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BEHAVIOR OF METALS DURING FORMATION OF BASE METAL DEPOSITS

贱金属矿床形成过程中金属的行为

基本信息

批准号：
15340182
负责人：
HAYASHI Ken-ichiro
金额：
$ 10.43万
依托单位：
UNIVERSITY OF TSUKUBA (2004-2005)Tohoku University (2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Magmatic fluid separated from hydrous magma has high salinity, and contains heavy metals and gaseous components such as CO_2. Magmatic fluids are believed to be responsible for the formation of hydrothermal ore deposits. Volatile components dissolved in fluid move into vapor phase, while salts and metals remain in liquid phase during boiling of fluids. However, metals of high concentration are occasionally found in vapor-rich fluid inclusion associated with high temperature hydrothermal system. Such vapor inclusions suggest that the behavior of metals under boiling hydrothermal system is more complex than it has been believed. In order to clarify the behavior of metals during boiling, newly designed high temperature autoclave was introduced in this study. Fractionation of Cu and Zn between coexisting vapor and liquid phases was determined to analyze concentration of these metals in fluid inclusions synthesized under boiling condition. Our result suggests that high concentration of copper occasionally found in vicinity of natural high temperature hydrothermal system is probably dissolved as sulfide complex. Synchrotron X-ray fluorescence was used as a technique to analyze individual fluid inclusion in present study. The quantification of this methodology was established to make up correction lines using synthetic fluid inclusions of known concentrations of metals. Hydrothermal experiments on the solubility of NaCl in the system NaCl-CO_2-H_2O were also conducted. Studies on the origin and nature of ore-forming fluid of the manto-type Cu deposit at the Andes area, Chile, and those of metamorphic water associated with contact metamorphosed bedded manganese deposit were conducted.

从含水岩浆中分离出来的岩浆液盐度高，含有重金属和CO_2等气态成分。人们认为岩浆流体是热液矿床形成的原因。溶解在流体中的挥发性成分进入气相，而盐和金属在流体沸腾期间保持在液相中。然而，在与高温热液系统相关的富蒸气流体包裹体中偶尔会发现高浓度的金属。这种蒸气夹杂物表明金属在沸腾热液系统下的行为比人们想象的更复杂。为了阐明金属在沸腾过程中的行为，本研究引入了新设计的高温高压釜。测定共存气相和液相之间的铜和锌的分馏，以分析这些金属在沸腾条件下合成的流体包裹体中的浓度。我们的结果表明，在天然高温热液系统附近偶尔发现的高浓度铜可能以硫化物络合物的形式溶解。在本研究中，同步加速器 X 射线荧光被用作分析单个流体包裹体的技术。建立该方法的量化是为了使用已知金属浓度的合成流体夹杂物来构成校正线。还对NaCl-CO_2-H_2O体系中NaCl的溶解度进行了水热实验。对智利安第斯地区曼托型铜矿床和接触变质层状锰矿床伴生的变质水的来源和性质进行了研究。