北太行大黄峪黑云母二长花岗岩成因矿物学研究

打开文本图片集

中图分类号：P571 文献标识码：A 文章编号：2097-5465（2025）06-0001-17

Abstract：TheDahuangyuplutonislocatedinthecentralparttheNorthChinaCratonisanimportantcomponent the Mesozoictectonic-magmaticbeltinthe TaihangMountains.Thisstudyconductedresearchonthezircongeochronology， geochemistry，petrogenesistheDahuangyubiotitemonzogranitetodetermineitsemplacementagetectonicsetingto reconstructthemagmaticevolutionprocess．Thestudyfoundthatthezircongrainsinthesampleshavealength-to-widthratio （204 1.31：1 to 2.90：1 ， themaincrystal typesareS P ，indicating a mixed crust-mantle source.The zirconU-Pb age is （204号 130.5Ma ，indicating thatitwasemplacedintheEarly Cretaceous，consistentwiththeformationageotherplutonsinthe northernTaihangMountains.TheTithermometercalculationshowsthatthezirconcrystallzationtemperaturevaryfrom743to 920‰ （average 849 C ）， the zircon Ce oxygen fugacity meter calculation shows that lgf02 vary between-14.80 -5.45 （averageFMQ3.44）．Amphiboleismagnesianamphibole，thethermobarometercalculationshowsthatitsformation temperature is 771 to 789 C ，pressure is 87 to103MPa，oxygen fugacity（ log02 ）is -13.4 to -13，2 ，equilibrium melt water content is 4.4% to 4.6% ， formation depth is3.3 to 3.9 km.Biotite is magnesium-rich biotite，with a formation temperature 693 to 720‰ ，pressure between 43 58 MPa， oxygen fugacity （ log（02 ） -17.21 to -16.28 .The εHf（t） values zirconare distributed between the lower crust upper crust Hf isotopic diferentiation evolution lines（ εHf（εt）=-20.1 4to -17. 77， TDM2=2 304 to2461Ma）.The comprehensive study suggests that the Dahuangyu biotite monzogranite was formed by the interaction crust mantle.

Keywords：zircon；genetic minerology；amphibole；biotite；petrogenesis

0 引言

华北克拉通具有复杂的多阶段的构造演化史，在中生代华北克拉通经历了强烈的构造格局的转变和克拉通的破坏[1]。（剩余19399字）