| U-Pb zircon geochronology, geochemical, and Sr-Nd isotopic constraints on the age and origin of basaltic porphyries from western Liaoning Province, China | |
Guangying Feng; Shen Liu ; Hong Zhong; Caixia Feng; Ian M. Coulson; Youqiang Qi; Yuhong Yang; Chaogui Yang
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| 通讯作者 | Shen Liu |
| 2012 | |
| 发表期刊 | International Geology Review
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| 卷号 | 54期号:9页码:1052-1070 |
| 摘要 | Basaltic porphyries from the northeast North China craton (NCC) provide an excellent opportunity to examine the nature of their mantle source and the secular evolution of the underlying mantle lithosphere. In addition, the study helps to constrain the age and the mechanism of NCC lithospheric destruction. In this paper, we report geochronological, geochemical, and Sr-Nd isotopic analyses of a suite of mafic lavas. Detailed laser ablation-inductively coupled plasma-mass spectrometry (LA ICP MS) zircon U Pb dating yielded an age of 223.3 +/- 1.1 million years, which we regard as representing the crystallization age of the basaltic porphyries. The bulk-rock analysed samples are enriched in both large ion lithophile elements (LILEs) (i.e. Ba, Sr, and Pb) and light rare earth elements (LREEs), but depleted in high field strong elements (HFSEs) (i.e. Nb, Ta, Zr, Hf, and Ti) and heavy rare earth elements (HREEs), without significant Eu anomalies (Eu/Eu* = 089 0.98). The basaltic porphyries have undergone low degrees (similar to 5%) of partial melting of a garnet-bearing lherzolite mantle. The rocks display very uniform (Sr-87/Sr-86)(i) (0.70557-0.70583) and negative epsilon(Nd) (t) values (-11.9 to -10.1). These features indicate that the western Liaoning basaltic porphyries were derived from a common enriched lithosphere mantle that had previously been metasomatized by fluids related to subduction of Palaeo-Asian sedimentary units. However, the mafic melts were not affected to a significant degree by crustal contamination. Based on earlier studies, these findings provide new evidence that the northeast margin of the NCC had undergone a phase of post-orogenic extensional tectonics during the Middle Triassic. Furthermore, lithospheric thinning occurring across the northern NCC might have been initiated during Early Triassic times and was likely controlled by the final closure of the Palaeo-Asian Ocean, as well as the collision of Mongolian arc terrenes with the NCC. |
| 关键词 | Major And Trace Elements Sr–nd Isotopes Basaltic Porphyries Early Mesozoic Western Liaoning Province Northeast North China Craton |
| 学科领域 | 矿床地球化学 |
| 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/352002/4842 |
| 专题 | 矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文 矿床地球化学国家重点实验室 |
| 通讯作者 | Shen Liu |
| 推荐引用方式 GB/T 7714 | Guangying Feng,Shen Liu,Hong Zhong,et al. U-Pb zircon geochronology, geochemical, and Sr-Nd isotopic constraints on the age and origin of basaltic porphyries from western Liaoning Province, China[J]. International Geology Review,2012,54(9):1052-1070. |
| APA | Guangying Feng.,Shen Liu.,Hong Zhong.,Caixia Feng.,Ian M. Coulson.,...&Chaogui Yang.(2012).U-Pb zircon geochronology, geochemical, and Sr-Nd isotopic constraints on the age and origin of basaltic porphyries from western Liaoning Province, China.International Geology Review,54(9),1052-1070. |
| MLA | Guangying Feng,et al."U-Pb zircon geochronology, geochemical, and Sr-Nd isotopic constraints on the age and origin of basaltic porphyries from western Liaoning Province, China".International Geology Review 54.9(2012):1052-1070. |
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