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南岭地区钨矿床共(伴)生金属特征及其地质意义初探

华仁民,张文兰,李光来,胡东泉,王旭东   

  1. 内生金属矿床成矿机制研究国家重点实验室,南京大学 地球科学与工程学院,南京 210093
  • 收稿日期:2008-12-20 修回日期:2008-12-20 出版日期:2008-12-20 发布日期:2008-12-20

A Preliminary Study on the Features and Geologic Implication of the Accompanying Metals in Tungsten Deposits in the Nanling Region

HUA Ren-min, ZHANG Wen-lan, LI Guang-lai, HU Dong-quan, WANG Xu-dong   

  1. State Key Laboratory for Mineral Deposits Research, School of Geological Sciences and Engineering,Nanjing University, Nanjing 210093, China
  • Received:2008-12-20 Revised:2008-12-20 Online:2008-12-20 Published:2008-12-20

摘要: 南岭是世界上最重要的钨矿产地,南岭钨矿床中与钨共(伴)生的有色、稀有及贵金属种类很多,数量可观,也是我国重要的矿产资源。论述了南岭及其邻近地区众多钨矿床中与钨共生或伴生的锡、钼、铋、铌钽、铜、铅锌、金银、稀土等元素的不同状况和特征,其中锡、钼、铋是南岭钨矿床中最普遍最重要的共(伴)生元素,铌钽只在演化程度较高的花岗岩相关的钨矿床中伴生产出,铜、金作为钨矿床伴生金属的意义较小,而钨矿床中伴生的银、铅锌具有相当重要的意义。从元素地球化学性质、南岭的区域地背景、花岗岩演化、多期多阶段成矿作用等方面出发,分析和解释了它们之间相互共(伴)生的原因及差异性,探讨了其地质意义。

Abstract: The Nanling Range area in South China is the most important tungsten producing district in the world. It also yields great amount of other nonferrous, rare, and precious metal resources as the accompaniments with tungsten mineralization. This paper describes the different situations and characteristics of several accompanying metals, e.g. Sn, Mo, Bi, Ta-Nb, Cu, Au, Ag,Pb-Zn and REE, in tungsten deposits in the Nanling Range and vicinity areas. Sn, Mo, and Bi are the most common and important elements among these accompaniments, whereas Ta-Nb is only accompanied with W deposits related to highly evolved granitic rocks. Cu and Au are not important accompanying members of tungsten mineralization in this area, while Ag and Pb-Zn are much more common in the Nanling tungsten deposits. The paper also explains the factors which caused the different behaviors of these elements from the view of geochemical features, regional geological backgrounds, evolution of granitic rocks, as well as the superposition of multi-staged mineralizations. The geological implication of these accompanying relations is also discussed.After then a big window occurred in the Nanling area, triggering the asthenospheric substance got into the upper crust so that developed large-scale high fractionation paraluminous granite and related polymetallic W-Sn mineralization. It was a relatively quiet period of 150~135 Ma in South China except for the Middle-Lower Yangtze River Valley area located in the northeastern margin of the South China plate. Because starting to change motion-direction to northeast the subucted plate was teared up along the Middle-Lower Yangtze River Valley which used to be a foreland basin of the Triassic Dabie-Sulu orogenic belt. A group of skarn-porphyry Cu-Mo-Au-Fe ore system and related I-type or aidakitic granites developed along the cross of the Middle-Lower Yangtze River Valley with the NE-trending faults at an age range of 145~135 Ma. From 135 Ma the subducted plate moved along several groups of regional-scale NE-striking fault zones comprising the Tan-Lu fault zone, which trigged the Eurasian continent to extensive extension. At the setting developed a lot of linear NE-trending Cretaceous faulting basins and metamorphic cores accompanied with volcanic rock eruption as well as epithermal Cu-Au-Ag ore system, granite-related polymetallic Sn (W) deposits and hydrothermal uranium deposits at age of 120~80 Ma with a peak of 100~90 Ma.