A back-arc extensional environment of the Early Carboniferous Paleo-Tethys Ocean in Tibetan Plateau: Evidences from A-type granites.
文献类型：期刊论文
| 作者 | Hu PeiYuan1; Li Cai2; Wu YanWang2; Xie ChaoMing2; Wang Ming2; Li Jiao3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2016-04-01 |
| 卷号 | 32期号:4页码:1219-1231 |
| 关键词 | Tibetan Plateau Qiangtang Paleo-tethys Ocean A-type Granite Zircon U-pb Dating |
| 文献子类 | Article |
| 英文摘要 | This paper reports new zircon U-Pb age and Hf-isotope, and whole -rock major and trace element data from K-feldspar granites located in Gangmacuo area of Longmu Co-Shuanghu-Lancang River suture zone, central Qiangtang, northern Tibetan Plateau. Combined with high Th/U ratios (0.58 - 1.05), the zircons from K-feldspar granites show no euhedral crystals and have clear oscillatory zones, indicating a magmatic origin. Zircon LA-ICP-MS dating for K -feldspar granites yields a weighted mean age of 352. 4 +/- 2.4Mo, suggesting that the crystallization age of Gangmacuo K -feldspar granites is Early Carboniferous. Petrological and geochemical study show that the intrusion is characterized by high silicon (SiO2 = 74. 17% - 77. 88%) and low aluminum (Al2O3 = 10. - 50% 11. 98%), depleted magnesium (Mg0 = 0.23% - 0. 36%) and abundant alkali (Na2O + K20 = 5.74% - 7.24%, Na2O > 1(20, K2O/Na2O =0. 53 - 0. 71, A/CNK =0. 87 - 1. 06). Enrichment of Zr, Hf, Rb, Th, U and REE, depletion of Sr, Eu, P and Ti with high 10000Ga/A1 (3. 12 -4. 14), indicate that the K -feldspar granites are aluminous A -type granite and further classified to A(2) type. Their zircons have positive ein. (t) values (+4.40 - + 12.14) and old second stage Hf mode ages (t(DM2) =549-981Ma), indicating that they were generated by mixing of crust and mantle. Gangmacuo K -feldspar granites were formed in a back -arc extensional environment of an active continental margin which was resulted from the subduction of Paleo-Tethys Plate beneath the Qiangbei-Qamdo plate. |
| WOS关键词 | HF ISOTOPIC CHARACTERISTICS ; U-PB AGES ; NORTHERN TIBET ; TECTONIC IMPLICATIONS ; QIANGTANG AREA ; TRACE-ELEMENT ; LU-HF ; DISCRIMINATION DIAGRAMS ; GEOLOGICAL SIGNIFICANCE ; ZIRCON |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000375359200020 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53483]  |
| 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.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 2.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu PeiYuan,Li Cai,Wu YanWang,et al. A back-arc extensional environment of the Early Carboniferous Paleo-Tethys Ocean in Tibetan Plateau: Evidences from A-type granites.[J]. ACTA PETROLOGICA SINICA,2016,32(4):1219-1231. |
| APA | Hu PeiYuan,Li Cai,Wu YanWang,Xie ChaoMing,Wang Ming,&Li Jiao.(2016).A back-arc extensional environment of the Early Carboniferous Paleo-Tethys Ocean in Tibetan Plateau: Evidences from A-type granites..ACTA PETROLOGICA SINICA,32(4),1219-1231. |
| MLA | Hu PeiYuan,et al."A back-arc extensional environment of the Early Carboniferous Paleo-Tethys Ocean in Tibetan Plateau: Evidences from A-type granites.".ACTA PETROLOGICA SINICA 32.4(2016):1219-1231. |
入库方式： OAI收割
来源：地质与地球物理研究所
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