| 郑文宝.西藏扎西康矿区典型剖面岩石地球化学特征及地质意义[J].地质与勘探,2017,53(1):97-108 |
| 西藏扎西康矿区典型剖面岩石地球化学特征及地质意义 |
| Whole-rock geochemical characteristics of a typical cross-section in the Zhaxikang ore district of Tibet and their geological significance |
| 投稿时间：2015-07-25 修订日期：2016-05-22 |
| DOI：10.12134/j.dzykt.2017.01.010 |
| 中文关键词: 岩石地球化学 流体来源 矿床成因 扎西康Sb-Pb-Zn-Ag矿床 |
| 英文关键词: petrogeochemistry, fluid source, deposit genesis, Zhaxikang Sb-Pb-Zn-Ag deposit, Tibet |
| 基金项目:国家重点基础研究发展计划“973计划”（2011CB403103）和中国地质调查局地质调查项目（12120113093700）资助 |
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| 中文摘要: |
| 扎西康矿床位于北喜马拉雅成矿带内，是目前该带发现的唯一一例大型规模的Sb-Pb-Zn-Ag矿床，该矿床也成为了国内学者研究的热点。但迄今为止，矿床研究工作中非常重要的问题——矿床成因问题，尚未得到解决，目前存在的矿床成因观点达四种之多。本文基于成矿流体来源在解决矿床成因问题研究中的重要地位，通过对扎西康矿床15号地质剖面开展岩石地球化学立典研究，并结合矿体中主成矿元素的分带特征，发现SiO2，Al2O3，CaO，TiO2，Ba，Sr，Co，Ni，∑REE等主要分布在炭质板岩（围岩）中，而Fe2O3，FeO，MnO，Cu，Sn，δEu主要分布在Sb-Pb-Zn-Ag矿体中，提出扎西康Sb-Pb-Zn-Ag矿体由深部至浅部，成矿元素的分带为Sn→Cu→Zn→Pb+Ag→Sb，具有较明显的由高温向低温的演化规律，重塑了扎西康矿床成矿流体沿着断层破碎带向上运移的演化路径。通过对扎西康矿床成矿流体的演化规律研究，文章认为该矿床成矿流体主要来源于岩浆热液，在演化过程中有大气降水的参与，并受到了炭质板岩的改造。根据本文对扎西康矿床成因的认识，得出了扎西康矿床与广西大厂锡矿以及湖南香花岭锡多金属矿较为相似的认识，建议矿区下一步找矿重点为深部的锡矿体。 |
| 英文摘要: |
| The Zhaxikang deposit is the only large-scale Sb-Pb-Zn-Ag deposit located in the north Himalayan metallogeny belt, which has been a research focus spot for numerous researchers. However, a very important issue of the deposit genesis has not been solved, and four viewpoints about the genesis have been put forward. For the important role of fluid source in researching deposit genesis, this work conducted representative petrogeochemical study of the geological profile No. 15 in this deposit. Integrated with the zonation features of the main ore-forming elements, it is suggested that SiO2, Al2O3, CaO, TiO2, Ba, Sr, Co, Ni and ∑REE are mainly rich in the carbonaceous slate (wall-rock); while Fe2O3, FeO, MnO, Cu, Sn and δEu are rich in the Sb-Pb-Zn-Ag orebodies. It is proposed that the element zonation of the Zhaxikang deposit is Sn→Cu→Zn→Pb+Ag→Sb from deep to shallow, showing the fluid evolution from high temperature to low temperature, which remodels the evolutional way of ore fluids transporting upward along fault zone. Through studying fluid evolution, we consider that the ore fluids of this deposit mainly derived from magmatic-hydrothermal fluids and were remobilized by meteoric water and carbonaceous slate in the process of evolution. It is thus concluded that the Zhaxikang deposit is similar to the Dachang tin deposit in Guangxi and Xianghualing tin-polymetallic deposit in Hunan, and that the next prospecting goal is tin orebodies in the deep. |
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