The element zonation characteristics of No. XV ore body in Zhaxikang lead-zinc polymetallic deposit, Tibet
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摘要: 作为特提斯喜马拉雅新生代构造–成矿事件中最为典型的Pb-Zn矿化代表的扎西康铅锌多金属矿床,近年来新发现的XV号矿体,规模仅次于主矿体Ⅴ、Ⅵ号矿体,由于其发现时间晚,所以研究程度低。为了更好剖析该矿体地质特征,通过研究XV号矿体的元素分带特征,结果表明:① 矿体围岩地层对Pb、Ag、Sb元素有着良好的供给能力,但Zn的富集成矿与地层关系不大,铅锌矿化与一套完整的高温—中温—低温元素组合Hg、Ag、Sb、Bi、Pb、Sn、Cd、Cu、Mn及Zn密切相关。② XV号矿体主要由含矿热液携带成矿元素往上运移的过程中不断析出成矿,未见明显的叠加改造痕迹。③ 矿体深部仍然具有一定的成矿潜力。XV号矿体分带模型的建立,是对特提斯喜马拉雅新生代构造–成矿事件的良好响应,能较好代表在该事件下Pb-Zn矿化的普遍特征,同时在深部潜力预测等方面也具有重要的意义。Abstract: Represented as the most typical sample of lead-zinc mineralization in the Cenozoic tectonic-metallogenesis of Tethys Himalaya, the Zhaxikang lead-zinc polymetallic deposit's newly discovered No. XV ore body has a third largest scale after the main No. Ⅴ and No. Ⅵ ore bodies. Due to its late discovery time and low research degree, the element zonation research had been conducted to make contributes to geological characteristics of this orebody. The conclusions demonstrate:① The strata around ore body had a good supply capacity of Pb, Ag and Sb elements, while the enrichment of Zn elements had little to do with the strata. The lead-zinc mineralization was closely related to a complete set of high-medium-low temperature association of elements such as Hg, Ag, Sb, Bi, Pb, Sn, Cd, Cu, Mn, and Zn. ② During the migration upward, ore bearing hydrothermal solution was continuously precipitating and mineralizing without obvious overprinted metallogenic process. ③ There was still certain metallogenic potential at depth. The establishment of the zonation model of No. XV ore body would be a proper response to the Cenozoic tectonic-metallogenesis of Tethys Himalaya under which there was a good representation of the general Pb-Zn mineralization. At the meantime, it was also an important significance deep potential prediction.
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Key words:
- element zonation /
- clustering analysis /
- factor analysis /
- Zhaxikang /
- Tibet.
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