Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi, Hebei and Inner Mongolia
文献类型：期刊论文
| 作者 | Peng, P; Zhai, MG; Zhang, HF; Zhao, TP; Ni, ZY |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2004-05-01 |
| 卷号 | 20期号:3页码:439-456 |
| 关键词 | mafic dyke swarms North China Craton 1. 8 Ga petrology geochemistry |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The 1.8 Ga dyke swarms in the North China Craton are among the largest ones in China. In the juncture of Shanxi, Hebei, and Inner-Mongolia, they presented as NNW and EW-oriented vertical to subvertical dykes with chilled margins from a uniform tectonic setting. The dykes are up to tens of kilometers in length, and 0.5 to 100 m in width. Three dyke swarms, S-I, S-II, and S-EW, are identified. They consist of clinopyroxene and plagioclase as rock forming minerals, and accessory amphibole, Fe-Ti oxides, biotite, apatite, alkaline-feldspar, and quartz as minor minerals. S-II is characterized by olivine phenocrysts and orthopyroxene + amphibole rim structures around olivine and clinopyroxene. S-I is tholeiite relatively high in MgO, with relatively low FeO (total) - TiO2 - P2O5; while S-II varies in composition from alkaline to sub-alkaline high-Fe basalt, with high FeO (total) - TiO2 - P2O5. S-EW includes high-Fe tholeiite basalt and andesite. All dykes have high total rare earth elements, and the light rare earth elements in dykes are enriched. They are relatively enriched in Ba, K, and P, and depleted in Nb and Ta in primitive mantle normalized diagrams. S-II and S-EW are depleted in Sr. S-I exhibits various degrees of partial melting, with slight fractionation and crustal assimilation. And S-II shows an iron-enriched and silica-poor trend ( the Fenner trend) and crustal assimilation. While S-EW performs a siliea-rich and iron-poor trend ( the Bowen trend) with strong crustal assimilation. We suggest that there are multiple sources, and the dyke swarms initiated the continental break-up, possibly associated with a plume. |
| WOS关键词 | CONTINENTAL FLOOD BASALTS ; VOLCANIC-ROCKS ; TECTONIC EVOLUTION ; OCEANIC-CRUST ; MANTLE ; CONSTRAINTS ; EVENTS ; SUPERCONTINENT ; AMALGAMATION ; BREAKUP |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000222897200008 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79515]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Peng, P |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China 3.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China |
| 推荐引用方式 GB/T 7714 | Peng, P,Zhai, MG,Zhang, HF,et al. Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi, Hebei and Inner Mongolia[J]. ACTA PETROLOGICA SINICA,2004,20(3):439-456. |
| APA | Peng, P,Zhai, MG,Zhang, HF,Zhao, TP,&Ni, ZY.(2004).Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi, Hebei and Inner Mongolia.ACTA PETROLOGICA SINICA,20(3),439-456. |
| MLA | Peng, P,et al."Geochemistry and geological significance of the 1.8 Ga mafic dyke swarms in the North China Craton: an example from the juncture of Shanxi, Hebei and Inner Mongolia".ACTA PETROLOGICA SINICA 20.3(2004):439-456. |
入库方式： OAI收割
来源：地质与地球物理研究所
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