Fe-Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo-Tethys Subduction Zone

doi:10.1029/2023JB026778

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	Fe-Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo-Tethys Subduction Zone
	Chen, Long 1,5,6,7; Li, Dong-Yong 1,7; Deng, Jiang-Hong 4; Li, San-Zhong 1,5,7; Somerville, Ian 2; Chen, Yi-Xiang 6; Zhao, Zi-Fu 6; An, Wei 3; Li, Xiao-Hui 1,5,7
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2023-09-01
卷号	128 期号:9 页码:23
关键词	crustal recycling subduction zone magmatism Fe and Mg isotopes trench sediments Gangdese arc southern Tibet
ISSN号	2169-9313
DOI	10.1029/2023JB026778
通讯作者	Chen, Long(chenlong@ouc.edu.cn) ; Li, Dong-Yong(lidongyong@ouc.edu.cn) ; Deng, Jiang-Hong(jhdeng0507@163.com)
英文摘要	There has been intense debate on the mechanism of crustal recycling in subduction zones, and Fe-Mg isotopes may provide new constraints on this issue. This study reports Fe-Mg isotope data for mafic plutonic rocks from the eastern and central Gangdese arc, along with their associated trench sediments in southern Tibet. The d(26)Mg values of the eastern Gangdese arc rocks show negative correlations with (Sr-87/Sr-86)(i) and (Pb-206/Pb-204)(i) values, but positive correlations with e(Nd)(t) and e(Hf)(t) values. Conversely, the d(56)Fe values of the eastern Gangdese arc rocks show positive correlations with (Sr-87/Sr-86)(i) and (Pb-206/Pb-204)(i) values, but negative correlations with e(Nd)(t) and e(Hf)(t) values. The Mg and Fe isotopic compositions of the central Gangdese arc rocks are comparable with those of the eastern ones, but they do not correlate with Sr-Pb-Nd-Hf isotopic compositions. Notably, the Fe-Mg isotopic compositions of most arc rocks fall between those of local trench sediments and the mantle wedge. Combined qualitative analyses and quantitative simulations suggest that: (a) the Fe-Mg isotope variations observed in the eastern Gangdese arc rocks highlight the important role of source mixing between sediment-derived melts and peridotite, whereas (b) the Fe-Mg isotope variations observed in the central Gangdese arc rocks reflect the superposition of carbonated serpentinite-derived Mg-rich fluids-peridotite source mixing and source melting. The strong correlations between Fe-Mg isotope ratios and traditional geochemical tracers provide further evidence for the recycling of crustal materials in subduction zones via various types of slab-derived fluids and melts.
资助项目	This study was supported by funds from the National Natural Science Foundation of China (92058211, 92155306, and 42072061), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB41000000), the Shandong Excellent Young Scientist[92155306] ; This study was supported by funds from the National Natural Science Foundation of China (92058211, 92155306, and 42072061), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB41000000), the Shandong Excellent Young Scientist[42072061] ; This study was supported by funds from the National Natural Science Foundation of China (92058211, 92155306, and 42072061), the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (XDB41000000), the Shandong Excellent Young Scientist[XDB41000000] ; National Natural Science Foundation of China[ZR2022YQ32] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[tsqn202306284] ; Shandong Excellent Young Scientist Grant[2023213] ; Taishan Scholar Program of Shandong ; Youth Innovation Promotion Association, Chinese Academy of Sciences ; [92058211]
WOS关键词	CIMA DI GAGNONE ; SLAB ROLL-BACK ; SOUTHERN TIBET ; OCEANIC-CRUST ; GANGDESE BATHOLITH ; ADAKITIC AFFINITIES ; SEDIMENTARY INPUT ; ELEMENT SIGNATURE ; MELANGE DIAPIRS ; OXYGEN FUGACITY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:001056912800001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/182924]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Chen, Long; Li, Dong-Yong; Deng, Jiang-Hong
作者单位	1.Ocean Univ China, MOE, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech, Qingdao 266100, Peoples R China 2.Univ Coll Dublin, UCD Sch Earth Sci, Belfield, Ireland 3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China 5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China 6.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China 7.Ocean Univ China, Coll Marine Geosci, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Chen, Long,Li, Dong-Yong,Deng, Jiang-Hong,et al. Fe-Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo-Tethys Subduction Zone[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(9):23.
APA	Chen, Long.,Li, Dong-Yong.,Deng, Jiang-Hong.,Li, San-Zhong.,Somerville, Ian.,...&Li, Xiao-Hui.(2023).Fe-Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo-Tethys Subduction Zone.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(9),23.
MLA	Chen, Long,et al."Fe-Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo-Tethys Subduction Zone".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.9(2023):23.