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Petrogenesis of the Early Cretaceous granitoids and its mafic enclaves in the Northern Tengchong Terrane, southern margin of the Tibetan Plateau and its tectonic implications
Jingyi Zhang; Touping Peng; Weiming Fan; GuochunZhao; Xiaohan Dong; Jianfeng Gao; Bingxia Peng; ChaoWei; Xiaoping Xia; Linli Chen; Xirong Liang
2018
发表期刊Lithos
卷号318页码:283-298
摘要

Cretaceous granites are widely exposed in the Tengchong Terrane that is the southern extension of the Tibetan Plateau, resulting from the evolution of the Tethys. They, therefore, play a critical role in deciphering the Tethys evolution and the growth of the Tibetan Plateau. In this paper, we present new zircon U-Pb dating and Hf isotopic results, along with whole-rock elemental and Sr-Nd isotopic data of the granitoids from the Lushui-Pianma (LP) batholith and its mafic enclaves and the strongly deformed granites from the Gaoligong shear zone in the northern Tengchong Terrane. The dating results show that both the LP granitic batholith and the strongly deformed granites in the Gaoligong shear zone formed in the Early Cretaceous of 122-110 Ma. They are composed of granodiorite, quartz monzodiorite and monzogranite with minor gabbroic enclaves. Mineralogically and geochemically, the granitoids in the LP batholith, particularly for the less evolved ones, display a metaluminous nature and an affinity to I-type granite. All the granitoids are characterized by similar rare and trace patterns and whole-rock Nd and zircon Hf isotopic compositions, indicating a common origin. The sodium-rich feature for the less evolved dioritic rocks and the predominantly negative zircon epsilon(Hf)(t) and whole rock epsilon(Nd)(t) values for all the granitoids demonstrate that they were derived mainly from the partial melting of the Mesoproterozoic metabasic rocks (likely the basement rocks of the Gaoligong Group) in the lower crust of the Tengchong Terrane. In the case of the mafic enclaves, they share similar mineralogical assemblages and Nd Hf isotopic compositions to its host granodiorite, indicating a cognate origin with the latter. 

In combination with previous data for the granitoids in the Tengchong Terrane, our study further illustrates that the Early Cretaceous granitic rocks are dominated by metaluminous I-type granites with minor highly fractionated peraluminous I-type granites, rather than the dominant S-type granites as assumed before. The new identification of the Myitkyina Meso-Tethys ophiolitic suite in eastern Myanmar, together with regional Early Cretaceous magmatic and sedimentation patterns, indicate that these Early Cretaceous magmatic rocks were the products of the evolution of the Myitkyina Tethys Ocean, which was related to post-collisional slab breakoff.

关键词Early Cretaceous Na-rich Granitoids Maficenclave Tengchong Terrane Myitkyina Tethys Ocean
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8901
专题矿床地球化学国家重点实验室
作者单位1.State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
4.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
推荐引用方式
GB/T 7714
Jingyi Zhang,Touping Peng,Weiming Fan,et al. Petrogenesis of the Early Cretaceous granitoids and its mafic enclaves in the Northern Tengchong Terrane, southern margin of the Tibetan Plateau and its tectonic implications[J]. Lithos,2018,318:283-298.
APA Jingyi Zhang.,Touping Peng.,Weiming Fan.,GuochunZhao.,Xiaohan Dong.,...&Xirong Liang.(2018).Petrogenesis of the Early Cretaceous granitoids and its mafic enclaves in the Northern Tengchong Terrane, southern margin of the Tibetan Plateau and its tectonic implications.Lithos,318,283-298.
MLA Jingyi Zhang,et al."Petrogenesis of the Early Cretaceous granitoids and its mafic enclaves in the Northern Tengchong Terrane, southern margin of the Tibetan Plateau and its tectonic implications".Lithos 318(2018):283-298.
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