华南老红砂沉积年代学及其环境意义:以福建青峰老红砂为例

发布时间：2018-11-22 13:27

【摘要】：对福建海坛岛青峰老红砂进行了系统的光释光测年研究,结合已发表的相关测年数据,在统一的时间标尺上探讨了老红砂发育过程及其与海平面变化和东亚季风变化之间的关系。结果表明:1 QFS剖面沉积年龄为110~33 ka,起始发育年龄延伸到了末次间冰期。主要涵盖了MIS5c~MIS3阶段,其中存在4个快速堆积期。结合已发表的年代学数据进行综合分析,认为前人得出的老红砂发育在末次冰期以来的结论需要得到修正。2华南老红砂发育过程与区域海平面变化密切相关。在末次间冰期和末次冰期均有发育,高海面(-50 m)或较高海面(-50~-70 m)时期是老红砂普遍发育期。区域地壳运动叠加海平面变化造成闽南和闽东北老红砂的沉积差异:海退过程中的较高海面时期北部先发生快速堆积;海侵过程中的较高海面时期南部先发生快速堆积。LGM(海平面-70 m)期,老红砂不发育。3老红砂在冰期-间冰期尺度上的沉积速率体现了源区气候和海平面变化对老红砂物源输送的双重制约。
[Abstract]:A systematic optical luminescent dating study of Laohong sand in Qingfeng, Haitan Island, Fujian Province was carried out, and combined with the published relevant dating data, The development process of Laohong sand and its relationship with sea level change and East Asian monsoon change are discussed on a unified time scale. The results showed that: 1 the sedimentary age of QFS profile was 110 ~ 33 ka, and the age of initial development extended to the last interglacial period. It mainly covers the MIS5c~MIS3 stage, in which there are four rapid accumulation periods. Combined with the published chronological data, it is considered that the previous conclusions of Laohong sand development since the last glacial period need to be corrected. 2 the development process of Laohong sand in South China is closely related to the regional sea level change. During the last interglacial period and the last glacial age, the period of high sea level (-50 m) or higher sea level (-50 ~ 70 m) is the general development period of Laohong sand. The regional crustal movement superimposed sea level change resulted in the sedimentary difference of Laohong sand in the south of Fujian and in the northeast of Fujian: the rapid accumulation occurred in the northern part of the higher sea level during the regression process; The rapid accumulation of. LGM (sea level (-70m) occurred in the southern part of the transgression. 3 the sedimentation rate of Laohong sand on the scale of glacial to interglacial age reflects the dual restriction of source climate and sea level change on the source transport of Laohong sand.
【作者单位】：福建师范大学地理研究所;福建师范大学地理科学学院;湿润亚热带生态地理过程教育部重点实验室;中国科学院青海盐湖研究所;
【基金】：国家自然科学基金项目(41301012,41271031) 国家自然科学基金委员会-福建省人民政府促进海峡两岸科技合作联合基金(U1405231)资助~~
【分类号】：P512.2

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