Grenvillian orogeny in the Southern Cathaysia Block: Constraints from U-Pb ages and Lu-Hf isotopes in zircon from metamorphic basement
Grenvillian orogeny in the Southern Cathaysia Block: Constraints from U-Pb ages and Lu-Hf isotopes in zircon from metamorphic basement
复制标题
华夏地块南部格伦维尔造山运动：变质基底锆石U-Pb年龄和Lu-Hf同位素的制约
DOI：
10.1007/s11434-008-0262-0
复制
发表时间：
2008-08
期刊：
影响因子：
--
通讯作者：
Sun Tao
中科院分区：
文献类型：
--
作者：
O'Reilly, S. Y.;Wang LiJuan;Yu JinHai;Jiang ShaoYong;Wei ZhenYang;Griffin, W. L.;Shu LiangShu;Sun Tao
华夏地块变质基底岩主要由不同时代的变质沉积组成。华夏地块南部增城和河子地区出露的变质沉积岩的新的锆石U-Pb年代学结果表明，它们主要由早新元古代(1.0-0.9Ga)物质组成，并有少量的古元古代至中元古代和晚新元古代(0.8-0.6Ga)组分，表明碎屑主要来自格伦维利亚造山带。最年轻的碎屑锆石年龄限制了这些沉积物在新元古代晚期的沉积时间。锆石Hf同位素组成表明，格伦维利期锆石来自中元古代弧形岩浆岩和古元古代陆壳的改造，暗示了弧陆碰撞环境。单峰年龄谱和丰富的整面体格勒维利安锆石的存在表明，沉积物源距离样品位置不远。因此，格勒维利亚造山带可能已存在于华夏地块南缘，或非常靠近南方。讨论了新元古代早期格勒维利亚造山作用时代的相似性以及南中国冈瓦那拼接与印度和东南极的影响，认为新元古代早期南中国更有可能与印度-东南极大陆联系在一起，而不是在西劳伦蒂亚和澳大利亚东部之间。
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.
登录
查看更多内容
影响因子：
3.8
作者：
P. Pinna;G. Jourde;J. Calvez;J. Mroz;J. Marques
通讯作者：
P. Pinna;G. Jourde;J. Calvez;J. Mroz;J. Marques
影响因子：
3.8
作者：
Xian‐Hua Li;Jian-xin Zhao;M. McCulloch;Guoqing Zhou;Fengjuan Xing
通讯作者：
Xian‐Hua Li;Jian-xin Zhao;M. McCulloch;Guoqing Zhou;Fengjuan Xing
影响因子：
3.8
作者：
S. Boger
通讯作者：
S. Boger
影响因子：
5.8
作者：
R. Larson
通讯作者：
R. Larson
影响因子：
56.9
作者：
E. Scherer;C. Münker;K. Mezger
通讯作者：
E. Scherer;C. Münker;K. Mezger