Alkaline basalts in the Karamay ophiolitic melange, NW China: A geological, geochemical and geochronological study and implications for geodynamic setting
文献类型：期刊论文
| 作者 | Yang, Gaoxue1,2; Li, Yongjun1,2; Santosh, M.3; Xiao, Wenjiao4,5; Yang, Baokai2; Tong, Lili1,2; Zhang, Shenglong2 |
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2015-12-01 |
| 卷号 | 113页码:110-125 |
| 关键词 | Ophiolitic Melange Mantle Plume Zircon Geochronology Geochemistry West Junggar Central Asian Orogenic Belt |
| DOI | 10.1016/j.jseaes.2014.08.017 |
| 文献子类 | Article |
| 英文摘要 | Alkaline basalts are common constituents in many ophiolite belts and accretionary complexes. Here we report geological, geochronological, geochemical, and whole-rock Sr-Nd isotopic data for alkaline basalts from the Karamay ophiolitic melange of West Junggar, southern Central Asian Orogenic Belt (CAOB). In the ophiolitic melange, imbricate thrusts, duplexes, "web" structures, pinch-and-swell structures, tilted structures in pillow metabasalts, and shear band cleavages are widely developed. U-Pb analyses of zircon grains from a representative basalt by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) yielded crystallization age of ca. 395 +/- 3 Ma, suggesting formation during the Middle Devonian. Geochemically, all the samples bear the signature of ocean island basalt (OIB), and are characterized by alkaline affinity with high concentrations of Na2O + K2O (4.22-7.28 wt.%) and TiO2 (1.72-2.89 wt.%), LILE and LREE enrichment and HREE depletion ((La/Yb)(N) = 8.4-15.6), with very strong or no Eu anomalies (Eu/Eu* = 0.6-1.1), and no obvious Nb, Ta or Ti negative anomalies. The rocks display consistent Sr-Nd isotopic compositions (initial Sr-87/Sr-86 ratios = 0.70326-0.70453, epsilon Nd(t) = + 3.1-+7.6). The results suggest that all the alkaline basalts were derived from a mantle plume-related source in an intra-oceanic setting with ca. 1-3% degree partial melting of garnet Iherzolite. These observations, in combination with previous work, indicate that the alkaline basalts from Karamay ophiolitic melange can be correlated to a Middle Devonian mantle plume-related magmatism within Paleo-Asian Ocean. We further suggest that the plume-related activity in the CAOB was generally continuous during the development of the Paleo-Asian Ocean. (c) 2014 Elsevier Ltd. All rights reserved. |
| WOS关键词 | ASIAN OROGENIC BELT ; POZANTI-KARSANTI OPHIOLITE ; LARGE IGNEOUS PROVINCE ; WEST JUNGGAR REGION ; VOLCANIC-ROCKS ; ACCRETIONARY COMPLEX ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; NORTHWEST CHINA |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000367406200009 |
| 资助机构 | National Nature Science Foundation of China(41303027 ; National Nature Science Foundation of China(41303027 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(2014G1271058) ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(2014G1271058) ; UNESCO-IUGS(592) ; UNESCO-IUGS(592) ; 41230207 ; 41230207 ; 41390441 ; 41390441 ; 41190075) ; 41190075) ; National Nature Science Foundation of China(41303027 ; National Nature Science Foundation of China(41303027 ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(2014G1271058) ; Special Fund for Basic Scientific Research of Central Colleges, Chang'an University(2014G1271058) ; UNESCO-IUGS(592) ; UNESCO-IUGS(592) ; 41230207 ; 41230207 ; 41390441 ; 41390441 ; 41190075) ; 41190075) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62132]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Minist Educ, Key Lab Western Chinas Mineral Resources & Geol E, Xian 710054, Peoples R China 2.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China 3.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 4.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Chinese Acad Sci, Xinjiang Res Ctr Mineral Resources, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Gaoxue,Li, Yongjun,Santosh, M.,et al. Alkaline basalts in the Karamay ophiolitic melange, NW China: A geological, geochemical and geochronological study and implications for geodynamic setting[J]. JOURNAL OF ASIAN EARTH SCIENCES,2015,113:110-125. |
| APA | Yang, Gaoxue.,Li, Yongjun.,Santosh, M..,Xiao, Wenjiao.,Yang, Baokai.,...&Zhang, Shenglong.(2015).Alkaline basalts in the Karamay ophiolitic melange, NW China: A geological, geochemical and geochronological study and implications for geodynamic setting.JOURNAL OF ASIAN EARTH SCIENCES,113,110-125. |
| MLA | Yang, Gaoxue,et al."Alkaline basalts in the Karamay ophiolitic melange, NW China: A geological, geochemical and geochronological study and implications for geodynamic setting".JOURNAL OF ASIAN EARTH SCIENCES 113(2015):110-125. |
入库方式： OAI收割
来源：地质与地球物理研究所
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