Tectonically-controlled infilling of the eastern Nihewan Basin,North China,since the middle Pleistocene  

作　　者：HAN ZhiYong LI XuSheng WANG Yong WANG XianYan YI ShuangWen LU HuaYu 

机构地区：[1]School of Geographic and Oceanographic Sciences,Nanjing University,Nanjing 210023,China [2]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《Science China Earth Sciences》2016年第7期1378-1389,共12页中国科学（地球科学英文版）

基　　金：supported by the Chinese Geological Survey(Grant No.12120113005600);the National Natural Science Foundation of China(Grant Nos.41472138&41371203)

摘　　要：There has been a significant debate about the nature and causes of the Pleistocene evolution of the Nihewan Basin, North China. We studied the eastern Nihewan Basin sedimentary facies at two main sites, Hutouliang and Donggou. A combination of field observations and measurements of sediment grain-size distribution was used to reconstruct the sequence of sedimentary environments since the middle Pleistocene, and optically-stimulated luminescence measurements were used to date the sediments. Our results indicate that a shallow lake occupied the basin center along the Sanggan River, probably lasting until -440 kyr ago before disappearing completely -340 kyr ago. It was succeeded by a phase of fluvial-dominated sediment accumulation which ended -30 kyr ago. We suggest that the formation of the gorge resulted from the relative uplift of the Niuxin Mountain along the Liulengshan fault -140 kyr ago. However, since -30 kyr ago the fault may have become inactive and the river downcutting near Shixia was no longer offset by the relative uplift, which caused a shift from deposition to denudation in the Nihewan Basin from then on. The disappearance of the paleolake -340 kyr ago may have been the culmination of the ongoing process of basin infilling.关于 Nihewan 盆的更新世进化的性质和原因有重要争论，诺思中国。我们在二个主要地点， Hutouliang 和 Donggou 学习了东方 Nihewan 盆沉积外形。领域观察的联合和沉积谷物尺寸分发的大小被用来重建自从中间的更新世，和光学地刺激的光大小，沉积环境的顺序被用来标明日期沉积。我们的结果显示一个浅湖沿着 Sanggan 河占据了盆中心，以前可能在完全消失前持续 440 kyr 直到 ~~ 340 kyr 以前。它被结束了 ~ 的河统治沉积累积的一个阶段接替 30 kyr 以前。我们建议峡的形成源于亲戚沿着 Liulengshan 差错 ~ Niuxin 山高举 140 kyr 以前。不管多么 ~ 30 kyr 以前，差错可能变得不活跃， Shixia 附近的河 downcutting 不再是由亲戚的偏移量高举，它从那时起在 Nihewan 盆从免职引起了移动到剥光。paleolake ~ 的消失 340 kyr 以前可以是盆 infilling 的进行中的过程的顶点。

关 键 词：Nihewan Basin Sedimentary facies Paleolake Fault OSL 

分 类 号：P534.631[天文地球—第四纪地质学]