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首页> 外文期刊>Arabian journal of geosciences >Provenance and diagenesis of the Upper Jurassic Qigu Formation sandstones in the southern Junggar Basin, NW China
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Provenance and diagenesis of the Upper Jurassic Qigu Formation sandstones in the southern Junggar Basin, NW China

机译：西北准Basin尔盆地上侏罗统齐古组砂岩的物源和成岩作用

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摘要

The Upper Jurassic Qigu Formation sandstones in the southern Junggar Basin typically have calcite cements. Two stages of calcite cements which were distinguished based on cathodoluminescence and casting body slice image increased rock pressure resistance to a certain extent, effectively prevented the quartz overgrowth, and are characterized by a style of filling of intergranular porosity that deteriorated the reservoir permeability. Result from the laser ablation inductively coupled plasma mass spectrometry indicates that the detrital zircons in the Qigu Formation sandstones are mostly magmatic in origin with U-Pb zircon ages of similar to 300 and similar to 160 Ma. These detrital zircons were largely derived from the Late Carboniferous to Early Permian and Late Jurassic magmatic rocks in the Tianshan area. All clastic rocks exhibit negative Nb, Ta, and Ti anomalies on primitive mantle-normalized elemental diagrams and high Al2O3/TiO2 ratios, implying the existence of a sedimentary source dominated by intermediate and felsic magmatic rocks. Our result indicates that the Late Jurassic volcanism may be extensively distributed around the Tianshan area. The diagenesis of calcite cements could decrease the Al2O3, TiO2, MgO, K2O, Hf, Th, and Zr contents and increase the MnO content, which may play an important role in variational contents of elements.
机译：准gar尔盆地南部的上侏罗统齐古组砂岩通常含有方解石水泥。基于阴极发光和铸造体切片图像区分的两步方解石水泥在一定程度上提高了岩体的抗压强度，有效地防止了石英的过度生长，其特征是晶间孔隙填充方式使储层渗透率恶化。激光烧蚀-电感耦合等离子体质谱的结果表明，齐古组砂岩中的碎屑锆石多为岩浆成因，U-Pb锆石年龄约300到160 Ma。这些碎屑锆石主要来自天山地区晚石炭世至早二叠世以及晚侏罗世岩浆岩。在原始地幔归一化元素图上，所有碎屑岩均表现出负的Nb，Ta和Ti异常，并且Al2O3 / TiO2比率高，这表明存在以中，长英质岩浆岩为主的沉积源。我们的结果表明，晚侏罗世火山活动可能在天山地区广泛分布。方解石胶结剂的成岩作用可以降低Al2O3，TiO2，MgO，K2O，Hf，Th和Zr的含量，增加MnO的含量，这可能对元素的含量变化起重要作用。

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