摘要
通过对新疆阿尔泰西北部喀纳斯群贝留特岩组进行野外地质填图和综合研究,发现该地层发育带状和环状巴罗式递增变质带,即黑云母带、红柱石带、十字石-矽线石带。对贝留特岩组结晶片岩进行岩石特征、地球化学特征、原岩恢复、物质来源和变质成因分析研究表明,贝留特岩组为副变质岩,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,沉积于被动大陆边缘环境。地球化学特征显示,岩石具高硅、过铝质钙碱性系列特征,稀土元素分布图呈右倾模式,轻稀土富集的“V”型特征。微量元素具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相对富集特征。认为贝留特岩组在中寒武—早奥陶世形成,物源来源于活动大陆边缘的大陆岛弧环境,由加里东期和海西期两期区域动力热流变质作用形成。
Through detailed field geological mapping and comprehensive research on the Beiliuteformation of the Kanas Group in northwestern Altay,Xinjiang,it was discovered that the strata developed belt-like and annular Barrowtype progressive metamorphic belts,namely biotite belt,andalusite belt,Cross stone-sillimanite belt.Analysis of rock characteristics,geochemical characteristics,recovery of original rocks,material sources and metamorphic genesis of the crystalline schist of the Beiliuteformation shows that the Beretite Formation is parametamorphic rock,the original rock is sedimentary rock,and the lithology is aluminum-rich The felsic clay,argillaceous sandstone,argillaceous siltstone,mudstone and shale are deposited in the passive continental marginal environment.Geochemical characteristics show that it has high-silicon and peraluminous calcium-alkaline series characteristics,the rare earth element distribution diagram shows a right-inclined pattern,the light rare earth is enriched in a"V"type characteristic,and the trace elements have obvious losses of Ta,Nb,Sr,P and Ti,Rb,Ba and K are enriched in large ion philophile elements,and U,La,Ce,Nd,Zr and Hf are relatively enriched.It is believed that the Beiliuteformation was formed in the Middle Cambrian-Early Ordovician,and the source is the continental island arc environment on the active continental margin,which was formed by the dynamic heat flow metamorphism of the Caledonian and Hercynian.
作者
郑加行
赵同阳
韩琼
李平
孙耀锋
唐智
Zheng Jiaxing;Zhao Tongyang;Han Qiong;Li Ping;Sun Yaofeng;Tang Zhi(Xinjiang Institute of Geological Survey,Urumqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第4期439-449,共11页
Xinjiang Geology
基金
新疆区域地质调查片区总结与服务产品开发(DD18-060)
新疆维吾尔自治区区域地质志(DD19-23)
新疆区域地质志、矿产志研编(Y19-1-XJ001)
国家重点研发计划深地专题清白山铅锌矿集区资源预测(2018YFC0604005-03)
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。
关键词
北阿尔泰造山带
贝留特岩组
结晶片岩
递增变质带
Northern Altai Orogen
Beiliute formation
Crystalline Schist
Progressive metamorphic zone
