| 刘凯,王瑞廷,丁坤,杨猛,胡波,赵亮,朱满怀,李剑斌,刘志明,郭旭飞,郭琪.秦岭造山带柞水—山阳矿集区龙头沟金矿床成矿时代及其地质意义[J].矿产勘查,2025,16(7):1610-1620 |
| 秦岭造山带柞水—山阳矿集区龙头沟金矿床成矿时代及其地质意义 |
| Metallogenic age of Longtougou gold deposit and its geological significance in the Zhashui-Shanyang ore concentration, Qinling Orogen |
| 投稿时间：2024-07-19 |
| DOI：10.20008/j.kckc.202507005 |
| 中文关键词: 成矿时代 Sm-Nd同位素 伸展构造 龙头沟金矿床 柞水—山阳矿集区 |
| 英文关键词: metallogenic age Sm-Nd isotope stretching structure Longtougou gold deposit Zhashui-Shanyang ore concentration area |
| 基金项目:本文受国家重点研发计划“中东部地区金和铜矿床三维探测技术与增储示范——陕西省夏家店地区金矿综合找矿技术与增储示范”(2022YFC2903605)、中国地质调查局项目“陕西省山阳矿集区深部找矿预测”(DD2019057009)、陕西省自然科学基础研究计划项目(2022JM-169)联合资助。 |
|
| 摘要点击次数: 339 |
| 全文下载次数: 251 |
| 中文摘要: |
| 龙头沟金矿床是柞水—山阳矿集区一热液型金矿床，矿体呈脉状赋存于近东西向断裂构造带中，围岩蚀变强烈，与成矿关系最密切的是硅化、白云石化、重晶石化、黄铁矿化，矿石具中粗粒自形—半自形—他形粒状、交代残余、包含、碎斑和交代环边等结构，块状、角砾状、脉状和稀疏浸染状等构造。矿石矿物主要为黄铁矿、黄铜矿和黝铜矿，脉石矿物有石英、铁碳酸盐、重晶石等，贵金属矿物为自然金。为了精确厘定金矿成矿时代，本文选取龙头沟金矿床主成矿期的白云石、重晶石、石英、黄铁矿等矿物进行了 Sm-Nd同位素定年工作，获得等时线年龄为(141.70±0.92)Ma，与柞水—山阳矿集区 140 Ma左右的构造-岩浆活动时代相当。结合以往研究成果，进一步说明柞水—山阳矿集区存在晚侏罗世—早白垩世金矿成矿事件，认为龙头沟金矿床成矿作用是在秦岭造山带晚侏罗世—早白垩世伸展构造背景下构造-岩浆-热液活动演化的产物，可为矿集区下一步开展矿产勘查及研究提供重要依据。 |
| 英文摘要: |
| The Longtougou gold deposit is a hydrothermal deposit located in the Zhashui-Shanyang ore concen-tration area. The ore bodies occur as veins within a nearly east-west trending fault zone, where wall rocks are in-tensely weathered. Mineralization is most closely associated with silicification, dolomitization, baritization, and pyri-tization. The ore minerals are medium-to coarse-grained and exhibit textures such as subhedral granular, metaso-matic relict, and atoll-like. Ore structures include massive, brecciated, veined, and sparsely disseminated types.The primary ore types are pyrite-quartz-dolomite and pyrite-quartz-barite. The main metallic minerals are pyriteand chalcopyrite, with minor bismuthinite. Gangue minerals are predominantly quartz, ferroan dolomite, and barite.Native gold is the only precious metal mineral. In this study, Sm-Nd isotopic dating of dolomite, barite, quartz, andpyrite from the main mineralization stage yielded an isochron age of (141.70±0.92) Ma. This age is consistent withthat of regional tectonic-magmatic activity (ca. 140 Ma). Combined with previous studies, our results further confirma Late Jurassic-Early Cretaceous gold mineralization event in the Zhashui-Shanyang district. We propose that theLongtougou deposit formed from tectonic-magmatic hydrothermal fluids evolving under an extensional tectonic set-ting in the Qinling Orogenic Belt during this period. This study provides important constraints for future mineral ex-ploration and research in the mining area. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|