of fossil hydrothermal fluid flow, and the attendant possibility of finding economic mineral deposits. At Pipeline, measurements of apatite fission-tracks and (U − Th) / He geochronometry yield a clear indication of the elevated temperatures associated with the fossil hydrothermal system. The pattern is one of a central target (Pipeline deposit) with decreasing thermal effects as far as several kilometers laterally from the known ore zone. Because of the irregular nature of fluid flow through fractures, a significant number of samples are required to discern this pattern, but the pattern is quite clear from the 32 samples in and around the Pipeline pit. Stable isotope measurements of carbonate rocks yield patterns centered on the Pipeline pit area. Oxygen isotopes in particular are shifted toward lower values as the result of interaction between the hydrothermal fluids and carbonate rocks. Carbon isotopes show a pattern, but it is somewhat more difficult to interpret than the oxygen isotope pattern. As with the geochronometric patterns, isotopic indications of fluid flow are present several kilometers from the ore zone at Pipeline. Also as with the geochronometric data, a relatively large sample set is required to see the pattern. At Pipeline, the patterns are evident in approximately 45 surface samples and very clearly in the cross-sections containing approximately 100 samples. From these data, it is clear that thermal and stable isotopic measurements on rocks at a significant distance from the known Pipeline hydrothermal system record the passage of hot fluids through the rock. Both techniques provide a footprint of the Pipeline system that is several diameters larger than the ore zone (as presently known). Therefore, thermochronologic and stable isotopic measurements can be utilized in conjunction with other techniques as part of an overall exploration strategy for Carlin-type deposits. Although these techniques do not provide a direct indication of the metal content of the fossil hydrothermal fluids, they do provide an indication of the robustness of fluid flow and the potential size of a hydrothermal system." @default.
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- W2085362158 date "2006-10-01" @default.
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- W2085362158 title "Thermal and isotopic profiling of the Pipeline hydrothermal system: Application to exploration for Carlin-type gold deposits" @default.
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- W2085362158 doi "https://doi.org/10.1016/j.gexplo.2005.12.005" @default.
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