| 大兴安岭南段锡的成矿作用：以黄岗-甘珠尔庙地区为例 |
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| 引用本文： | 徐,巧.大兴安岭南段锡的成矿作用：以黄岗-甘珠尔庙地区为例[J].地质与勘探,2023,59(2):271-284. |
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| 作者姓名： | 徐 巧 |
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| 作者单位： | 北京矿产地质研究院有限责任公司，北京； 赤峰中色白音诺尔矿业有限公司，内蒙古赤峰；中国有色金属工业昆明勘察设计研究院有限公司，云南昆明； 北京绿勘科技有限责任公司，北京 |
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| 基金项目： | 国家重点研发计划“深地资源勘查开采”重点专项（编号:2017YFC0601305）、青年科学基金项目（编号：41602098）和中国地质调查局国家二级项目大兴安岭中南段有色金属基地综合地质调查（编号：DD20190815）联合资助 |
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| 摘 要： | 大兴安岭南段是我国重要的锡多金属成矿集中区，为促进区域锡多金属找矿突破，以在黄岗-甘珠尔庙地区多年的野外调查研究工作为基础，运用年代学测试、化学分析及地质模型等方法，分析了区域锡的成矿作用。认为二叠统基底地层及锡林郭勒杂岩是成矿物质的初始来源，经历的变质过程具有进一步富集的作用，大部分锡矿均遭受了多期次的火山-岩浆活动，最终决定锡多金属成矿的是燕山期酸性岩浆-热液成矿作用。同时成矿作用还受到控岩控矿构造、围岩性质、氧化-还原条件、开放-封闭环境的制约，认为在氧化性花岗岩浆侵入钙质地层条件下成矿作用以铁锡为主；还原性岩浆在侵入具开放性特征的围岩时，成矿作用以花岗岩外带围岩中的热液型脉状锡矿为主，而在侵入具封闭性特征的围岩时，成矿作用以花岗岩内带岩浆凸起部位的花岗岩型锡矿为主。因此，建议将主攻矿种由铅锌调整为锡银，部署重砂及化探方法圈定异常，针对硫化矿体部署电法，针对隐伏岩体部署磁法与重力，还可部署烃、汞、氧气测量等非常规化探方法预测隐伏岩体。
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| 关 键 词： | 大兴安岭南段 黄岗-甘珠尔庙 锡多金属 成矿作用 氧化-还原 开放-封闭 |
| 收稿时间： | 2020/6/27 0:00:00 |
| 修稿时间： | 2020/12/5 0:00:00 |
The mineralization of tin in the southern section of the Daxing'an Mountains: A case study of the Huanggang-Ganzhuermiao area |
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| Xu Qiao.The mineralization of tin in the southern section of the Daxing'an Mountains: A case study of the Huanggang-Ganzhuermiao area[J].Geology and Prospecting,2023,59(2):271-284. |
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| Authors: | Xu Qiao |
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| Abstract: | The southern section of the Daxing''an Mountains is an important tin polymetallic concentration area in China. In order to promote the breakthrough of tin polymetallic prospecting in the region, this work analyzed the tin mineralization in the region by chronology tests, chemical analysis and geological model, based on field investigations in the Huanggang-Ganzhuermiao area for many years. It is believed that the Permian basement strata and Xilinguole complex were the initial source of ore-forming materials, and the metamorphism process further added to the enrichment. Most of the tin deposits have undergone multiple stages of volcanic-magmatic activities. And the acidic magmatic-hydrothermal mineralization of Yanshanian polymetallic tin plays a decisive role in the tin polymetallic mineralization. At the same time, the mineralization was also constrained by the rock-control and ore-control structures, the properties of surrounding rocks, the oxidation-reduction conditions, and the open-closed environment. It is considered that iron and tin mineralization is dominant when oxidizing granitic magma intruded into calcareous strata. When the reductive magma intruded into the open rock, the mineralization was dominated by hydrothermal vein tin deposits in the surrounding rock of the outer zone of granite. When the reductive magma intrudes into the surrounding rock of the closed zone, the mineralization was dominated by granite-type tin deposits in the magmatic uplift of the inner zone of granite. Therefore, it is suggested to adjust the main mining target from lead-zinc to tin-silver, deploy heavy sand and geochemical methods to delineate anomalies, deploy electrical methods for sulfide ore bodies, deploy magnetic and gravity methods for concealed rock bodies, and also deploy unconventional exploration methods such as hydrocarbon, mercury, and oxygen measurement to predict concealed rock bodies. |
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| Keywords: | southern section of Daxing''an Mountains Huanggang-Ganzhuermiao tin polymetallic mineralization oxidation-reduction open-closed |
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