The Chemical Composition of Chlorites from Hydrothermal Ore Deposits and its Applicability to Geothermometers
The Chemical Composition of Chlorites from Hydrothermal Ore Deposits and its Applicability to Geothermometers
复制标题
热液矿床中绿泥石的化学成分及其对地温计的适用性
DOI：
10.2473/journalofmmij.124.694
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
H. Maeda
中科院分区：
文献类型：
--
作者：
T. Yoneda;H. Maeda
热液系统中的粘土矿物的组成和结构性质显示出高度的多样性和系统的变化与他们的地方。绿泥石是最常见的粘土矿物之一，其化学组成与其形成环境如地质条件、温度、热液化学性质等有密切关系。这两种地热温度计是Cathelineau的温度计，给出了活跃地热田中地热形成的经验温标，Walshe的温度计给出了基于地热固溶体交换反应的热力学温标。通过对流体包裹体测温方法的比较，认为这两种测温方法可适用于不同成分类型的热液包裹体。Cathelineau的温度计适合于Mg-100，Walshe的温度计适合于Fe-100，表明这两种温度计都可以作为地热储层和热液矿床的找矿标志。此外，必须强调的是，在对绿泥石应用温度计时，应检查温度计中的杂质。
Compositional and structural properties of clay minerals from hydrothermal systems show highly diverse and systematic variations related to their localities. The chemical compositions of chlorite, one of the most common clay minerals, are thought to have a close relationship with its formational environments such as geological conditions, temperature, chemistry of hydrothermal solution, etc. In this study two chlorite geothermometers were considered by using the chemical composition of chlorites from some hydrothermal ore deposits in Japan. The two chlorite geothermometers are the Cathelineau's thermometer giving an empirical temperature scale of chlorite formation in an active geothermal field, and the Walshe's thermometer giving a thermodynamic temperature scale based on exchange reactions of chlorite solid solutions. On the basis of a comparison of fluid inclusion geothermometry, it is concluded that the two geothermometers can be applied to different compositional types of hydrothermal chlorite. The Cathelineau's thermometer fits well for Mg-chlorite, and the Walshe's thermometer fits for Fe-chlorite, indicating that both two chlorite geothermometers can be used as exploration indicators for geothermal reservoirs and hydrothermal ore deposits. In addition, it must be emphasized that the impurities in the chlorite should be examined in applying the chlorite geothermometers to chlorites.