| 内蒙古自治区大型金矿地球化学标志与预测 |
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| 引用本文：周建,徐善法,聂兰仕,刘东盛,韩志轩,柳青青,张必敏,刘汉粮,迟清华.2020.内蒙古自治区大型金矿地球化学标志与预测[J].地球学报,41(6):818-826. |
| DOI：10.3975/cagsb.2020.071902 |
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| 基金项目:中国地质调查局地质大调查项目“中亚地区战略资源地球化学调查”(编号: DD20190451);全球地球化学填图计划(编号: 121201108000150005);中国地质科学院基本科研业务费项目(编号: AS2012J01; JYYWF20182401) |
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| 中文摘要:利用1:20万区域化探扫面数据和中蒙边界1:100万地球化学填图数据编制了内蒙古自治区1:100万金地球化学图, 发现内蒙古已知大型金矿与地球化学异常具有良好的对应关系。以内蒙古四个典型大型金矿为例, 建立了1:100万尺度大型金矿地球化学预测指标: (1)异常具有3层套合结构, 即局部异常被区域异常所包裹, 区域异常被地球化学省所包裹; (2)异常面积通常大于1 000 km2; (3)地球化学块体的异常衬度大于2.2; (4)常伴生有Ag、As、Sb、Bi等元素的异常; (5)异常区或周边常具有区域性深大断裂及其次级断裂等构造; (6)异常区或周边一般发育有火成岩。根据建立的大型金矿预测指标, 圈定了大型金矿集区14个, 为下一步在内蒙古选择重点地区开展大型金矿勘查提供了远景区。 |
| 中文关键词:内蒙古 地球化学预测 金矿集区 |
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| The Geochemical Indicator and Prognosis of Large Gold Ore Districts in Inner Mongolia |
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| Abstract:The 1:1 000 000 gold geochemical map in Inner Mongolia was compiled, based on the datasets of 1:200 000 Regional Geochemistry-National Reconnaissance Program (RGNR) and 1:1 000 000 China–Mongolia Geochemical Mapping Project which was carried out across the boundary regions. The large gold ore deposits have a good relationship with gold geochemical anomalies. Geochemical indicators based on the four large gold ore deposits in Inner Mongolia show the following features: (1) 3-level nested geochemical anomalies occur around the large deposits, i.e., a geochemical province containing regional anomalies and local concentration centers; (2) The gold anomaly area is usually larger than 1000 km2; (3) The gold anomaly contrast is higher than 2.2; (4) There are Ag, As, Sb, Bi, Hg geochemical anomalies in general; (5) There are regional deep faults and secondary faults in the gold anomaly area or its periphery; (6) There are generally igneous rocks in the gold anomaly area or its periphery. Finally, 14 large-size gold metallogenic prospective areas were delineated based on the geochemical indicators, regional geology and tectonic setting. |
| keywords:Inner Mongolia geochemical prognosis gold ore districts |
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