| 江西抚崇盆地上白垩统河口组砾石统计特征及其地质意义 |
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| 引用本文： | 陈留勤,郭福生,梁伟,蒋兴波.江西抚崇盆地上白垩统河口组砾石统计特征及其地质意义[J].现代地质,2013,27(3). |
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| 作者姓名： | 陈留勤 郭福生 梁伟 蒋兴波 |
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| 作者单位： | 1. 江西省核资源与环境重点实验室,江西南昌330013;中国地质科学院地质研究所,北京100037;东华理工大学地球科学学院,江西南昌330013
2. 东华理工大学地球科学学院,江西南昌,330013 |
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| 基金项目： | 博士后科研启动基金项目，江西省博士后科研择优资助项目，江西省教育厅资助科研项目，中国地质调查局工作项目，东华理工大学核资源与环境教育部重点实验室开放基金项目 |
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| 摘 要： | 华东南晚白垩世陆相断陷盆地以发育红色粗碎屑岩为特征。通过对赣杭构造带西段的江西抚崇盆地上白垩统河口组19个砾岩露头测点的砾组分析,对河口组砾岩的砾性、粒度、砾态和砾向等进行了详细研究。总体上砾石成分复杂,分选性较差,磨圆程度中等,呈次棱角-次圆状,风化程度较低。结合红盆周边基岩地层特点,对红盆不同区域砾岩的物质来源、成因和形成条件等进行分析和讨论。研究结果表明,河口组砾岩为晚白垩世半干旱-干旱气候条件下的一套冲积扇和辫状河相粗碎屑沉积,具有多物源和快速堆积的特点。盆地不同地区砾石成分组合特征具有明显差别,反映了盆地周围复杂的物源供应条件。根据盆地基岩地层岩性特点和扁平状砾石倾向玫瑰花图,认为河口组沉积时期,红盆碎屑沉积物主要来自盆地的北东、北、北西和南东部。
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| 关 键 词： | 砾组分析 物源 陆相红层 上白垩统 赣杭构造带 抚崇盆地 |
Gravel Fabric Characteristics of the Upper Cretaceous Hekou Formation in Fuzhou-Chongren Basin, Jiangxi and the Geological Significance |
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| CHEN Liu-qin
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GUO Fu-sheng
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LIANG Wei
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JIANG Xing-bo.Gravel Fabric Characteristics of the Upper Cretaceous Hekou Formation in Fuzhou-Chongren Basin, Jiangxi and the Geological Significance[J].Geoscience——Journal of Graduate School,China University of Geosciences,2013,27(3). |
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| Authors: | CHEN Liu-qin GUO Fu-sheng LIANG Wei JIANG Xing-bo |
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| Abstract: | Continental basins of the Late Cretaceous in southeast China are characterized by red coarse terrestrial clastic rocks.Fabric analysis of gravels was carried out at 19 outcrops of the Upper Cretaceous Hekou Formation of Fuzhou-Chongren basin in western Gan-Hang tectonic belt,and the composition,particle size,shape and preferred orientations of gravels were also studied in detail.As a whole,the gravel deposits are featured by complex composition,poor sorting,subangular to subrounded particles and low degree of weathering.Combined with lithologic features of bedrocks,the source,genesis and formation conditions of gravels at different areas are analyzed and discussed.The research result shows that the gravels of the Late Cretaceous Hekou Formation were the products of alluvial fan and braided river facies in a semiarid to arid climate condition with multi-source and rapid accumulation.The composition assemblages of gravels from different areas of the basin are obviously different,reflecting complex provenance condition around the basin.Based on the characteristics of bedrock strata and the rose diagrams of the maximum flat planes(ab-planes) of gravels,the sediment source was inferred to come mainly from northeastern,northern,northwestern and southeastern parts of the basin during the sedimentation period of Hekou Formation. |
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| Keywords: | fabric analysis of gravel provenance continental red bed Upper Cretaceous Gan-Hang tectonic belt Fuzhou-Chongren basin |
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