| 中国剩余重力异常与金属矿分布关系研究 |
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| 引用本文：黄宗理,严加永.2011.中国剩余重力异常与金属矿分布关系研究[J].地球学报,32(6):652-658. |
| DOI：10.3975/cagsb.2011.06.02 |
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| 基金项目:国家科技专项“深部矿产资源立体探测技术与试验”(编号: SinoProbe-03)；国家自然科学基金项目(编号: 41104061) |
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| 中文摘要:剩余重力异常反映地壳浅部岩石密度和厚度的变化, 为成矿背景和找矿预测提供了丰富信息。在分析中国剩余重力异常与金属矿床分布关系的基础上, 划分出兴蒙、华北、中南和新疆天山4个条带状剩余重力异常, 发现金属矿床沿着这些异常条带密集分布。在辽吉黑东部、华东、华南、三江地区的剩余重力异常区里, 金属矿床呈面状均匀分布, 铁铜矿产一般分布在正异常周围, 铅锌矿产主要分布在负异常区。结合大地构造资料, 认为条带状重力异常反映的是不同地块的结合部位, 这些地带地块加厚, 深部成矿物质上侵, 断裂发育, 是形成金属矿带状分布的主要原因。而面状重力异常区则反应了地质活动带, 也有利于金属矿床的形成。根据剩余重力异常和金属矿分布规律, 预测在新疆地区的阿尔泰重力异常带和昆仑山异常带, 腾格里沙漠东缘重力高条带、大兴安岭低重力异常区和川滇藏交界条带重力异常转弯处具有较大的找矿前景。 |
| 中文关键词:剩余重力异常 金属矿分布 成矿规律 深部背景 |
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| The Relationship between the Residual Gravity Anomaly and the Distribution of Metallic Deposits in China |
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| Abstract:Residual gravity anomaly reflects shallow crustal density and thickness of rocks and hence provides rich information for metallogenic research and exploration forecast. Four zoned gravity residual anomalies, i.e., Xin-Meng, North China, Central south and Tianshan Mountains in Xinjiang, were recognized on the basis of the relationship between the residual gravity anomalies and the distribution of metallic deposits in China. The authors found that metallic deposits are densely distributed along these zoned gravity anomalies. Metallic deposits were evenly distributed in planar form in such gravity anomaly areas as eastern Liaoning, Jilin, Heilongjiang, East China, North China and Sanjiang region. In these areas, iron and copper deposits are commonly distributed around positive gravity anomalies, and lead and zinic deposits are commonly distributed in negative gravity anomalies. In combination with tectonic and other information, the authors consider that zoned gravity anomalies reflect the knots of different terranes. In these zones, terranes become thickened, deep metallogenic materials migrate upward, and faults are well developed, causing the zoned distribution of metallic ore deposits. The planar gravity anomaly zone reflects the geologically active zone, where metallic ore deposits are likely to be formed. According to the residual gravity anomalies and distribution of metallic ore deposits, the authors hold that the Altay region in Xinjiang, the Kunlun Mountains, the eastern edge of Tengger Desert, the Da Hinggan Ling low gravity anomaly area, and Sichuan-Yunnan-Tibet border area have favorable exploration prospects. |
| keywords:residual gravity anomaly distribution of metallic ore deposits metallogenic regularity deep background |
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