矿床地质2024，Vol.43Issue(4)：821-846,26.DOI:10.16111/j.0258-7106.2024.04.006
内蒙古敖汉地区中生代花岗质岩浆活动与金钼多金属成矿作用
Mesozoic granitic magmatism and gold-molybdenum polymetallic mineraliza-tion in Aohan area,Inner Mongolia
摘要
Abstract
The Aohan area in Inner Mongolia is located in the transition zone between the North China Craton and the Xing'an-Mongolia Orogenic Belt,serving as an important gold-molybdenum polymetallic mineralization concen-tration area on the northern margin of the North China Craton,with fruitful prospecting outcomes in recent years.Based on the systematic analysis of the geological and geochemical characteristics of the Zhuanshanzi and Jin-changgouliang large gold deposits,the Baituyingzi large tungsten-molybdenum polymetallic deposit,as well as the newly discovered Bajia large lead-sliver-zinc deposit and the Tengkeli molybdenum deposit,this research dis-cusses the genesis of the deposits and the regional tectono-magmatic evolution,proposing the metallogenic poten-tial and direction for gold-molybdenum polymetallic mineral exploration in the area. The findings indicate that the gold-molybdenum polymetallic mineralization in the Aohan area is closely related to the Indosinian and Yan-shanian granitic magmatism,with mineralization mainly occurring during the Triassic and the Late Jurassic-Early Cretaceous periods. The Indosinian and Yanshanian fertilized intrusions generally belong to the peraluminous to weakly peraluminous high-K calc-alkaline series of granites,exhibiting right-leaning distribution characteristics enriched in light rare earth elements,enrichment of large ion lithophile elements,and depletion of high fiield strength elements,formed under an extensional setting influenced by the Paleo-Asian and Pacific tectonic do-mains,respectively. The genetic type of gold deposit is mainly magmatic-hydrothermal vein type,and the genetic type of molybdenum deposit is mainly porphyry-type,controlled by tectono-magmatic activities,with the Indosin-ian and Yanshanian felsic magmatic rocks and NW-to nearly NS-trending faults serving as important prospecting indicators. The Zhuanshanzi gold deposit has a prospecting potential for porphyry-and skarn-type gold-copper deposits,while the Jinchanggouliang and Zhuanshanzi gold mining areas and their peripheries have potential for epithermal gold polymetallic deposits. Drawing on the prospecting experience from the Baituyingzi tungsten-mo-lybdenum polymetallic deposit and the Bajia lead-sliver-zinc deposit,it is suggested to focus on the comprehen-sive use of geological,geochemical,and geophysical methods to search for tungsten,molybdenum,lead,zinc,and silver polymetallic deposits in covered areas.关键词
金钼多金属成矿/斑岩型矿床/岩浆热液矿床/构造岩浆演化/内蒙古敖汉Key words
gold-molybdenum polymetallic mineralization/porphyry-type deposit/magmatic-hydrothermal deposit/tectono-magmatic evolution/Aohan/Inner Mongolia分类
天文与地球科学引用本文复制引用
章永梅,顾雪祥,王新利,程慕利,姚诗悦,李来龙,柳江鹏..内蒙古敖汉地区中生代花岗质岩浆活动与金钼多金属成矿作用[J].矿床地质,2024,43(4):821-846,26.基金项目
本文得到新疆维吾尔自治区重点研发计划项目《昆仑造山带金锑、锰、铜、镍钴战略性矿产成矿规律、勘查关键技术与资源潜力评价》(编号:2023B03016)、国家自然科学基金重点项目《新疆西天山北缘晚古生代斑岩-矽卡岩型铜钼铁多金属成矿与岩浆-热液作用过程》(编号:42130804)和新疆维吾尔自治区"天池英才"计划联合资助 （编号:2023B03016）
