山东庙岛群岛黄土的粒度特征及其环境意义

Grain size characteristics and its indications of loess in Miaodao Islands,Shandong Province

对山东庙岛群岛长岛黄土粒度的精细研究证明,滨海黄土是在第四纪冰期寒冷气候下的产物,末次冰期沉积的长岛剖面由风成沉积与冲-洪积层组成,末次冰期的风成沉积反映了末次冰期气候的不稳定性,其中存在6次气候变冷、渤海湾海面下降和6次气候变暖、渤海湾海面上升的事件,黄土的粒度中包含了丰富的气候变化和渤海湾海面变化的信息。

Grain size of Changdao loess at Miaodao Islands was measured by Mastersizer 2000, it showed the seashore loess was transported and deposited by cold wind during the last glacial period in quaternary. The strata in Changdao section were composed of aeolian layer and a diluvial-alluvial layer; the deposits also indicated the instability of the last glaciation. There were six cold events, lowering the Bohai Sea level, six warm events , rising the level of the Bohai Sea. The grain size of loess sequence in Changdao of Miaodao Islands had provided detailed terrestrial records of climate change and the level changes of the Bohai Sea during the last glacial period.