| 鲁中黄土粒度特征及其成因探讨 |
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| 引用本文： | 刘乐军,李培英,王永吉.鲁中黄土粒度特征及其成因探讨[J].海洋地质与第四纪地质,2000,20(1):81-86. |
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| 作者姓名： | 刘乐军 李培英 王永吉 |
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| 作者单位： | 1. 国家海洋局第一海洋研究所,青岛,266003;中国科学院海洋研究所,青岛,266071
2. 国家海洋局第一海洋研究所,青岛,266003 |
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| 基金项目： | 教育部科学技术研究项目，Q95E0399， |
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| 摘 要： | 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霞的莱州湾海底和黄泛平原。粗颗粒含量变化一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回冷事件，形
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| 关 键 词： | 鲁中黄土 粒度 成因机制 沉积环境 黄土 古气候 |
| 修稿时间： | 1999-07-22 |
THE GRAIN-SIZE PROPERTIES AND GENESIS OF THE LOESS IN CENTRAL SHANDONG PROVINCE |
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| LIU Lejun,LI Peiying,WANG Yongji.THE GRAIN-SIZE PROPERTIES AND GENESIS OF THE LOESS IN CENTRAL SHANDONG PROVINCE[J].Marine Geology & Quaternary Geology,2000,20(1):81-86. |
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| Authors: | LIU Lejun LI Peiying WANG Yongji |
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| Abstract: | Based on field investigation and high resolution result of grain size as well as the correlation with loess in inland areas,the origin and depositional environment of central Shandong loess are expounded.The profile at Yunmen in Qingzhou was selected as the typical profile for this study.The sequence of Yunmen loess profile is over 40m in thickness and can be divided into three units:the Holocene loess layer,the Malan loess layer in upper Pleistocene and the Lishi loess layer in middle Pleistocene respectively.The loess is typical eolian deposits and mainly composed of proximal materials transported by local low layer winds (northerlies),and less commonly of inland distal material carried by high layer circulation winds.The main provenances are the flood plain of the Yellow River and the Laizhou Bay to the north of the loess distribution area.The grain size curves of the loess samples in the Yunmen loess profile are well related to the deposition of loess layers and the development of paleosol layers.According to the grain size curves and the stratigraphic structure,climate in central Shandong is known to become cooler in the middle late stage of the middle Pleistocene,when loess sediments began to deposit in the study area.Since then,this area has experienced 12 cold dry and warm wet climatic fluctuations,which caused the formation of the stratigraphic sequences with six loess layers separated by six paleosol layers. |
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| Keywords: | loess grain size properties genesis central Shandong Province |
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