东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

Grenvillian oroseny in the Southern Cathaysia Block： Constraints from U-Pb ages and Lu-Hf isotopes in zircon from metamorphic basement

ISSN号：0379-1726
期刊名称：《地球化学》
时间：0
分类：P58[天文地球—岩石学;天文地球—地质学]
作者机构：[1]State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China, [2]GEMOC National Key Centre, Department of Earth and Planetary Science, Macquarie University, Sydney, NSW 2109, Australia
相关基金：Supported by the National Natural Science Foundation of China （Grant Nos. 40634022, 40221301 and 40672125）. This is publication No. 511 from the National Key Centre for Geochemical Evolution and Metallogeny of Continents.We thank Norman Pearson and Suzie Elhlou for their assistance in LAM-ICPMS and LAM-MC-ICPMS analyses at the GEMOC Key Centre, Macquarie University, Australia. Tan Zhengzhong, Xie Lei and Zhao Lei are thanked for field investigation and zircon separation. The authors also thank the editor and two anonymous reviewers for helpful reviews and valuable comments.

作者： WANG LiJuan[1,2], YU JinHai[1,2], S.Y. O'REILLY[2], W.L. GRIFFIN[2], SUN Tao[1], WEI ZhenYang[1], JIANG ShaoYong[1], SHU LiangShu[1]

关键词：华夏古大陆, 格伦维尔期, 锆石, 同位素, 新元古代, Cathaysia Block, Grenvillian orogeny, zircon U-Pb age, Lu-Hf isotope, Neoproterozoic Rodinia supercontinent

中文摘要：

在卡赛西亚·布洛克的变形地下室岩石与不同年龄主要由元沉积组成。从元沉积的岩石的新锆石 U-Pb geochronological 结果在 Zengcheng 和 Hezi 区域暴露了，南部的卡赛西亚·布洛克，他们由早 Neoproterozoic ( 1.0-0.9 Ga )主导地组成的表演有次要的 Paleo Mesoproterozoic 的材料和迟了的 Neoproterozoic ( 0.8-0.6 Ga )部件，建议岩屑主要来自 Grenvillian orogen 。最年轻的由岩屑形成的锆石年龄在迟了的 Neoproterozoic 把限制放在这些沉积的免职时间上。锆石 Hf 同位素的作文显示 Grenvillian 锆石从 Mesoproterozoic 弧 magmatic 岩石和 Paleoproterozoic 大陆人外壳重做被导出，暗示一个弧大陆 collisional 背景。单个山峰的年龄系列和丰富的 euhedral Grenvillian 锆石的存在建议沉积起源不是远的离开样品地点。因此， Grenvillian orogen 可能沿着卡赛西亚·布洛克的南部的边缘先存在，或很近到南方。Grenvillian 造山运动的年龄和在有印度和东方南极的华南的 Gondwana 的集会的影响的类似被讨论，与华南更多半与在早 Neoproterozoic 而非在西方的 Laurentia 和东方澳大利亚之间的印度东方南极洲大陆被连接的建议。

英文摘要：

Metamorphic basement rocks in the Cathaysia Block are composed mainly of meta-sediments with different ages. New zircon U-Pb geochronological results from the meta-sedimentary rocks exposed in the Zengcheng and Hezi areas, southern Cathaysia Block, show that they consist dominantly of early Neoproterozoic （1.0-0.9 Ga） materials with minor Paleo- to Mesoproterozoic and late Neoproterozoic （0.8-0.6 Ga） components, suggesting that the detritus mostly come from a Grenvillian orogen. The youngest detrital zircon ages place a constraint on the deposition time of these sediments in Late Neoproterozoic. Zircon Hf isotopic compositions indicate that the Grenvillian zircons were derived from the reworking of Mesoproterozoic arc magmatic rocks and Paleoproterozoic continental crust, implying an arc-continent collisional setting. Single-peak age spectra and the presence of abundant euhedral Grenvillian zircons suggest that the sedimentary provenance is not far away from the sample location. Thus, the Grenvillian orogen probably preexisted along the southern margin of the Cathaysia Block, or very close to the south. Similarity in the ages of Grenvillian orogeny and the influence of the assembly of Gondwana in South China with India and East Antarctic are discussed, with suggestion that South China was more likely linked with the India-East Antarctica continents in Early Neoproterozoic rather than between western Laurentia and eastern Australia.