阿尔泰造山带依列克塔斯岩组片麻岩地球化学特征及形成环境  

Geochemical Characteristics and Formation Environment of Yiliketasi Rock Group Gneiss in Altay Orogenic Belt

作　　者：韩琼 赵同阳 郑加行 孙耀锋 李平 唐智 Han Qiong;Zhao Tongyang;Zheng Jiaxing;Sun Yaofeng;Li Ping;Tang Zhi(Xinjiang Institute of Geological Survey,Urumqi,Xinjiang,830000,China)

机构地区：[1]新疆维吾尔自治区地质调查院

出　　处：《新疆地质》2019年第4期440-448,共9页Xinjiang Geology

基　　金：新疆区域地质调查片区总结与服务产品开发（DD20160345-04）;新疆阿尔泰1∶5万M45E021013等四幅区域地质矿产调查（12120114040701）;国家重点研发计划专题天山-阿尔泰增生造山带深部矿产矿产潜力评价及系列编图（2018YFC0604001-04）共同资助

摘　　要：阿尔泰造山带依列克塔斯岩组为一套深变质片麻岩为主的岩石建造,岩石变质变形强烈,构造复杂。该岩组为副变质岩,原岩为沉积岩,岩性为富铝质长英质粘土、泥质砂岩、泥质粉砂岩、泥岩和页岩等,局部夹杂有中基性岩火山岩或同质凝灰质碎屑岩。主量元素表明其原岩为沉积化学成分,具高硅、过铝质钙碱性系列特征。微量元素含量显示Ta,Nb,Sr,P和Ti明显亏损,大离子亲石元素Rb,Ba,K富集,U,La,Ce,Nd,Zr,Hf元素相对富集。稀土元素为轻稀土富集,重稀土亏损,具“V”型分布特点。原岩可能为活动大陆边缘的大陆岛弧环境下的杂砂岩经搬运沉积成岩,后经多期变质作用。The Yilieketasi rock group of Altay orogenic belt of is a set of deep metamorphic gneiss-based rock structures with strong metamorphic deformation and complex tectonic effects.It is a negative gneiss whose primary rocks are sedimentary rocks,lithology is aluminum-rich felsic clay,argillaceous sandstone,argillaceous siltstone,mudstone and shale,etc.,partially interbedded with medium-basic rock volcanic rocks or homogenous condensation.Gray matter clastic rock.The main element indicates that the original rock is a sedimentary chemical component and has the characteristics of a high-silicon,over-aluminum calc-alkaline series.The trace element content showed that Ta,Nb,Sr,P and Ti were obviously depleted,and the large ion lithophile elements Rb,Ba and K were enriched,and U,La,Ce,Nd,Zr and Hf were relatively enriched.The rare earth elements are light rare earth enriched,heavy rare earths are depleted,and have the characteristics of"V"type distribution.The original rock may be sedimentary diagenesis of the mixed sandstone in the continental island arc environment on the active continental margin,and then undergoes multi-stage metamorphism.

关 键 词：阿尔泰造山带 片麻岩 依列克塔斯岩组 副片麻岩 地球化学特征 

分 类 号：P588.345[天文地球—岩石学]