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THE GRAIN-SIZE PROPERTIES AND GENESIS OF THE LOESS IN CENTRAL SHANDONG PROVINCE
Author(s): LIU Lejun, LI Peiying, WANG Yongji
Pages: 81-
86
Year: 2000
Issue:
1
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY
Keyword: 鲁中黄土; 粒度; 成因机制; 沉积环境;
Abstract: 鲁中黄土是风成的,主要由低空地方风系(北向风)搬运的近源物质堆积而成,其次是高空气流携带而来的内陆远源物质;主要物源区为冰期裸露的莱州湾海底和黄泛平原.粗颗粒含量变化曲线较好地反映本区气候的冷暖周期变化.中更新世中后期本区开始转冷,发育离石黄土;末次间冰期时,气候温湿形成厚层S1;到末次冰期气候变得更为干冷,冬季风效应增强,粗颗粒含量增多.到全新世气候向现代气候转变,但在转暖的过程中有短期回冷事件,形成全新世黄土.
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