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Magnesium and Lithium Isotopic Evidence for a Remnant Oceanic Slab Beneath Central Tibet

文献类型：期刊论文

作者Tian, Heng-Ci1,5,6; Teng, Fang-Zhen5; Hou, Zeng-Qian4; Tian, Shi-Hong2,3,5; Yang, Wei1,6; Chen, Xin-Yang5; Song, Yu-Cai4
刊名JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
出版日期2020
卷号125期号:1页码:15
关键词Sr-Nd-Mg-Li isotopes fluid and melt metasomatism Eocene volcanic rocks Qiangtang uplift remnant oceanic slab
ISSN号2169-9313
DOI10.1029/2019JB018197
英文摘要The voluminous Eocene postcollisional potassium-rich magmatism in central Tibet is crucial in understanding the deep geodynamic process and related uplift history of the Tibetan Plateau. Here, we present an integrated study of whole-rock Sr-Nd-Mg-Li isotopes and zircon U-Pb ages on two suites of lavas from Duocaima and Nariniya in the northern Qiangtang block. The Duocaima high-K calc-alkaline trachyandesites were formed at 35 Ma and are enriched in light rare earth elements and large ion lithophile elements. They have slightly lower delta Mg-26 (-0.41 to -0.33) and delta Li-7 (+1.0 to +2.6) relative to the mantle. Together with their high Sr-87/Sr-86((i)) (0.7066-0.7067) and low (Nd)(t) (-1.96 to -1.61) values, they most likely originated from the lithospheric mantle previously metasomatized by melts from subducted carbonate-bearing sediments. Model calculation suggests that 7-11% sediments were added into the mantle via melting. By contrast, the contemporaneous Nariniya adakitic trachytes have higher delta Mg-26 (-0.13 parts per thousand to -0.02 parts per thousand) and delta Li-7 (+3.3 parts per thousand to +5.4 parts per thousand) values, as well as higher Pb/Ce and Ba/La ratios, which most likely resulted from the thickened lower crust that was metasomatized by fluids released from downgoing Songpan-Ganzi oceanic slab. Our combined isotopic study suggests the existence of a remnant oceanic slab beneath central Tibetan Plateau during the late Eocene and implies that the initial uplift of central Tibet was before 38 Ma.
WOS关键词SUBDUCTED CONTINENTAL-CRUST ; DEEP CARBON-CYCLE ; QIANGTANG TERRANE ; VOLCANIC-ROCKS ; NORTHERN TIBET ; LUNPOLA BASIN ; U-PB ; LITHOSPHERIC MANTLE ; ADAKITIC ROCKS ; EOCENE
资助项目National Natural Science Foundation of China[41773014] ; National Natural Science Foundation of China[41729001] ; National Natural Science Foundation of China[41320104004] ; National Natural Science Foundation of China[41373014] ; China Scholarship Council[201708110007] ; China Scholarship Council[201804910290] ; Chinese Academy of Geological Sciences[YYWF201606]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000530895100027
出版者AMER GEOPHYSICAL UNION
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; China Scholarship Council ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences ; Chinese Academy of Geological Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/96735]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Tian, Heng-Ci; Tian, Shi-Hong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Chinese Acad Geol Sci, Inst Mineral Resources, MNR Key Lab Metallogeny & Mineral Assessment, Beijing, Peoples R China
3.East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang, Jiangxi, Peoples R China
4.Chinese Acad Geol Sci, Inst Geol, Beijing, Peoples R China
5.Univ Washington, Isotope Lab, Dept Earth & Space Sci, Seattle, WA 98195 USA
6.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Tian, Heng-Ci,Teng, Fang-Zhen,Hou, Zeng-Qian,et al. Magnesium and Lithium Isotopic Evidence for a Remnant Oceanic Slab Beneath Central Tibet[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2020,125(1):15.
APA Tian, Heng-Ci.,Teng, Fang-Zhen.,Hou, Zeng-Qian.,Tian, Shi-Hong.,Yang, Wei.,...&Song, Yu-Cai.(2020).Magnesium and Lithium Isotopic Evidence for a Remnant Oceanic Slab Beneath Central Tibet.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,125(1),15.
MLA Tian, Heng-Ci,et al."Magnesium and Lithium Isotopic Evidence for a Remnant Oceanic Slab Beneath Central Tibet".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 125.1(2020):15.

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来源：地质与地球物理研究所

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