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首页> 外文会议>Workshop on Geothermal Reservoir Engineering >DATING SINTER DEPOSITS IN NORTHERN DIXIE VALLEY, NEVADATHE PALEOSEISMIC RECORD AND IMPLICATIONS FOR THE DIXIE VALLEY GEOTHERMAL SYSTEM
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DATING SINTER DEPOSITS IN NORTHERN DIXIE VALLEY, NEVADATHE PALEOSEISMIC RECORD AND IMPLICATIONS FOR THE DIXIE VALLEY GEOTHERMAL SYSTEM

机译：Dixie Valley北部北部的烧结沉积物，Nevadathe古姿态记录和迪克西谷地热系统的影响

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A series of fossil spring deposits are exposed along the Dixie Valley fault just south of the producing geothermal field, in an area now characterized by active fumaroles and steaming ground. These deposits are composed of both travertine and sinter that have trapped pollen and other plant material during their formation. Radiocarbon dates on the organic material indicate that the youngest hot spring sinters range in age from about 3.4 ka to essentially modern. Banded travertine composed of calcite, dolomite, hematite, and barite may represent deposition from a warm spring at about 5040 ka. Older quartz-rich sinters are between 3.4 ka and Lake Dixie (11-12 ka) in age. The mineralogy and texture of the opaline sinters are consistent with their young ages. One sinter (with a modern ~(14)C age) consists of botryoidal heads of vitreous, opaline silica or "geyserite" that likely formed from actively spouting eruptions of boiling fluids along the fault zone. X-ray diffraction analyses indicate that the sinter is composed of original opal-A that has not undergone the transition to the more crystalline opal-CT or cristobalite (opal-C). Slightly older (2.2 to 3.4 ka) sinters appear to be admixtures of opal-C or opal-CT, microcrystalline quartz, and calcite. These sinters are predominantly thinly laminated to porous opal-CT, and contain abundant plant remains and clasts of even older microcrystalline quartz sinter.
机译：一系列化石弹簧沉积物沿着生产地热田的南部的Dixie Valley Fault暴露，在现在的一个地区，其特征在于主动纹摩尔和蒸地区。这些沉积物由在形成过程中捕获花粉和其他植物材料的石斑内和烧结组成。有机材料上的radiocarbon是日期，表明最年轻的温泉索特在约3.4 ka到基本上的龄。由方解石，白云石，赤铁矿组成的带状曲线可以代表从温泉沉积在约5040ka的温泉中。年龄较大的石英的戒指介于3.4 ka和Dixie（11-12 ka）之间的年龄。透光症患者的矿物学和质地与他们的年轻年龄符合。一个烧结（具有现代〜（14）c年龄）由玻璃体的玻璃体，透明剂硅胶或“Geyserite”组成，该头部可能由沿着断层区的主动喷射沸腾的沸腾喷发而形成的。 X射线衍射分析表明，烧结蛋白酶A由原始蛋白石-α组成，其没有经历过透明的过渡到更结晶的Opal-CT或C​​ristobalite（OPAL-C）。略大（2.2到3.4 kA）索特斯似乎是Opal-C或Opal-CT，微晶石英和方解石的混合。这些烧结均以聚氯胺薄薄地层压到多孔蛋白-CT，含有丰富的植物残骸和甚至较旧的微晶石英烧结液。

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