Evidence of the latest Paleoproterozoic (~1615 Ma) mafic magmatism the southern Siberia: Extensional environments in Nuna supercontinent

Гладкочуб, Д.П.; Donskaya, T. V.; Pisarevsky, Sergei A.; Сальникова, Е. Б.; Мазукабзов, А. М.; Kotov, A. B.; Motova, Z.L.; Stepanova, A. V.; Ковач, В. П.

doi:10.1016/j.precamres.2020.106049

Cited by 9 publications

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“…In some recent paleocontinental reconstruction models, the Yangtze block was placed close to the northwestern Laurentia in the Nuna supercontinent based on the correlation of the Mesoproterozoic rocks from southwestern SYB and northwestern Laurentia (Cawood et al., 2018, 2020; Gladkochub et al., 2021; W. Wang et al., 2016). In other models, however, the Cathaysia block has been placed close to western Laurentia in the Nuna supercontinent based on the similarities of Mesoproterozoic magmatic events (∼1,460–1,430 Ma) and metamorphic records (∼1,300–1,000 Ma) in the Hainan terrane and southwestern Laurentia, and the provenance analyses of the Precambrian strata in south China (e.g., Z. X. Li et al., 1995, 2008; Y. J. Xu et al., 2020; S. H. Zhang et al., 2012), although the debate that whether the Mesoproterozoic Hainan terrane was part of the Cathaysia block or the SYB still stands (Cawood et al., 2020; Y. J. Xu et al., 2020).…”

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New Paleomagnetic Results From the Late Mesoproterozoic Luanshigou Formation, Shennongjia Group in South China and Their Implications for the Pre‐Grenvillian Connections Between South China Blocks and Southwestern Laurentia

Liu,

Zhang,

et al. 2024

JGR Solid Earth

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The identification of the Grenvillian‐age ophiolite suites in the Yangtze block in recent years suggested that the northern Yangtze subblock (NYB) and the southern Yangtze subblock (SYB) were once separated by an ocean in late Mesoproterozoic. Although some paleogeographic models advocated the Pre‐Grenvillian connections between the south China blocks and Laurentia, none of them has been paleomagnetically tested. Here we report the new paleomagnetic results obtained from the ∼1,270 Ma purplish‐red muddy dolomite beds of the Luanshigou Formation, Shennongjia Group, NYB, providing new constraints for reconstructing the paleogeographic positions of the south China blocks in late Mesoproterozoic. A total of 447 samples underwent stepwise thermal demagnetization. Two components were identified. The low‐temperature component is interpreted as the recent viscous remnant magnetization. The high‐temperature component was obtained from 64 samples below 580°C and from 177 samples below 690°C, directed northeast‐up or southwest‐down, antipodally, positioning the paleomagnetic pole at 18.5°S, 74.4°E (dm/dp = 2.5/1.6°). Rock magnetic results demonstrate that the magnetic carriers in purplish‐red dolomite and pale‐pink dolomite are predominated by hematite and magnetite, respectively. The data quality is supported by an inverse baked contact test, a B‐class reversal test, and the paleomagnetic pole is distinct from any younger poles of the region. Based on the paleomagnetic results, aided by geological evidence, we propose a reconstruction in which the NYB was juxtaposed to southwestern Laurentia in the late Mesoproterozoic and suggest that the late Mesoproterozoic Miaowan‐Shimian ophiolite zone in the Yangtze block was likely an extension of the Grenville belt of Laurentia.

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