华北陆块北缘成矿带金矿床成矿规律及成矿预测

    Metallogenic regularities and prediction of gold deposits in the metallogenic belt of the northern margin of the North China Craton

    • 摘要: 华北陆块北缘成矿带是我国北方重要的稀土、金多金属成矿区带,其成矿地质条件优越,找矿潜力巨大。在金矿产地数据库建设的基础上,系统总结华北陆块北缘成矿带金矿床时空分布规律, 该成矿带金矿床成矿具有明显的东西段时空分异特征,其中海西期—印支期为西段金矿床的主要成矿期,燕山期为东段金矿床的主要成矿期。根据不同类型金矿床的成矿控制因素,梳理出43个地质、化探异常等控矿要素,利用信息量法筛选出23个预测要素,并对成矿带内金矿找矿远景区进行圈定。共圈定金找矿远景区77处,其中Ⅰ级找矿远景区26处、Ⅱ级找矿远景区31处、Ⅲ级找矿远景区20处。综合分析认为,乌拉山、乌拉特中旗—达茂旗、苏尼特右旗—镶黄旗、新地沟、赤峰南部、辽西金厂沟梁—二道沟金成矿有利区集中了成矿带内最核心有利地段的22处Ⅰ级找矿远景区,是华北陆块北缘成矿带未来金矿勘查部署的重点方向。

       

      Abstract: The metallogenic belt of the northern margin of the North China Craton is an important rare earth-gold polymetallic metallogenic zone in Northern China, characterized by favorable metallogenic geological conditions and significant exploration potential. The spatiotemporal distribution rules of gold deposits in the metallogenic belt of the northern margin of the North China Craton were summarized in this research, based on the gold ore deposit database. The results revealed a distinct east-west spatiotemporal differentiation. The Hercynian-Indosinian period was the main mineralization epoch in the western segment, and the Yanshanian period was the primary mineralization epoch in the eastern segment. Based on the analysis of ore-controlling factors for different types of gold deposits, 43 ore-controlling factors including geological and geochemical anomalies were collected and analyzed. Besides, 23 predictive factors were identified using the information computation method, leading to the delineation of gold exploration prospect areas within the metallogenic belt. The results showed that 77 prospective areas were identified and classified into three levels: 26 Level Ⅰ, 31 Level Ⅱ, and 20 Level Ⅲ prospective areas. The favorable metallogenic areas that is Wulashan, Wulatezhongqi-Damaoqi, Suniteyouqi-Xianghuangqi, Xindigou, the southern Chifeng, and Jinchanggouliang-Erdaogou in the western Liaoning were delineated through comprehensive analysis, where hosted 22 most critical Level Ⅰ prospective areas, indicating the key targets for future gold exploration in the metallogenic belt of the northern margin of the North China Craton.

       

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