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首页> 美国政府科技报告 >Investigations of the Thermal Evolution of Sedimentary Basins Using sup 40 Ar/ sup 39 Ar Thermochronology: Applications to Petroleum Exploration: Final Report, September 1, 1982 to March 31, 1987
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Investigations of the Thermal Evolution of Sedimentary Basins Using sup 40 Ar/ sup 39 Ar Thermochronology: Applications to Petroleum Exploration: Final Report, September 1, 1982 to March 31, 1987

机译：使用sup 40 ar / sup 39 ar热年代学研究沉积盆地的热演化：应用于石油勘探：最终报告，1982年9月1日至1987年3月31日

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Our work has demonstrated the potential of sup 40 Ar/ sup 39 Ar age spectrum analysis of detrital microclines in revealing thermochronological information. By irradiating feldspars with a known dose of fast neutrons, and isotopically distinct but chemically identical form of the daughter ( sup 39 Ar) is produced from potassium, making the sup 40 Ar/ sup 39 Ar ratio of a geological sample implicitly proportional to age. If the sample has experienced heating in the temperature range approx.100 deg to 200 deg C for geological time, the transport kinetics of sup 40 Ar in microcline are sufficiently rapid to cause partial outgassing of the sample which can be revealed during analysis. Given that we can obtain sample intensive diffusion parameters as a by-product of the experiment, a partially outgassed K-spar can yield information related to both the ages of crystallization and reheating as well as the temperature of the heating event. Detrital microcline separates analyzed from deep drill cores from a variety of basins yield encouraging results and demonstrate the utility of this approach - especially when combined with results from apatite fission track analyses. In summary, sup 40 Ar/ sup 39 Ar analysis of detrital microcline crystals can yield thermochronologic information in the temperature-time range of petroleum maturation and provides this technique with potential, as both a useful exploration tool, and as a means of probing the fundamental geodynamic processes of sedimentary basin evolution. (ERA citation 12:044217)

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