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150~20 ka BP福建东部平潭岛海岸风成沉积的粒度特征及其环境意义
Authors
孟洁[1]
李保生[1,2]
+6 more
杨庆江[1]
温小浩[1]
牛东风[1]
王丰年[4]
蔡瑜杭[1]
郑琰明[3]
Publication date
30 November 2015
Publisher
Abstract
福建东部平潭岛白青乡剖面由一套白-灰黄色风成砂(简称"风成砂")和红色风成砂("老红砂")互相叠覆构成,其时代为150~20ka BP。粒度分析结果显示,剖面中的风成砂和老红砂都以砂粒级为主,次为粉砂,最少为黏土。这两者的粒度参数特征与当地现代海滩沙存在显著差别,与现代风成沙相似,但这两者均比现代风成沙具有较高含量的粉砂和黏土。这些粒度及其参数特征揭示出150~20ka BP福建东部海岸地区经历了4个暖湿亚段 "W"和4个冷干亚段"C",分别为W4(133~117ka BP)、W3(108~99ka BP)、W2(84~67ka BP)、W1(50~20 ka BP)和C4(150~133ka BP)、C3(117~108ka BP)、C2(99~84ka BP)和C1(67~50ka BP)。这些"W"和"C"亚段与LR04深海氧同位素、65°N夏季太阳辐射和相对海平面变化在气候波动性质和相位上相对应。150~20 ka BP在万年尺度上,中国东南沿海海岸风沙沉积受到诸如太阳辐射、东亚季风和海平面波动等全球大背景因素控制。</p
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Last time updated on 03/02/2019