重力流与等深流交互作用沉积特征及演化 ——以鄂尔多斯盆地西南缘奥陶系平凉组为例
P618.13%P512.2; 重力流与等深流交互作用沉积作为深水沉积研究的热点之一,仍存在鉴别标志不完善及形成机理不明确等问题.基于野外露头、粒度数据及薄片等资料,分析了鄂尔多斯盆地西南缘陇县地区奥陶系平凉组沉积类型与特征,探讨了重力流与等深流交互作用沉积形成机理.结果表明陇县地区奥陶系平凉组沉积构造较丰富,粒度参数垂向差异明显,反映了3个演化期次:①中低能改造砂沉积,岩相表现为砂泥互层,见重力流与等深流沉积特征;②高能浊流沉积,表现为块状砂岩,见有正粒序层理等重力流沉积特征;③低能改造砂沉积,表现为砂泥互层,见有重力流与等深流沉积特征.平凉组沉积时期,浊流与处于海槽限制性环境内向西运移的等...
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| Published in | 地球科学与环境学报 Vol. 44; no. 5; pp. 775 - 788 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
长江大学 地球科学学院,湖北 武汉 430100
01.09.2022
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1672-6561 |
| DOI | 10.19814/j.jese.2022.05011 |
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| Abstract | P618.13%P512.2; 重力流与等深流交互作用沉积作为深水沉积研究的热点之一,仍存在鉴别标志不完善及形成机理不明确等问题.基于野外露头、粒度数据及薄片等资料,分析了鄂尔多斯盆地西南缘陇县地区奥陶系平凉组沉积类型与特征,探讨了重力流与等深流交互作用沉积形成机理.结果表明陇县地区奥陶系平凉组沉积构造较丰富,粒度参数垂向差异明显,反映了3个演化期次:①中低能改造砂沉积,岩相表现为砂泥互层,见重力流与等深流沉积特征;②高能浊流沉积,表现为块状砂岩,见有正粒序层理等重力流沉积特征;③低能改造砂沉积,表现为砂泥互层,见有重力流与等深流沉积特征.平凉组沉积时期,浊流与处于海槽限制性环境内向西运移的等深流进行交互作用,沉积类型及演化主要受浊流水动力强度控制.陇县地区奥陶系平凉组重力流与等深流交互作用沉积可分为2种机制:①浊流间歇期,后期等深流对早期未固结浊流沉积改造,即等深流改造重力流机制;②浊流活跃期,同地同期在垂向空间尺度上浊流与等深流彼此影响,即等深流与重力流同时作用机制. |
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| AbstractList | P618.13%P512.2; 重力流与等深流交互作用沉积作为深水沉积研究的热点之一,仍存在鉴别标志不完善及形成机理不明确等问题.基于野外露头、粒度数据及薄片等资料,分析了鄂尔多斯盆地西南缘陇县地区奥陶系平凉组沉积类型与特征,探讨了重力流与等深流交互作用沉积形成机理.结果表明陇县地区奥陶系平凉组沉积构造较丰富,粒度参数垂向差异明显,反映了3个演化期次:①中低能改造砂沉积,岩相表现为砂泥互层,见重力流与等深流沉积特征;②高能浊流沉积,表现为块状砂岩,见有正粒序层理等重力流沉积特征;③低能改造砂沉积,表现为砂泥互层,见有重力流与等深流沉积特征.平凉组沉积时期,浊流与处于海槽限制性环境内向西运移的等深流进行交互作用,沉积类型及演化主要受浊流水动力强度控制.陇县地区奥陶系平凉组重力流与等深流交互作用沉积可分为2种机制:①浊流间歇期,后期等深流对早期未固结浊流沉积改造,即等深流改造重力流机制;②浊流活跃期,同地同期在垂向空间尺度上浊流与等深流彼此影响,即等深流与重力流同时作用机制. |
| Author | 于星 谈梦婷 葛稳稳 李华 冯斌 孙玉玺 |
| AuthorAffiliation | 长江大学 地球科学学院,湖北 武汉 430100 |
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| Author_FL | GE Wen-wen TAN Meng-ting LI Hua FENG Bin YU Xing SUN Yu-xi |
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| DocumentTitle_FL | Sedimentary Characteristics and Evolution of Interaction Between Gravity Flow and Contour Current —A Case Study of Ordovician Pingliang Formation in the Southwest Margin of Ordos Basin,China |
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| Keywords | 粒度分析 平凉组 深水沉积 鄂尔多斯盆地 等深流 奥陶系 交互作用 重力流 |
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