河南省鲁山—舞钢地区含石墨岩系岩石地球化学特征及其地质意义  

Rock geochemical characteristics of graphite-hosted strata in Lushan-Wugang area,Henan and its geological significance

作　　者：韩长寿 张燕赞 朱林杰 蒋芹 赵静 许芸 HAN Changshou;ZHANG Yanzan;ZHU Linjie;JIANG Qin;ZHAO Jing;XU Yun(The Fourth Geological Brigade of Henan Province Non-ferrous Metals Geological and Mineral Resources Bureau,Zhengzhou 450016,Henan,China)

机构地区：[1]河南省有色金属地质矿产局第四地质大队,河南郑州450016

出　　处：《矿产与地质》2023年第3期562-570,共9页Mineral Resources and Geology

基　　金：河南省自然资源科研项目(豫自然资函〔2020〕542号-02)资助。

摘　　要：为研究含石墨岩系的岩石地球化学特征,并揭示孔兹岩系变质原岩的物源成分和沉积环境,通过研究含石墨岩系岩石的常量、微量和稀土元素特征,对含石墨岩系的变质原岩、成岩物质来源以及源区环境进行了分析。结果表明:含石墨岩系具低铝的特点,Al_(2)O_(3)、K_(2)O、Na_(2)O的平均质量分数分别为11.91%、2.76%、1.67%;微量元素中大离子亲石元素含量变化相对小,高场强元素含量变化则相对较大;稀土元素呈富轻稀土的分配模式,轻、重稀土有一定分异,(La/Yb)_(N)平均值为11.50,Ce异常不明显,δEu为0.45~1.89。从而认为:区内孔兹岩系为特殊的低铝孔兹岩,岩石地球化学具有陆壳岩石特征。其变质原岩主要为碎屑沉积岩,为一套陆源海相沉积建造,物源是活动构造环境下的首次沉积,其化学风化程度较低。In order to study the geochemical characteristics of graphite-hosted strata and to reveal the composition of material source and sedimentary environment of metamorphic original rock,according to the study of main elements,trace elements and rare earth elements characteristics of rock,the metamorphic origin rocks,its material source and the geological environment of material source area are analyzed.The study result shows that graphite-hosted rock system has the low aluminum characteristics,the average contents of Al_(2)O_(3),K_(2)O and Na_(2)O are 11.91%,2.76%and 1.67%respectively.The content of LILE has the characteristics of small change and the content of HSFE has the characteristics of large change.Rare earth elements show the distribution pattern of enrichment of light rare earth elements,light and heavy rare earth elements have certain differences,the average of(La/Yb)_(N) is 11.50,the Ce anomaly is not obvious andδEu is 0.45-1.89.It is concluded the khondalite series in the area is a special low aluminum khondalite,and the rock geochemistry has the continental crust rock characteristics.The metamorphic origin rock is mainly clastic sedimentary rock which belongs to terrigenouse marine sedimentary formation.The material source is the first sedimentation in the active structure environment,and the degree of chemical weathering is lower.

关 键 词：孔兹岩系 含石墨岩系 太华群 地球化学特征 鲁山—舞钢地区 

分 类 号：P595[天文地球—地球化学] P584[天文地球—地质学]