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A Preliminary Study on Fluid Inclusions and Mineralization of Xitieshan Sedimentary-Exhalative (SEDEX) Lead-Zinc Deposit

机译:西铁山沉积呼气铅锌矿床流体包裹体与矿化作用的初步研究

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摘要

Xitieshan 铅锌存款在 Qaidam 盆的北边缘被定位, Qinghai 省,中国,并且开发了一个完全的海洋的 sedimentary-exhalative 系统。我们形成矿石的液体的初步的学习证明在从代表管子外形的改变的 stockwork 岩石的石英的液体包括有大量温度和咸度。强烈液体活动是 exhalative 系统的管子外形的特征。在在代表发泄近似的外形的厚床的云石招待的 unstratified 矿石身体附近的碳酸盐的液体包括在尺寸大并且有对高温度中等。他们代表 unerupted sub-seafloor 液体活动。在改变的 stockwork 岩石和碳酸盐中的液体有类似的 H2O-NaCl-CO2 系统,两个都属于 sedimentary-exhalative 系统。液体从管子外形移居到 unstratified 矿石身体。液体沸腾引起 CO2 蒸汽和液体 H2O 的分离。当液体移居进 unconsolidated 时,象进液体的海水的某参与一样的厚床的大理石, CO2 的逃跑,减少的温度和压力与形成矿石的材料的高、低的咸度和免职导致液体的 unmixing。二纯粹的液体在 unconsolidated 碳酸盐被套住,形成矿石的材料在 unconsolidated 碳酸盐被扔形成 sedimentary-exhalative 类型 unstratified 矿石身体。unstratified 矿石身体的形成矿石的温度直到显示在有一个巨大的形成矿石的潜力的高温度它的深。
机译:The Xitieshan lead-zinc deposit is located at the northern margin of the Qaidam Basin,Qinghai Province, China, and had developed a complete marine sedimentary-exhalative system. Ourpreliminary study of ore-forming fluids shows that fluid inclusions in quartz from altered stockworkrocks that represent the pipe facies have a wide range of temperature and salinity. The intense fluidactivities are characteristics of the pipe facies of the exhalative system. Fluid inclusions in carbonatesnear the unstratified ore bodies hosted in the thick-bedded marble which represents vent-proximalfacies are large in size and have moderate to high temperatures. They represent unerupted sub-seafloorfluid activity. Fluids in altered stockwork rocks and carbonates have similar H2O-NaCl-CO2 system,both belonging to the sedimentary-exhalative system. The fluids migrate from the pipe facies to theunstratified ore bodies. Boiling of the fluids causes the separation of CO2 vapor and liquid H2O. Whenthe fluids migrate into the unconsolidated thick-bedded marble, the escape of CO2, decreasingtemperature and pressure as well as some involvement of seawater into the fluids result in the unmixingof fluids with high and low salinity and deposition of ore-forming materials. The two unmixed fluids were trapped in unconsolidated carbonates and the ore-forming materials were deposited in theunconsolidated carbonates to form the sedimentary-exhalative type unstratified ore bodies. The ore-forming temperature of unstratified ore bodies is up to high temperature indicating that there is a hugeore-forming potential in its deep.

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