Geological characteristics, diagenesis and mineralization of key gold concentration areas in Liaoning Province
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摘要: 作为我国重要的产金省份,辽宁省的中生代构造、岩浆活动较为强烈,并伴有强烈的金成矿作用。根据金矿床的空间分布特征,将辽宁省划分出5个重点金矿集区,为深入了解各金矿集区内金矿床的成岩成矿作用,对金矿集区的地质特征、成岩成矿时代、地球化学等方面进行了系统分析。研究表明: 各金矿集区的金成矿作用与印支期、燕山期岩浆活动有关,成矿时间集中于126~118 Ma、225~188 Ma; 辽西金矿集区金矿石中的S属于地幔硫,而辽东金矿集区S来源于岩浆和变质岩地层,各矿集区矿石的Pb具有壳幔混合源特征,5个重点金矿集区的成矿物质源区组成为同一岩浆源区、不同岩浆演化阶段的产物,成岩成矿物质为下地壳部分熔融的产物,并有部分幔源物质参与。结合近年找矿进展,建立了辽宁省金矿找矿预测地质模型,可为下一步开展区域矿产勘查工作提供新思路。Abstract: As the important gold producing province in China, Liaoning Province has strong Mesozoic tectonic and magmatic activities, with great gold mineralization. Liaoning Province is divided into five key gold concentration areas, according to the spatial distribution characteristics of gold deposits. In order to deeply understand the diagenesis and mineralization of gold deposits in each gold concentration area, the authors systematically analyzed the geological characteristics, diagenesis and mineralization age, and the geochemistry of the gold concentration area. The results show that the gold mineralization in each gold concentration area is related to the magmatic activities of Indosinian and Yanshanian periods, and the metallogenic time is concentrated in 126~118 Ma and 225~188 Ma. The sulfur in gold ores in Western Liaoning gold concentration area belongs to mantle sulfur, while the sulfur in Eastern Liaoning gold concentration area comes from magmatic and metamorphic rock strata. The Pb in ore source of each ore concentration area has the characteristics of crust mantle mixed source. The source areas of the five key gold concentration areas are composed of the products of different magmatic evolution stages in the same magmatic source area. The ore material sources of five important gold concentration areas are magmatic evolution products from one magmatic source under different stages, and the diagenetic and diagenetic minerals are the products of partial melting of the lower crust, with the participation of some mantle derived materials. The geological model for gold prospecting prediction in Liaoning Province was established, combined with the recent prospecting progress, which could provide a new idea for further regional mineral exploration.
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