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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

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Science China Earth Sciences 2024年第9期67卷 2824-2844页

作者： Hongyu WANG Shuanhong ZHANG Sen WANG Linghao KONG Yue ZHAO Qiqi ZHANG Sen GAO Guohui HU Institute of Geomechanics Chinese Academy of Geological SciencesBeijing 100081China Key Laboratory of Paleomagnetism and Tectonic Reconstruction Ministry of Natural ResourcesBeijing 100081China SinoProbe Laboratory Chinese Academy of Geological SciencesBeijing 100037China School of Earth Science and Mineral Resources China University of GeosciencesBeijing 100083China

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 *** 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(δ^(13)C_(V-PDB)>10‰)*** event has attracted the attention of scholars all over the ***,except for a high positive carbon isotope excursion(δ^(13)C_(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(δ^(13)C_(V-PDB)liaohe group carbonate rocks from the Anshan area in the northwestern margin of the Jiao-Liao-Ji Belt in the northeast *** results show that the Gaojiayu Formation of the liaohe group in the Anshan area has high positive δ^(13)C_(V-PDB) values from 8.6‰ to 12.4‰ and δ^(18)O_(V-SMOW) values of 17.9‰-27.4‰(δ^(18)O_(V-PDB) values ranging from−12.6‰to -3.4‰).This provides solid evidence for the preservation of reliable sedimentary records of the LJE in the northeastern *** of the high positive δ^(13)C excursion(>10‰)of marine carbonate rocks occurred at about 2.15 *** co

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

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Chemical indexes of Paleoproterozoic sedimentary rocks from liaohe group,North China Craton:Implications for paleoclimate and provenance

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Global Geology 2021年第2期24卷 71-79页

作者： ZHANG Wei LI Zhuang YANG Fan PEI Fuping LIU Jin WANG Junhui WANG Zhiwei College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061China Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Regional Geology and Mineralization Hebei GEO UniversityShijiazhuang 050031China

Paleoproterozoic supracrustal materials have been widely identified in North China Craton,such as the liaohe-,Hutuo-and Lyuliang *** liaohe group in the eastern part of the North China Craton is dominated by deformed and metamorphosed sedimentary and volcanic *** with that of the coeval volcanic rocks,geochemistry of the sedimentary rocks from the liaohe group has rarely been studied in detail,which can possibly provide information on the paleoclimate and *** authors analyzed the whole-rock and detrital zircon geochemistry of sedimentary rocks from the liaohe group against a uniform process and proposed their different ways of paleoweathering of the lower and upper *** is to say,although the lower and upper formations within the liaohe group might be derived from the similar source composition in a tectonically active setting,the paleoclimate that they experienced was not exactly the *** predominant derivations are the Paleoproterozoic granitoids and basalts within the liaohe group,with minor input of Archean continental *** study highlights the contributions of the Paleoproterozoic mafic sources,which has been generally overlooked in the previous researches.

关键词： liaohe group Paleoproterozoic chemical index paleoclimate provenance

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Discovery of Late Permian Jianshanzi volcanic rocks in Qinghe valley of northern Liaoning and its geologic significance

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Global Geology 2008年第3期11卷 145-149页

作者： Yuejun CHEN Chunlin SUN Yuewu SUN Research Center of Palaeontology ＆ Stratigraphy Jilin University Changchun 130026 China

Jianshanzi volcanic rocks at Qinghe valley in the northern Liaoning were considered belonging to Early Proterozoie Gaojiayu Formation of liaohe group, or to Early Cambrian Beidagou Formation of Qinghezhen group, or Middle-Late Proterozoic Shenjiapu Formation-Complex of Kaiyuan group-complex. Dating the zircons from the dacite with schistosity is 2 506 Ma in method of U-Pb （SHRIMP）. This evidence indicates the rocks may be referred to Late Permian in age. Discovery of the rocks is significant to re-recognize stratigraphic property of ＂liaohe group＂, regional geoteetonie location and revolution of orogenic zone in Qinghe valley of the northern Liaoning.

关键词： Jianshanzi volcanic rocks liaohe group Qinghe valley northern Liaoning

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PbSL dating of garnet and staurolite:Constraints on the Paleoproterozoic crustal evolution of the Eastern Block,North China Craton

PbSL dating of garnet and staurolite:Constraints on the Pale...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of Technology

It is well accepted that the North China Craton formed by assembly of the Eastern and Western blocks along the Trans-North China Orogen,with cratonization in the Paleoproterozoic(～1.85 Ma).However, there is controversy about the formation of the Eastern and Western blocks themselves,especially the timing of cratonization of the Eastern *** Jiao-Liao-Ji orogenic belt is the most important Paleoproterozoic Orogenic belt in the Eastern Block and consists mainly of the North and South liaohe groups and the Liaoji *** timing of metamorphism of the liaohe group is the key to understanding the evolution of the Eastern Block of the North China *** the isotope systematics of metamorphic minerals can be used to date parts of the prograde thermal histories of metamorphic belts,dating of minerals, such as garnet and staurolite has the distinct advantage that time information can be related directly to the pressure-temperature-deformation history recorded by the same *** this paper we present results of precise Pb/Pb stepwise-leaching(PbSL) dating of garnet and staurolite from the metasedimentary rocks of the south liaohe *** primitive Pb and radiogenic Pb are selectively extracted from garnet and straurolite by leach steps and determined by multiple collector(MC-) 1CP-MS. The garnet and staurolite record two groups of Pb/Pb ages,at 1.93-1.91 Ga and～1.86 Ga,respectively. These constrain the time of peak metamorphism of the liaohe group during collision between the Longgang Block in the north and the Liaonan(Nangrim) Block in the south and a subsequent post-col-lisional event,*** data for the South liaohe group and previously published data for the Liaoji Granite,combined with key lithological,structural and metamorphic information,indicate that the cratonization of the Eastern Block of the North China Craton occurred at 1.93-1.91 Ga.

关键词： Eastern Block North China Craton liaohe group Jiao-Liao-Ji belt Pb step-leaching dating Garnet Staurolite

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