| Postcollisional potassic and ultrapotassic rocks in southern Tibet: Mantle and crustal origins in response to India-Asia collision and convergence | |
| Liu, Dong1,2; Zhao, Zhidan1,2; Zhu, Di-Cheng1,2; Niu, Yaoling1,2,3,4; DePaolo, Donald J.5; Harrison, T. Mark6; Mo, Xuanxue1,2; Dong, Guochen1,2; Zhou, Su1,2; Sun, Chenguang7; Zhang, Zhaochong1,2; Liu, Junlai1,2; Zhao, ZD (reprint author), China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China. | |
| 2014-10-15 | |
| 发表期刊 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 卷号 | 143页码:207-231 |
| 文章类型 | Article |
| 摘要 | Postcollisional potassium-rich magmatism in southern Tibet provides an important insight into the deep processes inducing accelerated plateau uplift and associated geologic episodes during early Miocene. As a major outcropping of postcollisional magmatic rocks in the southwestern Tibet, ultrapotassic and potassic volcanism in Xungba basin occurred coevally at similar to 23 Ma, consisting of bimodal-like volcanic sequence. The mantle-derived ultrapotassic rocks (Group 1) are latites and marked by both mantle and crustal geochemical signatures, similar to other younger (19-10 Ma) ultrapotassic rocks elsewhere in the southern Tibet. The high Th/Yb ratios, low Ba/La and Hf/Sm ratios observed in ultrapotassic rocks strongly imply derivation from a metasomatized lithospheric mantle regions enriched by inputs of pelagic sediment and carbonate during previous Tethyan oceanic subduction, while their relatively high SiO2 and Dy/Yb, low Ni/MgO and CaO/Al2O3, and convex upward Sr-87/Sr-86-delta O-18(V-SMOW) relationship suggest additional contributions of overthickened lower crust and ancient basement except for enriched mantle sources. The potassic rocks (Group 2), which underlie Group 1 rocks, are intermediate to silicic and exhibit adakitic geochemical affinities with high Sr/Y and La/Yb ratios, and low Y and Yb concentrations. The fingerprint of overthickened lower crust identified both from ultrapotassic and potassic rocks may be an important feature for magmatism occurred under the background of continental collision. And the bimodal volcanic sequence of Xungba postcollisional magmatism may further corroborate that the removal of lower part of over-thickened lithospheric mantle at depth have triggered an extension setting associated with Miocene plateau uplift. (C) 2014 Elsevier Ltd. All rights reserved. |
| 学科领域 | Geochemistry & Geophysics |
| DOI | 10.1016/j.gca.2014.03.031 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000344072500013 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/23834 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zhao, ZD (reprint author), China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, 29 Xueyuan Rd, Beijing 100083, Peoples R China. |
| 作者单位 | 1.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China 2.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 5.Univ Calif Berkeley, Ctr Isotope Geochem, Berkeley, CA 94720 USA 6.Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90095 USA 7.Brown Univ, Dept Geol Sci, Providence, RI 02912 USA |
| 推荐引用方式 GB/T 7714 | Liu, Dong,Zhao, Zhidan,Zhu, Di-Cheng,et al. Postcollisional potassic and ultrapotassic rocks in southern Tibet: Mantle and crustal origins in response to India-Asia collision and convergence[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2014,143:207-231. |
| APA | Liu, Dong.,Zhao, Zhidan.,Zhu, Di-Cheng.,Niu, Yaoling.,DePaolo, Donald J..,...&Zhao, ZD .(2014).Postcollisional potassic and ultrapotassic rocks in southern Tibet: Mantle and crustal origins in response to India-Asia collision and convergence.GEOCHIMICA ET COSMOCHIMICA ACTA,143,207-231. |
| MLA | Liu, Dong,et al."Postcollisional potassic and ultrapotassic rocks in southern Tibet: Mantle and crustal origins in response to India-Asia collision and convergence".GEOCHIMICA ET COSMOCHIMICA ACTA 143(2014):207-231. |
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