Reconstruction of protoliths of metamorphic rocks and tectonic setting of Wolegen Group

Parametamorphic rocks from Arong County in southeastern Inner Mongolia- Daxinganling district are regarded as Proterozoic in age, belonging to the Wolegen Group and composed of volcanoclastic and sand- stone in origin, and have been disputed in tectonic setting. Because of the stability in metamorphism, the rare earth elements indicate the features of their protoliths. The authors integrated the petrologic methods with the geochemical parameters which include ЕREE, ЕLREE/NHREE, δCe, δEu, La/Yb, Sm/Nd, Th/Sc and the standard values of chondrite. The results show that the protoliths of Wolengen Group may be a group of volcanoclastic and continental margin clastic rocks, and their tectonic setting is the continent island arc.

大兴安岭北部新林地区倭勒根群大网子组锆石LA-ICP-MS U-Pb年龄及其地质意义

大兴安岭位于中亚造山带的东段,自北向南划分为额尔古纳地块、兴安地块和松嫩地块。倭勒根群主体分布于额尔古纳地块,前人将其归属为新元古代-早寒武世。对新林地区倭勒根群大网子组的上部变火山岩段和下部变沉积岩段进行了锆石LA-ICP-MS U-Pb定年。测试结果显示:上部变火山岩的形成年龄为(430.7±4.1)Ma,属早志留世;下部变沉积岩中碎屑锆石的最小峰值年龄为(480.1±2.9)Ma,指示其沉积时间不早于早奥陶世。综合文献资料确定:新林地区倭勒根群浅变质岩系是一套时间跨距从寒武纪到早志留世的岩石地层组合,而非新元古代-早寒武世;新林蛇绿岩的构造侵位时间不早于早奥陶世;新林地区的大网子组、兴隆沟地区的早奥陶世沉积与多宝山-伊尔施早奥陶世火山弧构成了大兴安岭北部地区的早奥陶世弧-盆体系。

大兴安岭呼中地区倭勒根岩群变形特征及构造地层单位的建立

依据大兴安岭呼中地区中浅变质岩系构造变形特征,对其划分了5个构造岩片,其经历了两期构造变形作用的改造,早期伸展构造改变了原始地层的基本结构,晚期收缩体制下强烈的推覆挤压又造成了构造岩片的移位和叠置,从而使地层广泛非史密斯化。根据不同岩石组合变形特征,划分了8个构造地层类型,在此基础上,结合建造组合特征,建立了构造地层单位—吉祥沟岩组和大网子岩组,两岩组并称为倭勒根岩群。