首页> 外文期刊>Journal of geophysical research. Solid earth: JGR >Heat flow in vapor dominated areas of the Yellowstone Plateau Volcanic Field: Implications for the thermal budget of the Yellowstone Caldera
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Heat flow in vapor dominated areas of the Yellowstone Plateau Volcanic Field: Implications for the thermal budget of the Yellowstone Caldera

机译:黄石高原火山场中以蒸汽为主的区域中的热流:对黄石火山口热收支的影响

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Characterizing the vigor of magmatic activity in Yellowstone requires knowledge of the mechanisms and rates of heat transport between magma and the ground surface. We present results from a heat flow study in two vapor dominated, acid-sulfate thermal areas in the Yellowstone Caldera, the 0.11km ~2 Obsidian Pool Thermal Area (OPTA) and the 0.25km ~2 Solfatara Plateau Thermal Area (SPTA). Conductive heat flux through a low permeability layer capping large vapor reservoirs is calculated from soil temperature measurements at >600 locations and from laboratory measurements of soil properties. The conductive heat output is 3.6 0.4MW and 7.5 0.4MW from the OPTA and the SPTA, respectively. The advective heat output from soils is 1.3 0.3MW and 1.2 0.3 MW from the OPTA and the SPTA, respectively and the heat output from thermal pools in the OPTA is 6.8 1.4MW. These estimates result in a total heat output of 11.8 1.4MW and 8.8 0.4 MW from OPTA and SPTA, respectively. Focused zones of high heat flux in both thermal areas are roughly aligned with regional faults suggesting that faults in both areas serve as conduits for the rising acid vapor. Extrapolation of the average heat flux from the OPTA (103 2Wm ~(-2)) and SPTA (35 3Wm ~(-2)) to the ~35km ~2 of vapor dominated areas in Yellowstone yields 3.6 and 1.2 GW, respectively, which is less than the total heat output transported by steam from the Yellowstone Caldera as estimated by the chloride inventory method (4.0 to 8.0 GW).
机译:表征黄石中岩浆活动的活力需要了解岩浆和地表之间热传输的机理和速率。我们介绍了在黄石破火山口,0.11km〜2黑曜石池热区(OPTA)和0.25km〜2 Solfatara高原热区(SPTA)的两个以蒸汽为主,酸硫酸盐热区的热流研究结果。通过覆盖> 600个位置的土壤温度测量值和实验室对土壤性质的测量值,可以计算出通过覆盖大型蒸气储层的低渗透性层的传导热通量。 OPTA和SPTA的传导热输出分别为3.6 0.4MW和7.5 0.4MW。 OPTA和SPTA的土壤对流热量分别为1.3 0.3MW和1.2 0.3 MW,OPTA的热库热量为6.8 1.4MW。这些估计导致OPTA和SPTA的总热量输出分别为11.8 1.4MW和8.8 0.4 MW。在两个热区中高热通量的集中区域大致与区域断层对齐,表明这两个区域的断层都作为上升的酸蒸汽的管道。从黄石中的OPTA(103 2Wm〜(-2))和SPTA(35 3Wm〜(-2))的平均热通量推算到约35km〜2的蒸汽占主导的区域,分别产生3.6 GW和1.2 GW。小于氯化物清单法估算的黄石破火山口蒸汽输送的总热量输出(4.0至8.0 GW)。

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