福建龙岩中甲锡多金属矿地质特征及成矿模式探讨
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摘要
福建龙岩中甲锡多金属矿位于华夏陆块的永安-梅州-惠阳多金属成矿带(Ⅲ级)的南段,是晚侏罗世-早白垩世构造岩浆活动的产物。通过野外地质调查、岩石学、地球化学和综合研究等方法,研究了该矿床的地质及地球化学特征。结果表明:锡矿体主要贮存在花岗斑岩及其接触带,以花岗斑岩为中心,矿化蚀变分为2个带,内带为高温的黄玉云英岩化带,主要为钨锡矿化;外带为中温的绢英岩化带,主要为锡钼矿化。早白垩世花岗斑岩富铁、富挥发分,各类成矿元素含量高,矿化蚀变以花岗斑岩为中心具规律性分带特征,为锡矿的成矿地质体。矿化蚀变自花岗斑岩延至接触带,说明该矿属斑岩型锡矿。探讨了该锡多金属矿与构造岩浆活动的关系,讨论了成矿过程,初步研究其成矿模式。
Longyan Zhongjia tin polymetallic deposit of Fujian province locates in the southern part of the Yong'an-Meizhou-Huiyang metallogenic belt(Ⅲ grade) of Cathaysian continental block. It is the product of tectonic magma activity in late Jurassic-early Cretaceous. According to the works of field geological investigation, petrology, geochemistry and comprehensive study, this paper reveals the geological and geochemical characteristics of the deposit. The results indicate that the ore bodies are mainly distributed in granite porphyries and their internal or external contact zones. Centered on granite porphyry, mineralization and alteration are divided into two zones: the inner zone is high temperature topaz greisen zone, mainly tungsten and tin mineralization; the outer zone is middle temperature sericitization zone, mainly tin and molybdenum mineralization. Ore-forming geological bodies are early Cretaceous granite porphyries, which are rich in iron and volatile materials, with high contents of metallogenic elements, having regular zonation feature of mineralization and alteration centered on them from granite porphyry to contact zones, which indicates it was a typical porphyry type deposit. The relationships between the tin polymetallic deposit and tectonic magmatic activities were investigated, ore-forming processes were discussed and metallogenic model was preliminarily proposed in this paper.
Longyan Zhongjia tin polymetallic deposit of Fujian province locates in the southern part of the Yong'an-Meizhou-Huiyang metallogenic belt(Ⅲ grade) of Cathaysian continental block. It is the product of tectonic magma activity in late Jurassic-early Cretaceous. According to the works of field geological investigation, petrology, geochemistry and comprehensive study, this paper reveals the geological and geochemical characteristics of the deposit. The results indicate that the ore bodies are mainly distributed in granite porphyries and their internal or external contact zones. Centered on granite porphyry, mineralization and alteration are divided into two zones: the inner zone is high temperature topaz greisen zone, mainly tungsten and tin mineralization; the outer zone is middle temperature sericitization zone, mainly tin and molybdenum mineralization. Ore-forming geological bodies are early Cretaceous granite porphyries, which are rich in iron and volatile materials, with high contents of metallogenic elements, having regular zonation feature of mineralization and alteration centered on them from granite porphyry to contact zones, which indicates it was a typical porphyry type deposit. The relationships between the tin polymetallic deposit and tectonic magmatic activities were investigated, ore-forming processes were discussed and metallogenic model was preliminarily proposed in this paper.
引文
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4 毛建仁,陈荣,李寄嵎,等.闽西南地区晚中生代花岗质岩石的同位素年代学、地球化学及其构造演化. 岩石学报,2006,22(6).
5 Sun SS and McDonough WF. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders,A.D.,Norry,M.J. Eds. ,Magmatism in Ocean Basins. London: Geol. Soc. Spec. Publ.,1989.
6 McDonough WF and Sun SS. Composition of the Earth. Chemical Geology,1995,120.
7 李斌,赵葵东,张倩,等.福建紫金山复式岩体的地球化学特征和成因. 岩石学报,2015,031(03).
8 李昌年.火成岩微量元素岩石学.北京:中国地质大学出版社,1992.
9 王登红,陈郑辉,陈毓川,等.我国重要矿产地成岩成矿年代学研究新数据. 地质学报,2010,84(7).
10 吴福元,刘小驰,纪伟强, 等.高分异花岗岩的识别与研究. 中国科学: 地球科学,2017,47(7).
(1)福建省第八地质大队,福建省漳平市雷仔林矿区锡(钨)矿资源储量调查报告,2010。
2 张达,吴淦国,吴建设,等. 闽西南中甲锡多金属矿床的 Re-Os 同位素年龄及其地质意义. 地质力学学报,2003,9(3).
3 杨祖龙,张德全,丰成友,等. 福建龙岩中甲锡多金属矿床石英斑岩中锆石SHRIMP U-Pb年龄及其地质意义. 矿床地质,2008,27(3).
4 毛建仁,陈荣,李寄嵎,等.闽西南地区晚中生代花岗质岩石的同位素年代学、地球化学及其构造演化. 岩石学报,2006,22(6).
5 Sun SS and McDonough WF. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders,A.D.,Norry,M.J. Eds. ,Magmatism in Ocean Basins. London: Geol. Soc. Spec. Publ.,1989.
6 McDonough WF and Sun SS. Composition of the Earth. Chemical Geology,1995,120.
7 李斌,赵葵东,张倩,等.福建紫金山复式岩体的地球化学特征和成因. 岩石学报,2015,031(03).
8 李昌年.火成岩微量元素岩石学.北京:中国地质大学出版社,1992.
9 王登红,陈郑辉,陈毓川,等.我国重要矿产地成岩成矿年代学研究新数据. 地质学报,2010,84(7).
10 吴福元,刘小驰,纪伟强, 等.高分异花岗岩的识别与研究. 中国科学: 地球科学,2017,47(7).
(1)福建省第八地质大队,福建省漳平市雷仔林矿区锡(钨)矿资源储量调查报告,2010。