Elemental geochemistry and tectonic significance of Cambrian basalts from the northern side of the Nalati Mountain
文献类型：期刊论文
| 作者 | Qian Qing; Xu ShouLi; He GuoQi; Klemd, Reiner; Xiong XianMing; Long LingLi; Gao Jun |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2007-07-01 |
| 卷号 | 23期号:7页码:1708-1720 |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | This paper reports the major and trace elemental compositions of Cambrian (516.3 +/- 7.4Ma) tholeiitic basalts from the northern side of the North Nalati fault (NNF) in the Chinese southwestern Tianshan Mountains. The basalts are typical transitional (T-) type mid-ocean ridge basalts (MORB), characterized with low Al(2)O(3) (12.71% similar to 14. 14%) and P(2)O(5) (0. 09% similar to 0. 21%), moderate TiO(2)(1.39% similar to 2.35%) and MgO (5.35% similar to 8. 14%) and high total Fe (11.74% similar to 16.03% as Fe(2)O(3)) contents, as well as flat chondrite-normalized rare earth element (REE) patterns. (La/Sm) r, and (Y/Nb) (N) ratios are close to unit, also substantiating a T-MORB affinity. Crustal contamination and subduction fluid activity are not evidenced by the low Th/Ta ratios (0. 8 similar to 1. 5) and lack of depletion of high field strength elements (Nb, Ta, Zr, Hf and P). Some T-MORB samples have relatively enriched iron and titanium and lower Mg # (0. 40 similar to 0. 49) and Cr (53 x 10 (-6) similar to 110 x 10 -6) values, and can be classified as Fe-Ti basalts (ferrobasalts), which are defined as having FeO(T) > 12%, TiO(2) > 2% and FeO(T)/MgO > 1. 75. The Fe-Ti basalts were most likely produced from the MORB-type magma through relatively high degree of Fenner trend differentiation at a propagating spreading centre of mid-ocean ridge. The T-MORB and Fe-Ti basalts are believed to be counterparts of the Terskey ophiolite belt along the southern margin of Kyrgyzstan Northern Tianshan, and consequently fragments of the Terskey ophiolites. We propose that (1) the Terskey ocean developed in the Chinese southwestern Tianshan region in Cambrian; (2) the NNF is the eastern extension of the Nikolaev Line, and represents an early Paleozoic suture zone formed by closure of the Terskey ocean. |
| WOS关键词 | WESTERN TIANSHAN MOUNTAINS ; CARBONIFEROUS VOLCANIC-ROCKS ; MIDOCEAN RIDGE BASALTS ; CHINESE TIEN-SHAN ; NW CHINA ; SOUTHERN TIANSHAN ; CENTRAL-ASIA ; NORTHWESTERN CHINA ; PROPAGATING-RIFT ; AGE CONSTRAINTS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000249590500016 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/68216]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Qian Qing |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Bur Jiangsu Petro Survey, Yangzhou 225009, Peoples R China 3.Peking Univ, Sch Earth & Space Sci, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China 4.Univ Wurzburg, Mineral Inst, D-97074 Wurzburg, Germany 5.Guizhou Univ, Coll Resources & Environm Engn, Guigang 550003, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian Qing,Xu ShouLi,He GuoQi,et al. Elemental geochemistry and tectonic significance of Cambrian basalts from the northern side of the Nalati Mountain[J]. ACTA PETROLOGICA SINICA,2007,23(7):1708-1720. |
| APA | Qian Qing.,Xu ShouLi.,He GuoQi.,Klemd, Reiner.,Xiong XianMing.,...&Gao Jun.(2007).Elemental geochemistry and tectonic significance of Cambrian basalts from the northern side of the Nalati Mountain.ACTA PETROLOGICA SINICA,23(7),1708-1720. |
| MLA | Qian Qing,et al."Elemental geochemistry and tectonic significance of Cambrian basalts from the northern side of the Nalati Mountain".ACTA PETROLOGICA SINICA 23.7(2007):1708-1720. |
入库方式： OAI收割
来源：地质与地球物理研究所
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