岩矿测试2016，Vol.35Issue(6)：658-666,9.DOI:10.15898/j.cnki.11-2131/td.2016.06.013
激光剥蚀电感耦合等离子体质谱－电子探针分析白山堂铜矿中的黄铁矿成分
Determination of Composition of Pyrite in the Baishantang Copper Deposit by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry and Electron Microprobe
摘要
Abstract
Determination of trace elements in analyzed mineral phase by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS )is a new in situ technique for mineral phase analyses. As an important mineral in porphyry copper deposits, the major and trace elements of pyrite can provide important information for the ore-forming process.A method for determination of the trace elements in pyrite by LA-ICP-MS and major elements by Electron Microprobe was developed and has been applied to the Baishantang porphyry copper ore district.For the LA-ICP-MS experiment,the laser beam is 60 μm,the carrier gas is helium,the repetition frequency is 5 Hz, the laser energy is 6 J/cm2 ,and the analysis time of single point is 60 s.Iron was used as an internal standard and MASS -1 was used to calibrate the data.Analysis precision of most elements is better than 1 0%.For the similar optical properties of pyrite and arsenopyrite, the differences of physical properties can be used to distinguish them. Pyrite in the Baishantang porphyry copper deposit is depleted in sulfur but rich in iron,indicating a hydrothermal origin.The trace element composition of pyrite indicates that pyrite was formed at a medium depth and belongs to the medium-low temperature hydrothermal type related to volcanism.This conclusion has provided important evidence for the ore genesis and the source of ore-forming fluids of the Baishantang porphyry copper deposit,which can also guide the next-step exploration.关键词
黄铁矿/白山堂铜矿/激光剥蚀电感耦合等离子体质谱/电子探针/主量和微量元素Key words
pyrite/Baishantang copper deposit/Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry/Electron Microprobe/major and trace elements分类
天文与地球科学引用本文复制引用
闫巧娟,魏小燕,叶美芳,赵慧博,周宁超..激光剥蚀电感耦合等离子体质谱－电子探针分析白山堂铜矿中的黄铁矿成分[J].岩矿测试,2016,35(6):658-666,9.基金项目
中国地质调查局地质调查工作项目“北山地区斑岩型铜矿特征矿物测试技术研究” （）
