Nature of the Mesozoic lithospheric mantle and tectonic decoupling beneath the Dabie Orogen, Central China: Evidence from Ar-40/Ar-39 geochronology, elemental and Sr-Nd-Pb isotopic compositions of early Cretaceous mafic igneous rocks
文献类型：期刊论文
| 作者 | Wang, YJ; Fan, WM; Peng, TP; Zhang, HF; Guo, F |
| 刊名 | CHEMICAL GEOLOGY
 |
| 出版日期 | 2005-08-05 |
| 卷号 | 220期号:3-4页码:165-189 |
| 关键词 | Ar-40/ar-39 Geochronology Sr-nd-pb Isotopes Early Cretaceous Basic-intermediate Rocks Continental Lithospheric Mantle Tectonic Decoupling Dabic Orogen |
| ISSN号 | 0009-2541 |
| DOI | 10.1016/j.chemgeo.2005.02.020 |
| 文献子类 | Article |
| 英文摘要 | Geochronological, elemental and Sr-Nd-Pb isotopic data of early Cretaceous basic-intermediate rocks from the Dabie Orogen provide new insights into the nature of the late Mesozoic lithospheric mantle beneath the region and its tectonic relationship with neighboring blocks. Basic-intermediate rocks from the North Dabie Complex (NDC) include diabases, lamprophyres and trachyandesites, which have Ar-40/Ar-39 plateau ages of 127.6-131.8 Ma. Similar rock types from the North Huaiyang Unit (NHY) erupted at nearly the same time (135-116 Ma). Coeval rocks from both tectonic units form a continuous array in Harker diagrams, and exhibit similar geochemical characteristics. Both are significantly enriched in LILEs, and depleted in HFSEs, coupled with very low epsilon(Nd) (t), (Pb-206/Pb-204)(i), and prominent positive Delta 8/4 and Delta 7/4 values, which are similar to those of Mesozoic mafic rocks in the North China Craton (NCC) exterior. These geochemical signatures are inconsistent with crustal contamination during magma ascent, and reflect derivation from an enriched lithospheric mantle source contaminated by the deeply subducted Yangtze crust. The observed geochemical similarities thus suggest that early Cretaceous igneous rocks from the NDC and NHY share a similar continental lithospheric mantle source that is tectonically affiliated to the NCC, although the surface geology of both tectonic units correlates with that of the Yangtze Block. Tectonic decoupling along a suture is proposed to explain the generation of early Cretaceous mafic rocks in the Dabie Orogen. The Wuhe-Shuihou fault likely represents the Mesozoic lithospheric boundary between the Yangtze Block and NCC, despite the fact that the present-day surface suture is situated at the Xiaotian-Mozitan fault or other faults to the north. (c) 2005 Elsevier B.V All rights reserved. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; CRUSTAL-DETACHMENT MODEL ; EAST-CENTRAL CHINA ; NORTH CHINA ; SOUTH CHINA ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; TANLU FAULT ; CENOZOIC BASALTS ; YANGTZE CRATON |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000230985400001 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65382]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wang, YJ |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, YJ,Fan, WM,Peng, TP,et al. Nature of the Mesozoic lithospheric mantle and tectonic decoupling beneath the Dabie Orogen, Central China: Evidence from Ar-40/Ar-39 geochronology, elemental and Sr-Nd-Pb isotopic compositions of early Cretaceous mafic igneous rocks[J]. CHEMICAL GEOLOGY,2005,220(3-4):165-189. |
| APA | Wang, YJ,Fan, WM,Peng, TP,Zhang, HF,&Guo, F.(2005).Nature of the Mesozoic lithospheric mantle and tectonic decoupling beneath the Dabie Orogen, Central China: Evidence from Ar-40/Ar-39 geochronology, elemental and Sr-Nd-Pb isotopic compositions of early Cretaceous mafic igneous rocks.CHEMICAL GEOLOGY,220(3-4),165-189. |
| MLA | Wang, YJ,et al."Nature of the Mesozoic lithospheric mantle and tectonic decoupling beneath the Dabie Orogen, Central China: Evidence from Ar-40/Ar-39 geochronology, elemental and Sr-Nd-Pb isotopic compositions of early Cretaceous mafic igneous rocks".CHEMICAL GEOLOGY 220.3-4(2005):165-189. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。