Sources of Ore-forming Materials in the Jiaodong Gold Deposits:Constraints on Gold Content from Geological Units Related to Gold Mineralization
Received date: 2024-05-28
Revised date: 2024-07-17
Online published: 2024-09-19
Jiaodong is recognized as the third largest concentration of gold deposits globally.Recent advancements have been achieved in the exploration of gold deposits and the associated metallogenic theories.However,significant gaps remain in the understanding of the genesis of these deposits and the sources of mineralizing materials.A critical question that persists is how to scientifically and coherently elucidate the enrichment of gold (Au) in deposits that exceed the concentrations found in the surrounding rocks.In this study,we systematically collected and analyzed samples of Late Mesozoic granite and Early Cambrian metamorphic rocks from Jiaodong that have not undergone mineralized alteration to determine their gold(Au) content.The average Au content of 97 granite samples was found to be 0.31×10-9.Specifically,the average Au contents for Linglong-type,Guojialing-type,and Weideshan-type granites were 0.25×10-9,0.28×10-9,and 0.35×10-9,respectively.Additionally,the average Au content of 397 samples of Early Precambrian metamorphic rocks was determined to be 1.05×10-9.The abundance of gold in all geological units in Jiaodong is comparable to or lower than that in the Earth’s crust and the average gold content in the North China Plate.However,the gold content in early Precambrian metamorphic rocks is 3.39 times higher than in late Mesozoic granite.Based on previous studies,it is inferred that there is no source area or ore-source rock(layer) with anomalous gold enrichment in Jiaodong.Instead,the substantial gold mineralization is attributed to the partial melting of the ancient metamorphic basement during the Late Mesozoic.During the formation of granitic magma via partial melting of basement metamorphic rocks in the lower crust,over 70% of the gold(Au) precipitates in a comparable “melting” process with in the ultra-high temperature environment,resulting in the production of Au-poor granites.The fluids associated with the magmatic activity of pre-mineralization Linglong and Guojialing-type granites facilitated the migration and enrichment of Au.The substantial alterations in the geochemical com-position of Weideshan and Laoshan-type granites during and subsequent to the mineralization period disrupted the chemical equilibrium of the fluids,thereby creating favorable conditions for the precipitation of gold(Au).
Wenxuan HU , Mingchun SONG , Jie LI , Leilei DONG , Runqian ZHAO , Liangliang ZHANG , Jian LI , Tianhui BAI . Sources of Ore-forming Materials in the Jiaodong Gold Deposits:Constraints on Gold Content from Geological Units Related to Gold Mineralization[J]. Gold Science and Technology, 2024 , 32(5) : 781 -797 . DOI: 10.11872/j.issn.1005-2518.2024.05.148
陕西商洛发现罕见叶碲金矿
据8月29日报道,中国地质调查局西安矿产资源调查中心研究人员与中国地质大学(北京)顾雪祥教授、章永梅副教授以及核工业北京地质研究院范光研究员合作,在陕西省商洛市北秦岭杨斜金矿中发现一种罕见的含金碲矿物——叶碲金矿。
碲是一种典型的稀散元素,属于我国战略性关键矿产资源,被誉为现代工业、国防与尖端技术的“维生素”,广泛用于新能源、信息技术产业,比如薄膜太阳能光伏电池、热成像与热电冷却设备等。
矿物学研究表明,杨斜金矿的叶碲金矿具半自形—他形粒状结构,与黄铁矿、闪锌矿、黝铜矿、碲铅矿和方铅矿等紧密共生,平均化学式为[Pb3.00(Pb1.81Sb1.09)2.90S6.12](Au0.98Te1.95)2.93,属于化学组成稳定且接近理想组成的“正常叶碲金矿”,存在微量的锑替代铅、硫替代碲。综合研究认为,杨斜金矿的叶碲金矿形成于中低温、低硫逸度和相对高碲逸度的富CO2⁃H2O⁃NaCl岩浆热液体系,其成因可能与含金碲矿脉的富贱金属与锑组分的再活化有关。由于大多数含叶碲金矿的金多金属矿床与岩浆热液密切相关,叶碲金矿或可作为指示岩浆流体参与成矿的潜在标型矿物。
此次研究成果对于研究国内发现的矿物和矿床成因具有重要参考价值,为其他热液矿床中识别叶碲金矿提供了有力的地质证据。
本研究得到陕西省自然科学基础研究计划“东秦岭公家坪金矿床Au⁃Ag⁃Te⁃W矿物组合特征及成矿机制研究”和中国地质调查局“东秦岭高岭沟—五里川一带锑金矿产调查评价”项目联合资助,成果发表在国内矿物学权威期刊《矿物学报》上。
中国矿业报)
http://www.goldsci.ac.cn/article/2024/1005-2518/1005-2518-2024-32-5-781.shtml
山东省物化探勘查院王润生、于林松、高晓丰和山东省地质矿产勘查开发局第六地质大队的王斌等共同进行了野外考察和采样,审稿专家对本文的修改提出了宝贵意见和建议,特此致谢!
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