岩石矿物学杂志2025，Vol.44Issue(4)：924-948,25.DOI:10.20086/j.cnki.yskw.2025.4189
太行山南段洪山沟铜金矿床白云母和绿泥石特征及其找矿意义
Characteristics of muscovite and chlorite in Hongshangou copper-gold deposit and its prospecting significance
摘要
Abstract
The Hongshangou porphyry copper-gold deposit is a typical deposit in the Hongshan polymetallic metal-logenic area.It is located in the Wu'an depression of Shanxi fault uplift in the southern margin of the central North China Craton.The ore body mainly occurs in the Hongshan syenite porphyry.Muscovite and chlorite are well de-veloped in the mineralization center and periphery.In order to discuss the diagenesis and mineralization signifi-cance of muscovite and chlorite in Hongshangou copper-gold deposit,electron probe microanalysis(EPMA)was used to analyze muscovite and chlorite in different occurrences and metallogenic stages of the deposit.The results show that the distribution characteristics of chlorite in the mining area can be divided into three categories:chlorite associated with metal minerals(Chl-1),chlorite altered from hornblende(Chl-2)and chlorite altered from biotite(Chl-3).The three chlorites are all Fe chlorites,indicating that they were formed in a reducing environment.The replacement of Fe to Mg and the replacement of Si to AlⅣ in the structure indicate that the formation of chlorites is affected by Fe-and Mg-rich ore-forming fluids.The formation temperature of chlorite calculated by geological ther-mometer is between 112～272℃,which belongs to the range of medium-low temperature hydrothermal alteration,LA-ICP-MS results show that the completely altered chlorite is richer in Cu,Sn,Rb,Zn,Ti,Li,Sr,V,Co,Ni and Sn.Muscovite mainly includes primary muscovite(Ms-1)and secondary muscovite(Ms-2),which belong to ordinary muscovite and polysilicic muscovite respectively.The muscovite closely related to mineralization has the characteristics of high Si,Fe and low Al,LA-ICP-MS results show that the muscovite formed in the reducing envi-ronment is richer in V and W than the muscovite formed in the oxidizing environment,suggesting the mixing of me-teoric water in the later stage of the fluid.Based on the research results of this paper,the ore-forming fluid of Hongshangou copper-gold deposit is acidic in the early stage and gradually changes to neutral in the later stage.The ore-forming environment of copper-gold deposit is near neutral and reduced medium-low temperature environment.The ore-forming fluid is rich in Fe,Mg and poor in Si.关键词
白云母/绿泥石/电子探针/洪山沟铜金矿床/华北克拉通Key words
muscovite/chlorite/electron probe microanalysis/Hongshangou porphyry copper-gold deposit/North China Craton分类
天文与地球科学引用本文复制引用
王凯迪,张娟,王红,刘新星,张勇,王丽杰,李若丹,关子琼,薛宇..太行山南段洪山沟铜金矿床白云母和绿泥石特征及其找矿意义[J].岩石矿物学杂志,2025,44(4):924-948,25.基金项目
河北省斑岩型矿床研究重点实验室项目(HBBY202408) （HBBY202408）
河北省自然科学基金(D2024403084) （D2024403084）
河北省战略性关键矿产研究协同创新中心开放基金资助(HGUXT-2023-15) （HGUXT-2023-15）
河北地质大学校内预研项目(KY2024QN24) （KY2024QN24）
河北地质大学校内青年项目(QN202217) Key Laboratory of Porphyry Deposit Research in Hebei Province(HBBY202408) （QN202217）
Natural Science Foundation of Hebei Province(D2024403084) （D2024403084）
Hebei Province Strategic Key Minerals Research Collaborative In-novation Center Open Fund(HGUXT-2023-15) （HGUXT-2023-15）
Hebei University of Geosciences Campus Pre-research Project(KY2024QN24) （KY2024QN24）
The Youth Project of Hebei University of Geosciences(QN202217) （QN202217）
