| 新疆哈图金矿床中不同类型黄铁矿的成因研究及其矿床学意义 |
| Received:December 21, 2013 Revised:April 23, 2014 点此下载全文 |
| 引用本文：WANG Lei,ZHU YongFeng.2014.Different types of pyrites in Hatu gold deposit, Xinjiang：Origin and ore deposit significance[J].Mineral Deposits,33(3):575~595 |
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| Author Name | Affiliation | E-mail | | WANG Lei | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Science, Peking University, Beijing 100871, China | | | ZHU YongFeng | Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Science, Peking University, Beijing 100871, China | yfzhu@pku.edu.cn |
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| 基金项目:本文为国家自然科学基金项目（编号：41121062、41372062）和国际科技合作项目（2010DFB23390）资助的成果 |
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| 中文摘要:新疆哈图金矿床存在2种成因的黄铁矿,沉积成因的草莓状或细粒黄铁矿与热液成因黄铁矿。草莓状黄铁矿富Ni贫As,被热液矿物充填或交代。热液成因的细脉浸染状黄铁矿具多阶段演化特征：早期黄铁矿（Py1）呈疏松多孔的海绵状结构,被后期黄铁矿增生,As含量范围明显间断,早期黄铁矿（Py1）是草莓体在热液叠加下重结晶的产物。Py2以Py1为核继续生长,致密均一的晶体内部存在长柱状毒砂、蠕虫状闪锌矿、磁黄铁矿、黄铜矿、黝铜矿和自然金包体,晶间和裂隙中充填黄铜矿、黝铜矿、闪锌矿和自然金。主成矿阶段的黄铁矿与大量毒砂共生呈脉状（Py3a）或浸染状（Py3b）,晶间可见黄铜矿、闪锌矿、磁黄铁矿、车轮矿和自然金。热液黄铁矿的Ni、S含量较低,而As含量较高。随着成矿作用的进行,As逐渐替代黄铁矿中的S。根据矿物共生组合,可将哈图金矿床成岩成矿作用划分为草莓状黄铁矿阶段、石英-钠长石阶段（Ⅰ）、白云母-磷灰石阶段（Ⅱ）、黄铁矿-自然金阶段（Ⅲ）、毒砂-黄铁矿阶段（Ⅳ）和石英-方解石阶段（Ⅴ）,成矿期白云母（Ms2和Ms3）和磷灰石（Ap2）富FeO、MgO、MnO。与草莓状黄铁矿伴生的泥质和石墨,显著改变了成矿流体的氧逸度,诱发金沉淀形成金矿化。 |
| 中文关键词:地质学 草莓状黄铁矿 热液黄铁矿 白云母 哈图金矿 新疆 |
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| Different types of pyrites in Hatu gold deposit, Xinjiang：Origin and ore deposit significance |
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| Abstract:Pyrites in the Hatu gold deposit have two distinct origins, i.e., syn-sendimentary pyrites with framboidal or fine grained texture and hydrothermal pyrite. Framboids, rich in Ni and poor in As, were replaced by hydrothermal minerals. Hydrothermal pyrites display multi-stage features. Porous Py1 with interrupted As concentration should be interpreted as being recrystallized by earlier framboid. However, Py2 forms completely homogeneous grains that commonly overgrow py1, and contains abundant inclusions of arsenopyrite, sphalerite, pyrrhotite, chalcopyrite, tetrahedrite and native gold. Its fractures are filled with chalcopyrite, tetrahedrite and native gold. Pyrites of the ore-forming stage, with abundant arsenopyrites in veinlets (Py3a) or occurring as disseminated distribution (Py3b), are associated with chalcopyrite, sphalerite, pyrrhotite, bournonite and native gold. Sulfur in pyrite was gradually replaced by As during mineralization. According to paragenetic relationship and vein cutting, the diagenetic-hydrothermal process of the Hatu gold deposit can be divided into framboid stage, quartz-albite stage (Ⅰ), muscovite-apatite (Ⅱ), pyrite-gold stage (Ⅲ), arsenopyrite-pyrite stage (Ⅳ) and quartz-calcite stage (Ⅴ). Muscovite (Ms2, Ms3) and apatite (Ap2) of the ore-forming stage have abundant FeO, MgO, and MnO. Mud and graphite associated with framboidal pyrites resulted in remarkable change of oxygen fugacity of hydrothermal fluid, which probably induced gold precipitation. |
| keywords:geology framboidal pyrite hydrothermal pyrite muscovite Hatu gold deposit Xinjiang |
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