摘要
华北克拉通南缘卷入印支期的陆陆碰撞和随后的陆内演化中。上述过程的岩浆活动及其伴随的构造活动、地热异常和流体活动,为区域性的金属成矿提供了极为有利的条件。前人对华北南缘小秦岭—熊耳山—外方山一带的金属成矿规律进行了较为详细的总结,而对华北南缘金堆城—潼关一带则较少涉及。据此,本研究通过详细的野外地质考察、岩石学和矿床学研究,结合前人相关理论研究成果,归纳了区域成矿规律,并重新构建了区域成矿模式。初步得出以下结论:1)华北克拉通南缘金堆城—潼关一带金钼矿床成矿类型可以划分为:斑岩型—矽卡岩型、石英脉—碳酸盐脉型、构造蚀变岩型3种。2)收集汇总了华北克拉通南缘近年来国内外学者最新的成岩成矿年龄数据,总结了矿床时空分布规律。3)从岩浆热液、构造、地层等方面总结了区域成矿地质条件和控矿因素,划分了成矿系列,阐明了区域成矿规律;并以初始矿源阶段(新太古代—早元古代)、第一期成矿(晚三叠世约240~200 Ma)和第二期成矿(晚侏罗世—早白垩世约160~110 Ma)3个阶段为基础,构建了华北克拉通南缘金堆城—潼关一带的区域成矿模式。4)在成矿规律研究的基础上提出下一步找矿方向,主要为老牛山岩体北侧一带、华阳川—源头东沟—葫芦沟一带、金堆城南侧百花岭一带、黑山—木龙沟一带4个找矿靶区,尤其是要加大这些区域的深部勘查力度。
The southern margin of the North China Craton was involved in Indosinian continental collision and subsequent intracontinental evolution. The magmatism in the above process-mentioned and their accompanying tectonic activities, geothermal anomalies and fluid activities provided favorable conditions for regional metal mineralization. The metallogenic regularity of Xiaoqinling-Xiongershan-Waifangshan area in the southern margin of the North China has been summarized in detail. However, it is less involved in Jinduicheng-Tongguan area. Accordingly, based on the detailed field geological investigation, petrology and mineralogy research, combined with previous theoretical research results, this study summarized the regional metallogenic law, and reconstructed the regional metallogenic model.The conclusions are as follows Firstly, the metallogenic types in the study area are divided into three types: porphyry type-skarn type, quartz vein type-carbonatite vein type and tectonic altered rock type. Secondly, through collecting and analysis of the newly published isotopic age dating data at home and abroad, the spatial-temporal of ore deposits in the south margin of the North China Craton has been set up. Thirdly, the regional metallogenic geological conditions and ore controlling factors are summarized from the aspects of magmatic hydrothermal fluids,structure and stratum, and the metallogenic series are divided, the regional metallogenic regularity is clarified. The regional metallogenic model of Jinduicheng-Tongguan area in the southern margin of the North China Craton is constructed on the basis of three stages: the initial ore source stage(Neoarchean-Early Proterozoic), the first metallogenic stage(about 240~200 Ma in Late Triassic) and the second metallogenic stage(about 160~110 Ma in Late Jurassic-Early Cretaceous). Fourthly, based on the study of metallogenic regularity, the next prospecting direction is proposed, which mainly includes four prospecting targets, namely, the north side of Laoniushan rock mass, Huayangchuan-Yuantoudonggou-Hulugou area, Baihualing area in the south of Jinduicheng, and Heishan-Mulonggou area. In particular, the deep exploration in these areas should be strengthened.
作者
杨文博
魏丽
徐涛
焦建刚
周海
薛宇泽
俱晓东
Yang Wenbo;Wei Li;Xu Tao;Jiao Jiangang;Zhou Hai;Xue Yuze;Ju Xiaodong(School of Earth Science and Resources,Chang'an University,Xi'an 710054;Shaanxi Planning Research Center of Geological Survey,Xi'an 710068;Shaanxi Institute of Geological Survey,Xi'an 710054;Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi'an 710021)
出处
《地质科学》
CAS
CSCD
北大核心
2022年第2期524-544,共21页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
陕西省地质勘探基金项目(编号:61201506280)
陕西省公益性地质项目(编号:202112)资助。
关键词
华北克拉通南缘
小秦岭
区域成矿规律
区域成矿模式
找矿方向
Southern margin of North China Craton
Xiaoqinling
Regional metallogenic regularity
Regional metallogenic model
Prospecting direction
