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.

与含水岩浆分离的岩浆流体具有高盐度，并包含重金属和气态成分，例如CO_2。岩浆流体被认为是水热矿石沉积的原因。流体中溶解到蒸气相的挥发性成分，而在流体沸腾期间，盐和金属仍处于液相。然而，高浓度的金属有时会在与高温水热系统相关的富含蒸气的液体包含中发现。这种蒸气夹杂物表明，在沸腾的热液系统下金属的行为比以前认为的要复杂。为了阐明沸腾过程中金属的行为，本研究引入了新设计的高温高压灭菌器。确定共存蒸气和液相之间的Cu和Zn分馏，以分析在沸腾条件下合成的流体夹杂物中这些金属的浓度。我们的结果表明，在自然高温水热系统附近偶尔发现的高浓度铜可能被溶解为硫化物络合物。同步加速器X射线荧光被用作分析本研究中各个流体包含的技术。建立了使用已知金属浓度的合成流体夹杂物来构成校正线的定量。还进行了NaCl-CO_2-H_2O中NaCl溶解度的热液实验。对安第斯山脉地区，智利和与接触变质的木质木矿床相关的Manto型Cu沉积物的原产性和性质的研究进行了研究。