成果归属作者：

李曙光

作者：

Dong, Xu-Han ; Wang, Shui-Jiong ; Wang, Wenzhong ; Huang, Shichun ; Li, Qiu-Li ; Liu, Chengshuai ; Gao, Ting ; Li, Shuguang ; Wu, Shitou

单位：

China Univ Geosci Beijing, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China;China Univ Geosci Beijing, Frontiers Sci Ctr Deep Time Digital Earth, Beijing 100083, Peoples R China;Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China;USTC, CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China;USTC, Natl Geophys Observ Mengcheng, Mengcheng, Peoples R China;Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA;Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China;Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China

关键词：

ZINC ISOTOPE EVIDENCE; BIG MANTLE WEDGE; OXIDATION-STATE; MAGMATIC DIFFERENTIATION; CENOZOIC BASALTS; SHANDONG PROVINCE; EASTERN CHINA; OCEANIC-CRUST; MG; IRON

摘要：

Deep carbon cycle is crucial for mantle dynamics and maintaining Earth's habitability. Recycled carbonates are a strong oxidant in mantle carbon-iron redox reactions, leading to the formation of highly oxidized mantle domains and deep carbon storage. Here we report high Fe3+/& sum;Fe values in Cenozoic intraplate basalts from eastern China, which are correlated with geochemical and isotopic compositions that point to a common role of carbonated melt with recycled carbonate signatures. We propose that the source of these highly oxidized basalts has been oxidized by carbonated melts derived from the stagnant subducted slab in the mantle transition zone. Diamonds formed during the carbon-iron redox reaction were separated from the melt due to density differences. This would leave a large amount of carbon (about four times of preindustrial atmospheric carbon budget) stored in the deep mantle and isolated from global carbon cycle. As such, the amounts of subducted slabs stagnated at mantle transition zone can be an important factor regulating the climate.

基金：

National Key R&D Program of China [2022YFF0801004]; National Nature Science Foundation of China [41973010]; National Key R&D Program of China [2019YFA0708404]; Fundamental Research Funds for the Central Universities [2652023001, WK2080000189]; NSF [EAR- 2244895]; National Natural Science Foundation of China [42025705]

语种：

英文

DOI：

10.1126/sciadv.adm8138

来源：

SCIENCE ADVANCES,2024(32):.

出版日期：

2024-08-07

提交日期：

2024-08-21

引用参考：

Dong, Xu-Han; Wang, Shui-Jiong; Wang, Wenzhong; Huang, Shichun; Li, Qiu-Li; Liu, Chengshuai; Gao, Ting; Li, Shuguang; Wu, Shitou. Highly oxidized intraplate basalts and deep carbon storage[J]. SCIENCE ADVANCES,2024(32):.