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Large Mg-Fe isotope fractionation in volcanic rocks from northeast China: The role of chemical weathering and magma compositional effect

文献类型：期刊论文

作者Wei, Haiquan1; Tian, Heng-Ci6; Li, Shu-Guang5; Yang, Wei6; Gao, Bing-Yu3,4; Ke, Shan5; Li, Rui-Ying6; Chen, Xiaowen2; Yu, Hongmei1
刊名CHEMICAL GEOLOGY
出版日期2021-03-30
卷号565页码:10
关键词Mg-Fe isotopes Paleo-weathering event Changbaishan Tianchi volcano Fractional crystallization Open magmatic system
ISSN号0009-2541
DOI10.1016/j.chemgeo.2021.120075
英文摘要This study presents Mg and Fe isotopic data for a suite of volcanic rocks including basalt, trachyte and comendite from Changbaishan, northeast China. Our results show that the Millennium Eruption (ME) trachytes and comendites have delta Mg-26 ranging from 0.37 to 0.14%. Combined with literature data, the positive correlation between delta Mg-26 and 87Sr/86Sr ratios and the almost constant value for Nd isotopes suggest that the heavy Mg isotopic composition most likely derived from involvement of weathered products of basalt instead of the old supracrustal/basement rocks. Iron isotopic composition is significantly varied throughout our suite of samples, with delta Fe-56 values of 0.17 +/- 0.04% and 0.16 +/- 0.03% for basalts, 0.09 to 0.23% for cone-construction trachytes, and 0.23 to 0.37% for the ME samples. The slightly higher delta Fe-56 than MORB observed in basalts reflect the role of subducted materials that could elevate source Fe3+/SFe ratios via redox reaction. The trachytes from the cone construction, thought to be significantly affected by chemical weathered product, have a restricted Fe isotopic variation, while those ME samples with less weathered product input have overall higher delta Fe-56 values. This contrasting Fe isotopic signature suggests that the paleo-weathering event likely occurred under oxidized environment, leaving the residue with little Fe isotope fractionation. By contrast, the good correlations between Fe isotopes and indicators of magmatic differentiation (e.g., tFe(2)O(3), SiO2, Mg#) in all rocks reflect that fractional crystallization under an open system most likely accounts for the Fe isotopic variation, which was enhanced by the compositional effect as suggested by the broadly positive relationship between delta Fe-56 and (Na + K)/ (Ca + Mg). This study therefore highlights the potential applications of Mg-Fe isotopes as great tracers of redox condition and ancient climate.
资助项目National Natural Science Foundation of China[41730214] ; National Natural Science Foundation of China[41861144025] ; National Postdoctoral Program[2018M631566] ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration[IGCEA1603]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000627419100007
出版者ELSEVIER
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 ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; National Postdoctoral Program ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration ; Fundamental Scientific Research Projects of Institute of Geology, China Earthquake Administration
源URL[http://ir.iggcas.ac.cn/handle/132A11/101016]  
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
地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Tian, Heng-Ci
作者单位1.China Earthquake Adm CEA, Inst Geol, Jilin Changbaishan Volcano Natl Observat & Res St, Beijing 100029, Peoples R China
2.Geol Museum China, Beijing 100034, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wei, Haiquan,Tian, Heng-Ci,Li, Shu-Guang,et al. Large Mg-Fe isotope fractionation in volcanic rocks from northeast China: The role of chemical weathering and magma compositional effect[J]. CHEMICAL GEOLOGY,2021,565:10.
APA Wei, Haiquan.,Tian, Heng-Ci.,Li, Shu-Guang.,Yang, Wei.,Gao, Bing-Yu.,...&Yu, Hongmei.(2021).Large Mg-Fe isotope fractionation in volcanic rocks from northeast China: The role of chemical weathering and magma compositional effect.CHEMICAL GEOLOGY,565,10.
MLA Wei, Haiquan,et al."Large Mg-Fe isotope fractionation in volcanic rocks from northeast China: The role of chemical weathering and magma compositional effect".CHEMICAL GEOLOGY 565(2021):10.

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来源：地质与地球物理研究所

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