矿床地质2026，Vol.45Issue(2)：272-292,21.DOI:10.16111/j.0258-7106.2026.02.004
福建紫金山高硫型浅成低温金铜矿床APS矿物特征及指示意义
Mineralogical characteristics and exploration significance of APS minerals in high-sulfidation epithermal Au-Cu deposit of Zijinshan,Fujian
摘要
Abstract
Aluminum-phosphate-sulphate(APS)minerals are key indicators at the porphyry-epithermal transition,yet their application as exploration vectors remains insufficiently studied.At the Zijinshan high-sulfidation epither-mal Au-Cu deposit,APS minerals are widely developed within advanced argillic alteration zones overprinting ear-lier phyllic alteration.They commonly occur as fine-grained,anhedral aggregates,replaced by alunite,and are dis-tributed within alunite+dickite+muscovite mineral assemblages.Electron microprobe analyses indicate that these APS minerals are alunite-supergroup solid solutions(representing the plumbogummite and beudantite series)en-riched in Ca,Sr,Ba,Pb,and LREE.Core-to-rim textures reveal an evolutionary sequence from early LREE-domi-nant florencite,to Pb-rich hinsdalite,followed by Sr-enriched svanbergite,and finally late Ca-dominated wood-houseite.This sequence suggests a progressive decrease in pH and a continuous increase in oxygen fugacity(f(O2))of the ore-forming fluid.Ca-or Sr-rich APS minerals are associated with pyrophyllite assemblages,whereas LREE-rich APS minerals correlate with dickite/kaolinite assemblages,implying that early-stage ore-forming flu-ids were enriched in LREE and Pb,while later stages were enriched in Ca and Sr.Elements such as Al,P,Ca,Sr,K,Na,and LREE were primarily derived from wall-rock feldspar and apatite,S was mainly supplied by magmat-ic vapor,and Pb was introduced by deep-seated porphyry mineralization fluids.Trace element profile analysis demonstrates that the P/S and(Ca+Sr)combination in APS minerals effectively traces the direction of fluid acidi-fication and oxidation,while the Pb and LREE combination indicates proximity to the hydrothermal center and the underlying porphyry body.Spatial variations of trace elements along the profile show that during fluid migra-tion from the southeast(hydrothermal center)towards the northwest,temperature and oxygen fugacity decreased,while pH increased.关键词
APS矿物/矿物特征/地球化学指标/紫金山金铜矿床Key words
APS minerals/mineral characteristics/geochemical indicators/Zijinshan Au-Cu deposit分类
天文与地球科学引用本文复制引用
陈辉,谢桂青,刘文元,毛景文,徐净,朱乔乔,段士刚..福建紫金山高硫型浅成低温金铜矿床APS矿物特征及指示意义[J].矿床地质,2026,45(2):272-292,21.基金项目
本文得到国家重点研究计划项目(编号:2022YFC2903601)和国家自然科学基金青年科学基金项目(A类)(编号:41925011)联合资助 （编号:2022YFC2903601）
