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Carbon and oxygen isotope geochemistry of marbles in the Jingshan Group, Jiaobei Terrane and its indication to the Lomagundi-Jatuli Event
Li KaiYue; Tang HaoShu1; Chen YanJing; Xue LiZhi; Wang Pin2; Sun ZhiFu3
2020
Source PublicationACTA PETROLOGICA SINICA
ISSN2095-8927
Volume36Issue:4Pages:1059
AbstractThe rapid rise of atmospheric oxygen content in Paleoproterozoic (i.e., Great Oxidation Event) resulted in many dramatic changes in earth's surficial system, including the 2.3 similar to 2.06Ma positive delta C-13(carb) excursion, termed Lomagundi-Jatuli Event, which has been a focus of international geological and geochemical studies. The Lugezhuang Formation, lower portion of the Jingshan Group, is a high amphibolite to granulite facies metamorphic carbonate association. Herewith we report the results obtained from isotope and element geochemical study of 26 marble and 7 dolomitic quartzite samples from the Lugzhuang Formation at Shanhou village. The delta C-13(carb) values of the samples range from -0.8 parts per thousand to +3.4 parts per thousand (V-PDB), with an average of +1.4 parts per thousand. The delta C-13(carb) averages of marbles and dolomitic quartzites are +1.6 parts per thousand and +0.9 parts per thousand, respectively. The delta O-18(carb) values range from 9.3 parts per thousand to 20.2 parts per thousand (V-SMOW), with an average of 14.0 parts per thousand. The delta O-18(carb) and delta C-13(carb) values positively correlate, and 13 samples show Mn/Sr ratios of >6. This indicates that the delta C-13(carb) values of carbonates have been intensely modified by metamorphism, possibly causing a decrease of delta C-13(carb) values by 3 parts per thousand to 5 parts per thousand. Hence, the delta C-13(carb) values originally sedimentary carbonates are possibly up to +8.4 parts per thousand, showing positive delta C-13(carb) excursion characterizing the global Lomagundi-Jatuli Event.
DepartmentOMG
KeywordLomagundi-Jatuli Event Great Oxidation Event delta C-13(carb) anomaly Lugezhuang Formation of Jingshan Group Jiaobei Terrain
DOI10.18654/1000-0569/2020.04.06
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Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/18589
Collection中科院边缘海地质重点实验室
Affiliation1.Peking Univ, MOE Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550008, Peoples R China
3.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
4.Shandong Gold Grp Co Ltd, Laizhou 261442, Peoples R China
Recommended Citation
GB/T 7714
Li KaiYue,Tang HaoShu,Chen YanJing,et al. Carbon and oxygen isotope geochemistry of marbles in the Jingshan Group, Jiaobei Terrane and its indication to the Lomagundi-Jatuli Event[J]. ACTA PETROLOGICA SINICA,2020,36(4):1059, 1075.
APA Li KaiYue,Tang HaoShu,Chen YanJing,Xue LiZhi,Wang Pin,&Sun ZhiFu.(2020).Carbon and oxygen isotope geochemistry of marbles in the Jingshan Group, Jiaobei Terrane and its indication to the Lomagundi-Jatuli Event.ACTA PETROLOGICA SINICA,36(4),1059.
MLA Li KaiYue,et al."Carbon and oxygen isotope geochemistry of marbles in the Jingshan Group, Jiaobei Terrane and its indication to the Lomagundi-Jatuli Event".ACTA PETROLOGICA SINICA 36.4(2020):1059.
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