Petrogenesis of Cretaceous shoshonitic rocks in the northern Wuyi Mountains, South China: A result of the roll-back of a flat-slab?
文献类型：期刊论文
| 作者 | Li, Wu-Xian1; Li, Xian-Hua2; Wang, Xuan-Ce3,4; Yang, Dong-Sheng5 |
| 刊名 | LITHOS
 |
| 出版日期 | 2017-09-01 |
| 卷号 | 288页码:125-142 |
| 关键词 | Potassic magmatism Shoshonitic rocks Flat-slab delamination Early Cretaceous South China |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2017.06.014 |
| 文献子类 | Article |
| 英文摘要 | Potassic magmatism is commonly linked to post-/late-orogenic environments, such as foundering or convection thinning of continental lithosphere. Their petrogenesis is crucial for constraining the chemical and physical properties of the remnant sub-continental lithospheric mantle. Here we report new SHRIMP zircon U-Pb ages, whole rock geochemical results and Sr-Nd and zircon Hf isotope data from four potassic plutons (the Da'an, Yingcheng, Zixi and Honggong plutons) in the northern Wuyi Mountains, South China. SHRIMP U-Pb zircon analyses indicate that these potassic rocks formed at 139-126 Ma. They are characterized by high SiO2 (56-73%) and K2O (3.8-6.7%), with a K2O/Na2O ratio of 2.18-2.04, plotting within the field of high-SiO2 shoshonites. Their 'Sr and epsilon Nd(t) values vary from 0.7077 to 0.7162 and -5.66 to -10.52, respectively. The initial zircon epsilon Hf(t) values range from 23 to 13.1, corresponding to TOM modal ages between 707 and 1330 Ma. These geochemical and isotope characteristics indicate that these shoshonites derived from a subduction-modified ancient subcontinental lithospheric mantle, and then underwent significantly fractional crystallization of K-feldspar, plagioclase, and accessory minerals, such as apatite and Fe-Ti oxides during magma ascent. We interpret that asthenospheric mantle upwelling (caused by eastward roll-back of a flat-slab?) triggered partial melting of the metasomatized lithospheric mantle to result in the Early Cretaceous shoshonitic magmatism in the northern Wuyi Mountains. An integration of our new results with compiled data from the interior of the South China Block reveals that the arc-like geochemical signature is confined to the Wuyi Mountains region, but becomes little or even invisible toward inland in South China. This implies that the far-field effects of the early Mesozoic subduction only reached the Wuyi Mountains, ca. 500 km away from the trench, consistent with flat or shallow subduction models. (C) 2017 Elsevier B.V. All rights reserved. |
| WOS关键词 | U-PB GEOCHRONOLOGY ; ABSAROKA VOLCANIC PROVINCE ; SOUTHEASTERN CHINA ; SE CHINA ; TECTONIC SIGNIFICANCE ; JIANGXI PROVINCE ; GEOCHEMICAL VARIATIONS ; COLORADO PLATEAU ; CATHAYSIA BLOCKS ; CONTINENTAL RIFT |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000411546000008 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/61950]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Li, Wu-Xian |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotop Geochem, Guangzhou 510640, Guangdong, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Curtin Univ, Dept Appl Geol, Inst Geosci Res TIGeR, GPO Box U1987, Perth, WA 6845, Australia 4.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Shanxi, Peoples R China 5.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Wu-Xian,Li, Xian-Hua,Wang, Xuan-Ce,et al. Petrogenesis of Cretaceous shoshonitic rocks in the northern Wuyi Mountains, South China: A result of the roll-back of a flat-slab?[J]. LITHOS,2017,288:125-142. |
| APA | Li, Wu-Xian,Li, Xian-Hua,Wang, Xuan-Ce,&Yang, Dong-Sheng.(2017).Petrogenesis of Cretaceous shoshonitic rocks in the northern Wuyi Mountains, South China: A result of the roll-back of a flat-slab?.LITHOS,288,125-142. |
| MLA | Li, Wu-Xian,et al."Petrogenesis of Cretaceous shoshonitic rocks in the northern Wuyi Mountains, South China: A result of the roll-back of a flat-slab?".LITHOS 288(2017):125-142. |
入库方式： OAI收割
来源：地质与地球物理研究所
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