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Subducted Mg-rich carbonates into the deep mantle wedge
Shen, Ji1; Li, Shu-Guang1,2; Wang, Shui-Jiong2; Teng, Fang-Zhen3; Li, Qiu-Li4; Liu, Yong-Sheng5
2018-12-01
发表期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
卷号503页码:118-130
摘要Recent studies have concluded that subducted calcium (Ca-) rich carbonates could be dissolved in slab derived aqueous fluids and transported upwards into the shallow mantle wedge (75-120 km), while magnesium (Mg-) rich carbonates could be delivered to a greater depth (i.e., the mantle transition zone, similar to 410 km), melted, and recycled into the convective upper mantle. However, it remains unknown whether or not Mg-rich carbonates can be transferred to the deep mantle wedge (>similar to 120 km) by subduction-zone fluids, which, if true, is important for tracing deep carbon. In this paper, we report a comprehensive mineralogical, geochemical, stable (Mg and O) and radiogenic isotopic (zircon U-Pb) study of garnet clinopyroxenites from the Maowu ultra-mafic massif (a slice of the mantle wedge) in the Dabie orogeny, Central China. Whole-rock and mineral trace elemental features and zircon U-Pb ages reveal evidence of mantle wedge metasomatism by a slab-derived melt or supercritical fluid from the subducted rutile-bearing eclogitic Paleo-Tethys oceanic crust, in addition to subsequent metamorphism occurring during the Triassic collision between the South and North China blocks. Combined with the results of previous works, the high Th/U ratios of both whole rocks and metasomatized zircons with no oscillatory zoning lead us to infer that a supercritical liquid rather than a melt was the metasomatic agent during oceanic subduction at peak conditions (5.3-6.3 GPa and similar to 800 degrees C, 160-190 km). Abundant carbonate mineral inclusions (including calcite, dolomite and magnesite) and the high delta O-18(VSMOW) values of the metasomatized zircons (up to 12.2 parts per thousand) indicate that sedimentary carbonates were leached by the supercritical fluid. Furthermore, whole-rock delta Mg-26 values (-0.99 parts per thousand to -0.65 parts per thousand) that are lower than normal mantle values (-0.25 +/- 0.07 parts per thousand) imply that the incorporated carbonates contain not only calcites but also a certain amount of dolomites (approximately 1-10 wt.% of the metasomatic supercritical liquid). The dissolved Mg-rich carbonates in the slab-derived supercritical liquid could effectively modify the Mg isotope composition of the deep mantle wedge. Our study represents a critical step towards achieving a broad understanding of the behaviours of recycled carbonate during slab subduction. (C) 2018 Elsevier B.V. All rights reserved.
关键词subducted carbonates mantle wedge metasomatism Mg isotope O isotope supercritical liquid
DOI10.1016/j.epsl.2018.09.011
资助者National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science
关键词[WOS]MAGNESIUM ISOTOPIC HETEROGENEITY ; TRACE-ELEMENT SIGNATURE ; ZIRCON U-PB ; EASTERN CHINA ; SILICATE MELTS ; NORTH CHINA ; CONTINENTAL SUBDUCTION ; PYROXENITE XENOLITHS ; THERMAL-DIFFUSION ; OXYGEN ISOTOPES
语种英语
资助项目National Key R&D Program of China[2016YFC0600404] ; Chinese Ministry of Science and Technology[2015CB856102] ; National Science Foundation[41730214] ; National Science Foundation[41230209] ; National Science Foundation[41090372] ; National Science Foundation[EAR-1340160] ; National Natural Science Foundation of China[41403001] ; National Natural Science Foundation of China[41673006] ; Chinese Academy of Science[XDPB11]
资助者National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science ; National Key R&D Program of China ; National Key R&D Program of China ; Chinese Ministry of Science and Technology ; Chinese Ministry of Science and Technology ; National Science Foundation ; National Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Science ; Chinese Academy of Science
WOS研究方向Geochemistry & Geophysics
WOS类目Geochemistry & Geophysics
WOS记录号WOS:000449246100013
出版者ELSEVIER SCIENCE BV
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89434
专题岩石圈演化国家重点实验室
通讯作者Shen, Ji; Li, Shu-Guang
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China
2.Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
3.Univ Washington, Dept Earth & Space Sci, Isotope Lab, Seattle, WA 98195 USA
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
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Shen, Ji,Li, Shu-Guang,Wang, Shui-Jiong,et al. Subducted Mg-rich carbonates into the deep mantle wedge[J]. EARTH AND PLANETARY SCIENCE LETTERS,2018,503:118-130.
APA Shen, Ji,Li, Shu-Guang,Wang, Shui-Jiong,Teng, Fang-Zhen,Li, Qiu-Li,&Liu, Yong-Sheng.(2018).Subducted Mg-rich carbonates into the deep mantle wedge.EARTH AND PLANETARY SCIENCE LETTERS,503,118-130.
MLA Shen, Ji,et al."Subducted Mg-rich carbonates into the deep mantle wedge".EARTH AND PLANETARY SCIENCE LETTERS 503(2018):118-130.
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