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撰山子金矿床位于内蒙古台隆东段北缘华北克拉通与兴蒙造山带的结合部位。矿体赋存于下二叠统于家北沟组灰岩、中二叠世流纹岩和中三叠世花岗斑岩中,被晚三叠世闪长岩所截切。本文在查明矿床地质特征的基础上,对各成矿阶段热液矿物中的流体包裹体开展研究,查明了矿床成矿流体性质、演化特征及其与金成矿的关系。成矿阶段按从早到晚的顺序可分为石英-黄铁矿、石英-硫化物和石英-萤石-方解石阶段。流体包裹体岩相学和激光拉曼实验表明,热液矿物中原生包裹体可分为气液两相水型包裹体(Ⅰ型)、二氧化碳水三相型包裹体(Ⅱ型)、含子矿物三相型包裹体(Ⅲ型)、纯气相二氧化碳型包裹体(Ⅳ型)、纯气相水型包裹体(Ⅴ型)和纯液相水型包裹体(Ⅵ型)6种类型。成矿流体的温度和盐度从早阶段至晚阶段逐渐降低。成矿流体为中高温、中低和高盐度、中低密度的CO2-NaCl-H2O体系。主成矿阶段气液两相盐水和CO2-H2O三相包裹体限定的成矿压力范围分别为15.7~28.6、59.0~88.7 MPa,整体成矿深度范围在1.6~3.3 km之间。综合分析认为,撰山子金矿床在成矿过程中发生了流体不混溶(沸腾)作用,矿床的形成与中三叠世—晚三叠世华北板块和西伯利亚板块碰撞拼合引起的岩浆活动密切相关,是区内典型的中高温岩浆热液矿床。 相似文献
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内蒙赤峰南部众多金矿床（点）多集中在槽区的地台一侧,而撰山子是赤峰地区产于槽区的唯一成型的金矿床。撰山子金矿赋存规律的研究,不但对该矿生产有指导意义,而且对该区槽区找矿工作也有十分重要意义。在研究金矿赋存规律的基础上,指出了找矿远景区。 相似文献
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撰山子角闪二长花岗岩位于华北克拉通与兴蒙造山带结合部位的中生代构造岩浆活动带,对其开展了主量元素、稀土和微量元素分析以及LA-ICP-MS锆石U-Pb定年等工作,目的在于精确厘定岩体的形成时代和研究其形成的动力学背景。结果表明：花岗岩的LA-ICP-MS锆石U-Pb谐和年龄为（245.8±3.1）Ma（MSWD=3.7,n=17）,属早三叠世。岩石地球化学成分特征显示为,其具有高硅（w（SiO2）=71.68%~72.85%）、富碱（w（Na2O+K2O）=8.98%~9.20%）、高铝（w（Al2O3）=13.45%~13.77%）、低钙（w（CaO）=0.81%~0.99%）及低TFeO/MgO值（平均值为6.55）的特征,属高钾钙碱性、高分异I型弱铝质花岗岩;稀土配分曲线呈现向右倾斜的配分模式,Eu具有明显的亏损（δEu=0.66~0.68）,表明斜长石发生了明显的分离结晶作用;在微量元素原始地幔标准化图谱上呈现清晰的Th、U、La、P富集,Ba、Nb、Ti、Sr、Ta等相对亏损的特征。综合分析认为,撰山子角闪二长花岗岩主要形成于下地壳部分熔融作用,可能有少量的地幔组分加入,其形成于华北板块和西伯利亚板块最终拼合后的后碰撞/后造山伸展作用构造环境。 相似文献
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内蒙古撰山子金矿黄铁矿的热电性特征及其与金成矿作用的关系 总被引：2，自引：0，他引：2
研究了撰山子金矿床中金的主要载体矿物黄铁矿的形成世代、黄铁矿热电性的一般特征及黄铁矿的热电性与晶体形态、化学成分及金成矿作用的关系。结果表明：与岩浆作用有关的金矿床中，黄铁矿的导电类型既有n型、p型，又有n—p中间型，并以p型为主；不同成矿阶段的黄铁矿其热电性特征不同；黄铁矿热电性特征在矿体空间上具有一定的规律。 相似文献
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Zhenjun Sun Zongqi Wang Henan Yu Chengyang Wang Guanghu Liu Xaingdong Bai 《Resource Geology》2019,69(1):1-21
The Zhuanshanzi gold deposit lies in the eastern section of the Xingmeng orogenic belt and the northern section of the Chifeng‐Chaoyang gold belt. The gold veins are strictly controlled by a NW‐oriented shear fault zone. Quartz veins and altered tectonic rock‐type gold veins are the main vein types. The deposits can be divided into four mineralization stages, and the second and third metallogenic stages are the main metallogenic stages. In this paper, based on the detailed field geological surveys, an analysis of the orebody and ore characteristics, microtemperature measurement of fluid inclusions, the Laser Raman spectrum of the inclusions, determination of C? H? O? S? Pb isotopic geochemical characteristics, and so on were carried out to explore the origin of the ore‐forming fluids, ore‐forming materials, and the genesis of the deposits. The results show that the fluid inclusions can be divided into four types: type I – gas–liquid two‐phase inclusions; type II – gas‐rich inclusions; type III– liquid inclusions; and type IV – CO2‐containing three‐phase inclusions. However, they are dominated by type Ib – gas liquid inclusions and type IV – three‐phase inclusions containing CO2. The gas compositions are mainly H2O and CO2, indicating that the metallogenic system is a CO2? H2O? NaCl system. The homogenization temperature of the ore‐forming fluid evolved from a middle temperature to a low temperature, and the temperature of the fluid was further reduced due to meteoric water mixing during the late stage, as well as a lack of CO2 components, and eventually evolved into a simple NaCl? H2O hydrothermal system. C? H? O? S? Pb isotope research proved that the ore‐forming fluids are mainly magmatic water during the early stage, with abundant meteoric water mixed in during the late stage. Ore‐forming materials originated mostly from hypomagma and were possibly influenced by the surrounding rocks, suggesting that the ore‐forming materials were mainly magmatic hydrothermal deposits, with a small amount of crustal component. The fluid immiscibility and the CO2 and CH4 gases in the fluids played an active and important role in the precipitation and enrichment of Au during different metallogenic stages. The deposit is considered a magmatic hydrothermal deposit of middle–low temperature. 相似文献
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金矿在成矿作用与成晕作用中元素行为是有差异的,而矿化强度、矿化类型是影响元素行为差异的主要因素。通过对元素行为差异的成因分析,便于正确选择指示元素,合理确定指标参数以及原生晕信息可信度的确立,以便合理地利用原生晕地球化学信息。 相似文献
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