中国剩余重力异常与金属矿分布关系研究

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...

The Relationship between the Residual Gravity Anomaly and the Distribution of Metallic Deposits in China

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.