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Geochronology, Mineralogy, and Geochemistry of the Tonsteins from the Permo–Carboniferous Benxi Formation, Ordos Basin, North China Craton
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2023-04-16 , DOI: 10.1111/1755-6724.15063
Luojing WANG 1 , Dawei LV 1 , Zhihui ZHANG 1 , James C. HOWER 2 , Munira RAJI 3 , Yushuai ZHANG 1 , Yangyang SHEN 1 , Jie GAO 1
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2023-04-16 , DOI: 10.1111/1755-6724.15063
Luojing WANG 1 , Dawei LV 1 , Zhihui ZHANG 1 , James C. HOWER 2 , Munira RAJI 3 , Yushuai ZHANG 1 , Yangyang SHEN 1 , Jie GAO 1
Affiliation
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Tonstein layers are found worldwide in the Permo–Carboniferous coal-bearing strata. This study investigates the geochronology, mineralogy, and geochemistry of four tonstein samples from the Permo–Carboniferous Benxi Formation, Ordos Basin, North China Craton (NCC). The typical features of the studied tonsteins include thin beds, lateral continuity, angular quartz grains, and euhedral zircons with similar U-Pb ages, indicating a significant pyroclastic origin. In addition, the tonstein samples have low TiO2/Al2O3 ratios (<0.02) and rare earth elements and yttrium (REY) concentrations with obvious negative Eu anomalies, indicating that the tonsteins have a felsic magma origin. Moreover, compared with the mean composition of clay shale, the studied tonsteins are characterized by high concentrations of the elements Nb and Ta, which may affect the concentration of the corresponding elements in surrounding coal seams. The zircon U-Pb ages of the tonsteins (293.9–298.8 Ma) provide a precise chronological framework on the Benxi Formation in the Ordos Basin, constraining the Gzhelian–Aselian stages. The tonsteins were probably sourced from arc volcanism along the western margin of the NCC during the early Permian, implying that the Alxa Terrane had not amalgamated with the NCC at that time.
中文翻译：
华北克拉通鄂尔多斯盆地二叠纪-石炭系本溪组Tonsteins的年代学、矿物学和地球化学
Tonstein 层在世界各地的二叠纪-石炭系含煤地层中都有发现。本研究对来自华北克拉通（NCC）鄂尔多斯盆地二叠纪-石炭系本溪组的四个吨斯坦样品进行了地质年代学、矿物学和地球化学研究。所研究的吨石的典型特征包括薄层、横向连续性、有角的石英颗粒和具有相似U-Pb年龄的自形锆石，表明其具有重要的火山碎屑成因。此外，吨斯坦岩样品的TiO 2 /Al 2 O 3比值较低（<0.02），稀土元素和钇（REY）浓度具有明显的负Eu异常，表明吨斯坦岩具有长英质岩浆起源。此外，与粘土页岩的平均成分相比，所研究的吨斯坦岩具有高浓度元素Nb和Ta的特点，这可能会影响周围煤层中相应元素的浓度。tonsteins的锆石U-Pb年龄（293.9-298.8 Ma）为鄂尔多斯盆地本溪组提供了精确的年代框架，限制了Gzhelian-Aselian阶段。吨斯坦岩可能源自二叠纪早期华北克拉通西缘的弧火山活动，这意味着当时阿拉善地体尚未与华北克拉通合并。
更新日期：2023-04-16
中文翻译：
华北克拉通鄂尔多斯盆地二叠纪-石炭系本溪组Tonsteins的年代学、矿物学和地球化学
Tonstein 层在世界各地的二叠纪-石炭系含煤地层中都有发现。本研究对来自华北克拉通（NCC）鄂尔多斯盆地二叠纪-石炭系本溪组的四个吨斯坦样品进行了地质年代学、矿物学和地球化学研究。所研究的吨石的典型特征包括薄层、横向连续性、有角的石英颗粒和具有相似U-Pb年龄的自形锆石，表明其具有重要的火山碎屑成因。此外，吨斯坦岩样品的TiO 2 /Al 2 O 3比值较低（<0.02），稀土元素和钇（REY）浓度具有明显的负Eu异常，表明吨斯坦岩具有长英质岩浆起源。此外，与粘土页岩的平均成分相比，所研究的吨斯坦岩具有高浓度元素Nb和Ta的特点，这可能会影响周围煤层中相应元素的浓度。tonsteins的锆石U-Pb年龄（293.9-298.8 Ma）为鄂尔多斯盆地本溪组提供了精确的年代框架，限制了Gzhelian-Aselian阶段。吨斯坦岩可能源自二叠纪早期华北克拉通西缘的弧火山活动，这意味着当时阿拉善地体尚未与华北克拉通合并。
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