矿床地质2018，Vol.37Issue(3)：481-501,21.DOI:10.16111/j.0258-7106.2018.03.003
云南南秧田钨矿床电气石的成分和硼同位素特征及成矿意义
Chemical and boron isotopic composition of hydrothermal tourmaline from Nanyangtian tungsten deposit, Yunnan: Implications for ore genesis
摘要
Abstract
The Nanyangtian deposit is the largest W-polymetallic deposit in southeastern Yunnan.Tourmaline-bearing granitic gneiss,quartz vein,and scheelite-bearing tourmaline-quartz vein were emphatically studied in this paper.The genesis of tourmaline was identified by the combination of geological characteristics,geochemistry and B isotope.The result reveals that the tourmalines of three types belong to dravite characterized by high-Mg,no or low Al in Y-site,and relatively high FeO/(FeO + MgO) ratios (0.53 on average).The chondrite-normalized REE patterns are comparable with those of the Late Cretaceous granite.The δ11B values are concentrated on-14‰,approximate to the value of average crust.These features show the post-magmatic hydrothermal fluid after magmatism.Extensive W-mineralization in tourmaline quartzite shows that the hydrothermal fluid after Late Cretaceous magmatism was beneficial to re-enrichment for the major orebody in the ore district.Hence,the authors hold that the beneficial mineralized location should be located at the medium distance (from a hundred meters to 1 km) from the Late Cretaceous granite.This study provides the direction for exploration and evaluation of deep ore district.关键词
地球化学/钨矿床/电气石/B同位素/麻栗坡/滇东南Key words
geochemistry/tungsten deposit/tourmaline/boron isotope/Malipo/southeast Yunnan分类
天文与地球科学引用本文复制引用
张林奎,张彬,张斌辉,李光明,陈敏华,石洪召,曹华文,张寿庭..云南南秧田钨矿床电气石的成分和硼同位素特征及成矿意义[J].矿床地质,2018,37(3):481-501,21.基金项目
本研究得到中国地质调查局地质调查项目(编号:DD20160015,1212010880402)的资助 （编号:DD20160015,1212010880402）
