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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Cooling and welding history of the Bishop Tuff in Adobe Valley and Chidago Canyon, California
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Cooling and welding history of the Bishop Tuff in Adobe Valley and Chidago Canyon, California

机译：加利福尼亚Adobe谷和Chidago峡谷的Bishop Tuff的冷却和焊接历史

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A numerical model for cooling and welding of ash-flow tuffs was developed to obtain a quantitative understanding of the welding compaction that occurs during the cooling of ash-flow sheets and to evaluate the relative effects of emplacement temperature, thickness, and emplacement histories on compaction zonation (density profiles) of large ash-flow sheets. This model includes a set of two-phase, compressible Navier-Stokes equations for the transport of mass, momentum, and energy for a variable density volatile outfluxing through a porous media (ash-flow tuff). With this model we calculated theoretical compaction profiles (density vs. elevation) to match actual data measured in sections of Bishop Tuff. Compaction profiles from the Adobe basin indicate that there were 3 periods of non-deposition (5, 10, and 40 days) separating 4 distinct rapidly emplaced packets (REP) of pyroclastic flow deposition. In contrast, the 3 periods of quiescence (400, 20, and 800 days) between the 4 REPs in Chidago Canyon were considerably longer. These data constrain models of eruption for the Bishop Tuff by implying an eruption cycle that lasted longer than 3 years. The average calculated deposition temperatures for all 4 REPs in the Adobe basin are fairly uniform at 667+33℃. In Chidago Canyon two of the REPs had a higher deposition temperature (～660℃) than the other two (534℃).
机译：建立了灰烬凝灰岩冷却和焊接的数值模型，以定量了解在灰烬流片冷却期间发生的焊接压实度，并评估贴装温度，厚度和贴装历史对压实的相对影响大灰流板的分区（密度分布图）。该模型包括一组两相，可压缩的Navier-Stokes方程组，用于质量，动量和能量的传输，用于通过多孔介质（灰流动凝灰岩）流出的可变密度挥发性挥发物。使用该模型，我们计算了理论压实曲线（密度与高程），以匹配在Bishop Tuff中测量的实际数据。来自Adobe盆地的压实剖面表明，存在3个非沉积期（5、10和40天），将4个截然不同的快速放置的火山碎屑流沉积包裹（REP）分开。相反，Chidago Canyon的4个REP之间的3个静止期（400、20和800天）要长得多。这些数据通过暗示持续超过3年的喷发周期来约束Bishop Tuff的喷发模型。 Adobe盆地中所有4个REP的平均计算沉积温度在667 + 33℃时相当均匀。在Chidago峡谷中，两个REP的沉积温度（〜660℃）比其他两个（534℃）高。

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