华北克拉通中部义兴寨金矿孙庄岩体的成因成矿作用：来自黑云母成分的约束

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中图分类号：P571 文献标识码：A 文章编号：2097-5465（2026）01-0001-11

Abstract：ToelucidatetherelationshipbetweenmagmaticevolutionandmineralizationintheYixingzhaigolddeposit，western NorthChinaCraton，thisstudyfocusesonbiotitefromvariouslithologiesof theSunzhuang intrusionandconductsadetailedgenetic mineralogicalinvestigation.Petrographicobservationsandelectronmicroprobeanalyseswereemployedtosystematicalldetemine the majorandhalogencompositionsofbiotite，aswellastoestimateitsrystallzation temperature，xygenfugacity，andmagma source characteristics.Theresults show that biotitefrom the Sunzhuang intrusion is characterized by high Mg and K but low Ti and Na contents，with Mg0 concentrations ranging from 13.4% to 17.8% ，indicative of acrust-mantle mixed-source signature. Calculated crystallization temperatures range from 69O to 771 C ，with logf02 valuesbetween-17.1 and -14.9 .Inaddition，the biotite is enriched inF，Cl and H2O .These geochemical characteristics suggest that the Sunzhuang intrusion was derived from a high-temperature，high-oxygen-fugacity，volatile-andhalogen-richmagmaformedbycrust-mantleinteraction.Suchmagmatic conditions favoredthemobilizationandenrichmentofoxyphile metalssuchasCuandAu，providingboththematerialsourceand thermal-fluiddriving forcefortheformationofporphyry-typeCu-Audeposits.Consequently，themagmatismoftheSunzuang intrusion isclosely related to themetallogenesis of the Yixingzhai gold deposit.

Keywords：Yixingzhai gold deposit；Sunzhuang intrusion；biotite；genetic mineralogy；metallogenesis

0 引言

义兴寨金矿位于华北克拉通中部，区域内地质构造复杂，岩浆活动频繁，多期次、多类型岩浆岩广泛出露，是近年来金矿成矿研究的重点区域之一。（剩余14943字）