Geochemical Ar-40/Ar-39 geochronological and Sr-Nd isotopic constraints on the origin of Paleoproterozoic mafic dikes from the southern Taihang Mountains and implications for the ca. 1800 Ma event of the North China Craton
文献类型：期刊论文
| 作者 | Wang, YJ; Fang, WM; Zhang, YH; Guo, F; Zhang, HF; Peng, TP |
| 刊名 | PRECAMBRIAN RESEARCH
 |
| 出版日期 | 2004-11-10 |
| 卷号 | 135期号:1-2页码:55-77 |
| 关键词 | geochemistry Ar-40/Ar-39 geochronology Paleoproterozoic mafic dikes similar to 1800 Ma event Southern Taihang Mountains North China Craton |
| ISSN号 | 0301-9268 |
| DOI | 10.1016/j.precamres.2004.07.005 |
| 文献子类 | Article |
| 英文摘要 | The wide occurrence of Paleoproterozoic mafic dikes in the basement of the Trans-North China Orogen provides important constraints on the major similar to 1800 Ma tectonothermal event of the North China Craton. These matic dikes form a tholeiitic series dominated by basalts and basaltic andesites, and can be geochemically classified into three groups: The Groups I and 2 rocks are characterized by high total FeO contents (12.69-15.64 %), of which the Group I rocks are more enriched in LILE and LREE contents and depleted in HFSE ((Th/Nb)n = 2.5-3.8, (La/Yb)cn = 3.0-5.8; (Nb/La)n = 0.27-0.38) and have more radiogenic Nd isotopic ratios (E-Nd(t) = -3.40 to -5.14), than the Group 2 rocks ((Th/Nb)n = 0.8-1.2, (La/Yb)cn = 1.5-2.1, (Nb/La)n = 0.65-0.87, E-Nd(t) = -0.60 to -1.67). In contrast, the Group 3 rocks are typified by low FeOt (7.86-11.04%) and high MgO (5.62-9.56%) contents. Higher (La/Yb)cn (4.22-7.13) ratios, less radiogenic Nd isotopic ratios (E-Nd(t) = -2.75 to -5.52), and more significant Th-U and Nb-Ta depletion are also apparent features. Ar-40/Ar-39 geochronology of three representative samples from each group yielded plateau ages of 1780.7 +/- 0.5 Ma, 1765.3 +/- 1.1 Ma and 1774.7 +/- 0.7 Ma, respectively. These elemental and isotopic data suggest that the geochemical variations of these rocks cannot be simply explained by crystallization from a common parental magma involving crustal contamination during emplacement. Instead, they most likely originated from variable sources under different degrees of partial melting. The Group I rocks were derived from relatively low degrees of partial melting of a refractory lithospheric mantle previously metasomatised by subduction-related fluids, whereas the Group 2 rocks originated from a hybridized source involving ca. 40% subduction-modified lithospheric mantle, similar to the Group 1, and ca.60% (C) 2004 Elsevier B.V. All rights reserved. |
| WOS关键词 | ZANHUANG METAMORPHIC DOMAIN ; TECTONIC EVOLUTION ; FUPING COMPLEX ; TRACE-ELEMENT ; LITHOSPHERE INTERACTIONS ; GREENSTONE-BELT ; VOLCANIC-ROCKS ; MAUNA-LOA ; PB ; BASALTS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000224726200003 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79745]  |
| 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, Guangzhou 510640, Peoples R China 2.CSIRO Explorat & Min, Bentley, WA 6102, Australia 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, YJ,Fang, WM,Zhang, YH,et al. Geochemical Ar-40/Ar-39 geochronological and Sr-Nd isotopic constraints on the origin of Paleoproterozoic mafic dikes from the southern Taihang Mountains and implications for the ca. 1800 Ma event of the North China Craton[J]. PRECAMBRIAN RESEARCH,2004,135(1-2):55-77. |
| APA | Wang, YJ,Fang, WM,Zhang, YH,Guo, F,Zhang, HF,&Peng, TP.(2004).Geochemical Ar-40/Ar-39 geochronological and Sr-Nd isotopic constraints on the origin of Paleoproterozoic mafic dikes from the southern Taihang Mountains and implications for the ca. 1800 Ma event of the North China Craton.PRECAMBRIAN RESEARCH,135(1-2),55-77. |
| MLA | Wang, YJ,et al."Geochemical Ar-40/Ar-39 geochronological and Sr-Nd isotopic constraints on the origin of Paleoproterozoic mafic dikes from the southern Taihang Mountains and implications for the ca. 1800 Ma event of the North China Craton".PRECAMBRIAN RESEARCH 135.1-2(2004):55-77. |
入库方式： OAI收割
来源：地质与地球物理研究所
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