Geochemistry and SHRIMP zircon U-Pb age of diabases in the Lajishankou ophiolitic melange, South Qilian terrane.
文献类型：期刊论文
| 作者 | Fu ChangLei1; Yan Zhen1; Guo XianQing2; Niu ManLan3; Xia WenJing3; Wang ZongQi2; Li JiLiang4 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2014-06-01 |
| 卷号 | 30期号:6页码:1695-1706 |
| ISSN号 | 1000-0569 |
| 关键词 | Diabase Ocean island/Seamount Mid-ocean ridge Ophiolitic melange Lajishan Mountain |
| 文献子类 | Article |
| 英文摘要 | The Lajishankou ophiolitic melange, which is an important ingredient of the ophiolitic m lange between the Central and the South Qilian terranes, contains varities of Ethological units showing tectonic relationship between them. Diabases in this m lange occur as blocks and dykes respectively. The formers have SiO2, contents of 49. 80% similar to 50. 13%, MgO contents of 5.43% similar to 5. 64%, FeOT contents of 10. 96% similar to 11. 52% and relatively higher TiO2 contents of 2. 38% similar to 2. 62%; the laters have SiO2 contents of 43. 41% similar to 45. 74%, MgO contents of 9. 04% similar to 10. 64%, FeOT contents of 8.39% 9. 96% and low TiO, contents of 0. 89% similar to 1. 02%. They belong to tholeiitic rocks. The diabase blocks have high total REE contents ( 135. 4 x 10(-6) similar to 150. 9 x 10 (-6)) and ( La/Yb), ratios (3. 51 similar to 4. 03) with right-inclined REE patterns and enrichment in large ion lithophile elements ( including Rb, Ba, K, Sr) and high field strength elements ( including Th, Nb, Ta, Zr,, Hf, Ti), showing typical features of OIB. However, the diabase dykes have low total REE contents (36. 10 x 10(-6) similar to 43.72 x 10(-6)) and ( La/Yb), ratios ( 1. 12 similar to 1. 20) and flat REE patterns, indicating similar character of MORB. In addition, diabase blocks and dykes are lack of negative Nb, Ta and Ti anomalies. SHRIMP zircon U-Pb dating of diabase block yields a weighted mean Pb-206/U-238 age of 491. +/- 0 5. 1Ma, representing the age of crystallization. These characters suggest that the mafic diabases in the Lajishankou ophiolitic m lange were probably formed in ocean island/seamount and mid-ocean ridge environments, which were mixed with other lithological units during the northward subduction-accretion of the Proto-Tethys Ocean. |
| WOS关键词 | TECTONIC IMPLICATIONS ; OCEANIC-CRUST ; ORIGIN ; CLASSIFICATION ; EMPLACEMENT ; ELEMENTS ; DIAGRAM ; BASALTS ; SERIES ; ZR |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000338487400012 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/85761]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Fu ChangLei |
| 作者单位 | 1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 2.Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China 3.Hefei Univ Technol, Dept Resources & Environm, Hefei 230009, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fu ChangLei,Yan Zhen,Guo XianQing,et al. Geochemistry and SHRIMP zircon U-Pb age of diabases in the Lajishankou ophiolitic melange, South Qilian terrane.[J]. ACTA PETROLOGICA SINICA,2014,30(6):1695-1706. |
| APA | Fu ChangLei.,Yan Zhen.,Guo XianQing.,Niu ManLan.,Xia WenJing.,...&Li JiLiang.(2014).Geochemistry and SHRIMP zircon U-Pb age of diabases in the Lajishankou ophiolitic melange, South Qilian terrane..ACTA PETROLOGICA SINICA,30(6),1695-1706. |
| MLA | Fu ChangLei,et al."Geochemistry and SHRIMP zircon U-Pb age of diabases in the Lajishankou ophiolitic melange, South Qilian terrane.".ACTA PETROLOGICA SINICA 30.6(2014):1695-1706. |
入库方式： OAI收割
来源：地质与地球物理研究所
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