| 皖北地区新元古代构造背景的转换:来自碎屑岩地球化学的证据 |
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| 引用本文： | 孙林华,桂和荣.皖北地区新元古代构造背景的转换:来自碎屑岩地球化学的证据[J].地球学报,2011,32(5):523-532. |
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| 作者姓名： | 孙林华 桂和荣 |
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| 作者单位： | 宿州学院地球科学与工程学院;宿州学院地球科学与工程学院 |
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| 基金项目： | 安徽省高校优秀青年人才基金(编号: 2010SQRL190); 宿州学院科研平台项目(编号: 2010YKF30) |
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| 摘 要： | 在对安徽省北部宿州新元古代史家组砂岩地球化学特征分析的基础上,结合前人发表的淮南和凤阳新元古代刘老碑组页岩的地球化学数据,对它们的物源和构造背景进行了对比讨论.结果表明:刘老碑组页岩的地球化学特征表明其来自于中-酸性火成岩高程度的首次风化,而史家组砂岩则来自于经历了再循环的古老地壳物质较低程度的风化.刘老碑组页岩相对史...
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| 关 键 词： | 地球化学 碎屑岩 新元古代 构造背景 皖北 |
Transition of Neoproterozoic Tectonic Background in Northern Anhui Province: Evidence from Geochemistry of Clastic Rocks |
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| SUN Lin-hua and GUI He-rong.Transition of Neoproterozoic Tectonic Background in Northern Anhui Province: Evidence from Geochemistry of Clastic Rocks[J].Acta Geoscientia Sinica,2011,32(5):523-532. |
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| Authors: | SUN Lin-hua and GUI He-rong |
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| Institution: | School of Earth Science and Engineering, Suzhou University;School of Earth Science and Engineering, Suzhou University |
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| Abstract: | Based on a geochemical analysis of sandstones of Neoproterozoic Shijia Formation in Suzhou of northern Anhui Province, in combination with previously published geochemical data of shales of Neoproterozoic Liulaobei Formation, the authors made a comparatively study of the provenance and tectonic setting of these two suites of clastic rocks. The results indicate that the shales of Liulaobei Formation might have originated from the first cycle of intermediate-felsic volcanic rocks with intense weathering, whereas sandstones of Shijia Formation were probably generated by low-intense weathering of the recycled old crust material. The shales of Liulaobei Formation are characterized by high (MgO+Fe2O3) and TiO2 content and Al2O3/SiO2 ratios relative to the sandstones of Shijia Formation. These data, together with La-Th-Sc and Th-Sc-Zr/10 discrimination diagrams, imply that they were deposited in different settings, i.e., the former was deposited in a continental island arc (probably back-arc basin), whereas the latter was in a passive continental margin or intra-plate environment. In combination with previous studies of the Neoproterozoic evolution in northern Anhui Province, these results demonstrate that the tectonic background of the southeast margin of North China Craton underwent transition from active to passive during Neoproterozoic. |
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| Keywords: | geochemistry clastic rock Neoproterozoic tectonic setting northern Anhui Province |
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