成果归属作者：

王宏语

成果归属机构：

地球科学与资源学院

作者：

Hongyu WANG ;Shuanhong ZHANG ;Sen WANG ;Linghao KONG ;Yue ZHAO ;Qiqi ZHANG ;Sen GAO ;Guohui HU

单位：

Institute of Geomechanics, Chinese Academy of Geological Sciences;Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources;SinoProbe Laboratory, Chinese Academy of Geological Sciences;School of Earth Science and Mineral Resources, China University of Geosciences

英文关键词：

Lomagundi-Jatuli Event(LJE);Great Oxidation Event(GOE);Carbon-oxygen isotopes;Liaohe Group;Marine carbonate;Jiao-Liao-Ji Belt;North China Craton

摘要：

The Great Oxidation Event(GOE) during the early Paleoproterozoic represents the first significant buildup in Earth's atmospheric oxygen and resulted in a series of significant changes in the Earth's surface environment. Among them is the 2.22(or 2.33)–2.06 Ga Lomagundi-Jatuli Event(LJE), which is globally, the largest magnitude and longest duration, marine carbonate positive carbon isotope excursion(δ¹³C_V-PDB>10‰) known. This event has attracted the attention of scholars all over the world. However, except for a high positive carbon isotope excursion(δ¹³C_V-PDB>10‰) recently identified from marine carbonate rocks within the Daposhan Formation in the lower Fanhe Group(or the Sanchazi Group) in the Longgang Block in the northeast North China Craton(NCC), Paleoproterozoic carbonates in the NCC are characterized by a low-amplitude positive carbon isotope excursion(δ¹³C_V-PDB10‰) of marine carbonate rocks occurred at about 2.15 Ga.Lithological comparisons of different sections and whole-rock geochemical results show that the high positive δ¹³C excursion is mainly controlled by the stratigraphic interval and depositional ages; the changes of sedimentary facies and diagenesis have no significant effects on reducing of the δ¹³C values. The intrusion of mafic sills into carbonates has resulted in synchronous decrease of C-O isotopes near the contact zones, but the decreasing amplitude of δ¹³C is less than 3‰. Therefore, our study firstly identified marine carbonates with high positive δ¹³C excursion(>10‰) from the Gaojiayu Formation, which provides robust evidence for global correlation of the LJE, which has implications for its genesis and global significance. Moreover, due to global near-synchronization of the LJE, the carbon-oxygen isotope chemical stratigraphy of carbonate rocks deposited during the LJE period, combined with geochronological data, can provide new constraints on the stratigraphic subdivision and correlations of Paleoproterozoic sedimentary successions in the NCC.

基金：

financially supported by the National Natural Science Foundation of China (Grant Nos. 41920104004, U2244213, 41725011);the Fundamental Research Fund of Chinese Academy of Geological Sciences (Grant No. JKYZD202320)

语种：

英文

来源：

Science China Earth Sciences,2024(09):2824-2844.

中图分类号：

P534.3;P597

出版日期：

2024-07-31

提交日期：

2024-08-23

引用参考：

Hongyu WANG;Shuanhong ZHANG;Sen WANG;Linghao KONG;Yue ZHAO;Qiqi ZHANG;Sen GAO;Guohui HU. Identification of carbonates with high positive carbon isotope excursion from the Liaohe Group in the northeastern North China Craton and implications for the Lomagundi-Jatuli Event[J]. Science China Earth Sciences,2024(09):2824-2844.