| 安徽池州地区下蜀组沉积环境及成因探讨 |
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| 作者姓名： | 郭炳跃 王毅 张斌 张璟 苏晶文 杨洋 |
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| 作者单位： | 江苏省地质勘查技术院,南京,210049;中国地质调查局南京地质调查中心,南京,210016 |
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| 基金项目： | 中国地质调查项目;皖江经济带安庆—马鞍山沿江段1:5万环境地质调查项目 |
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| 摘 要： | 采用磁化率、黏土矿物测试及粒度分析等手段,结合区域第四纪地质特征,从气候演变和岩相古地理等角度探讨了安徽池州地区下蜀组的沉积环境及成因。该区下蜀组磁化率曲线呈波峰、波谷旋回特征;黏土矿物以伊利石为主,个别层位以蒙脱石、高岭石、绿泥石为主;粒度以粉砂为主,个别层位以粉砂及中粗砂为主。下蜀组沉积期间存在多次寒冷干燥到温暖潮湿的气候转换,整体为寒冷干燥气候的风成沉积,受古地理位置影响,沿江局部地区夹温暖潮湿气候条件下的长江水系冲积沉积。
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| 关 键 词： | 成因探讨 沉积环境 下蜀组 池州地区 安徽 |
| 收稿时间： | 2019-01-15 |
| 修稿时间： | 2019-05-06 |
The sedimentary environment and genesis analysis of the Xiashu Formation in the Chizhou area,Anhui Province |
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| Authors: | GUO Bing-yue WANG Yi ZHANG Bin ZHANG Jing SU Jing-wen YANG Yang |
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| Affiliation: | (1.Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049,China; 2.Nanjing Center, China Geological Survey, Nanjing 210016,China) |
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| Abstract: | Coupled with the regional geological characteristics of the Quaternary, sedimentary enviroment and genesis of the Xiashu Formation in Chizhou, Anhui Province were investigated from the aspects of paleoclimate and lithofacies paleogeography using magnetic susceptibility, clay mineral testing and particle size analysis. The magnetic susceptibility curve of the Xiashu Formation is characterized by cycle fluctuation properties of peak and valley. Clay mineral is dominated by illite, with individual layers dominated by montmorillonite, kaolinite and chlorite. The particulates occur mainly as silty sand, with several layers consisting of silty sand and medium-grained sand. The deposition of the Xiashu Formation was frequently influenced by the airflows fluctuations of cold-dry to warm-wet, generally characterized by aeolian deposit in the cold-dry climate. The paleogeographic locations also resulted in alluvial deposits of the Yangtze River system in some areas along the Yangtze River under the conditions of the warm humid climates. |
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| Keywords: | genesis investigation sedimentary environment Xiashu Formation Chizhou area Anhui Province |
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