Geothermal mineralization. I. The mechanism of formation of the Beowawe, Nevada, Siliceous sinter deposit
Geothermal mineralization. I. The mechanism of formation of the Beowawe, Nevada, Siliceous sinter deposit
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地热成矿作用。
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
D. Cole
中科院分区：
文献类型：
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作者：
J. Rimstidt;D. Cole
内华达州贝奥瓦韦的硅质烧结存款，具有7.71 × 10/sup 7/ m/sup 3/的体积，并含有1.28 × 10/sup 11/ kg二氧化硅。这些二氧化硅是从地热溶液中沉淀出来的，这些地热溶液沿着马尔佩斯断层（一个地堑边界断层）向上流动。烧结成型分为三个步骤。(1)在储层中被石英饱和的GeO 2溶液移动到表面，在那里它们冷却并被无定形二氧化硅过饱和。(2)无定形二氧化硅颗粒成核（非均匀地）以产生胶体悬浮液。(3)无定形二氧化硅颗粒团聚并通过沉淀在颗粒之间的海湾中的无定形二氧化硅粘合在一起。至少5.58 x 10/sup 14/ kg的地热溶液必须随着时间的推移产生，以说明贝奥瓦存款中的二氧化硅质量。这种流体将携带至少4.95 x 10/sup 17/ kJ的热量到表面。参考文献21篇，图6幅，表1张。
The siliceous sinter deposit at Beowawe, Nev., has a volume of 7.71 x 10/sup 7/ m/sup 3/ and contains 1.28 x 10/sup 11/ kg silica. This silica precipitated from geothermal solutions that welled-up along the Malpais Fault, a graben bounding fault. Sinter formation involved three steps. (1) Geothermal solutions saturated with quartz in the reservoir moved to the surface where they cooled and became supersaturated with amorphous silica. (2) Amorphous silica particles nucleated (heterogeneously) to produce a colloidal suspension. (3) The amorphous silica particles agglomerated and were cemented together by amorphous silica precipitating in the embayments between the particles. At least 5.58 x 10/sup 14/ kg of geothermal solution must have been produced over time to account for the mass of silica in the Beowawe Deposit. This fluid would have carried at least 4.95 x 10/sup 17/ kJ of heat to the surface. 21 references, 6 figures, 1 table.