Geochemistry and tectonic implication of the sedimentary rocks in Lengjiaxi Group in northeastern Hunan

Lengjiaxi Group is the earliest material record of Jiangnan orogenic belt in Hunan.There exist debates about the sedimentary tectonic setting of Lengjiaxi Group and the related location of Qinzhou-Hangzhou juncture.Based on field investigation, the authors collected fresh samples from the sandstones...

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Published in地质科技通报 Vol. 40; no. 1; pp. 1 - 13, 26
Main Authors Daoyuan Bai, Qisheng Jiang, Bin Li, Wen Jiang, Yinmin Li
Format Journal Article
LanguageChinese
Published Editorial Department of Bulletin of Geological Science and Technology 01.01.2021
Subjects
back-arc basin
geochemistry
lengjiaxi group
northeastern hunan
tectonic migration
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Summary:Lengjiaxi Group is the earliest material record of Jiangnan orogenic belt in Hunan.There exist debates about the sedimentary tectonic setting of Lengjiaxi Group and the related location of Qinzhou-Hangzhou juncture.Based on field investigation, the authors collected fresh samples from the sandstones in lower-middle Lengjiaxi Group from Jinjing, northeastern Hunan, analysed their major and trace element compositions, studied the geochemistry of the sandstones in groups by age, and then probed into the basin type and tectonic framework.The sandstones on the whole are characterized by considerable variations of petrochemical components, lower SiO2 contents, high Al2O3 contents, high Al2O3/SiO2 and K2O/Na2O ratios.The REE distribution patterns are similar to typical post-Archean shales and the upper continental crust, with LREE enrichment, flat HREE, and significant negative Eu-anomalies.Characteristics of major elements suggest that the sedimentary environment was back-arc basin, and that the Yijiaqiao Formation
ISSN:2096-8523
DOI:10.19509/j.cnki.dzkq.2021.0017