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桂西北丹池成矿带He、Ar同位素特征及其地质意义
投稿时间:2020-05-15  修订日期:2020-07-02  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020272
摘要点击次数: 100
全文下载次数: 121
作者单位地址
蔡明海 广西大学资源环境与材料学院 广西南宁市大学路100号广西大学资源与冶金学院
李晔 广西大学资源环境与材料学院 
彭振安 广西大学资源环境与材料学院 
胡志戍 广西大学资源环境与材料学院 
胡鹏飞 广西大学资源环境与材料学院 
肖俊杰 广西大学资源环境与材料学院 
基金项目:广西大厂锡锌铜多金属成矿及找矿研究
中文摘要:丹池成矿带是我国南方重要的有色金属矿业基地。本文对区内芒场矿田马鞍山Pb-Zn矿和大山Sn-Zn矿、大厂矿田铜坑Sn多金属矿、五圩矿田箭猪坡Pb-Zn多金属矿等4个主要矿床矿石黄铁矿流体包裹体He、Ar同位素进行了研究。结果表明,成矿流体的3He/4He=0.79~5.32Ra,介于地壳流体(0.01~0.05Ra)与地幔流体(6~9Ra)特征值之间,40Ar/36Ar=273~351,接近或略高于大气40Ar/36Ar特征值(295. 5),不同矿床成矿流体中均有幔源组分的参与,地幔流体参与成矿作用是一个区域性事件。结合区内泥盆纪喷流沉积作用、花岗质岩体及构造特征等综合研究认为,参与成矿作用的地幔流体主要来自壳-幔相互作用过程中沿NW向深大断裂上升的地幔组分,丹池成矿带成岩、成矿作用是燕山晚期同一构造-热事件产物,矿床成因属后生热液充填-交代成矿。
中文关键词:He-Ar同位素  地幔流体  Sn多金属矿床  丹池成矿带  广西
 
He and Ar Isotope Characteristics and Its Geological Significance in the Danchi Metallogenic Belt, Northwestern Guangxi
Author NameAffiliationAddress
Cai Minghai School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi,530004 广西南宁市大学路100号广西大学资源与冶金学院
Li Ye School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi,530004 
Peng Zhenan School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi,530004 
Hu Zhishu School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi,530004 
Hu Pengfei School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi,530004 
Xiao Junjie School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi,530004 
Abstract:The Danchi metallogenic belt in northwestern Guangxi is an important non-ferrous metal mining base in south China. He, Ar isotopes of fluid inclusion trapped in pyrite from Ma"anshan Pb-Zn deposit and Dashan Sn-Zn deposit of Mangchang ore field, Tongkeng Sn-polymetallic deposit of Dachang ore field and Qianzhupo Pb-Zn polymetallic deposit of Wuxu ore field have been studied in this paper. The results indicate that 3He/4He values (0.79~5.32Ra) of the ore-forming fluid are between those of crustal fluid (0.01~0.05Ra) and mantle fluid (6~9Ra);40Ar/36Ar values (273~349) are close to or slightly higher than the atmospheric eigenvalue (295.S5). He and Ar isotopes show that mantle fluid was involved in the mineralization in the area, and the ore-forming fluid was a mixture of mantle fluid, crust-sourced magmatic fluid and saturated atmospheric water. Based on the comprehensive study of Devonian exhalative deposition, granitic intrusion and tectonic characteristics, it is concluded that mantle fluid involved in mineralization is a regional event in the area. Mantle fluid is mainly derived from mantle components rising along NW deep faults during the crust-mantle interaction. The diagenesis and mineralization of Danchi metallogenic belt are the products of the same tectonic-thermal event in the Late Yanshanian period, and belong to epigenetic hydrothermal filling-metasomatic mineralization.
keywords:He, Ar isotopes  mantle fluid  Sn-polymetallic deposit  northwestern Guangxi
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