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引用本文:徐先海,方小敏,宋春晖,范马洁,沈吉.临夏盆地新生代沉积物粒度记录与亚洲内陆干旱化.湖泊科学,2008,20(1):65-75. DOI:10.18307/2008.0110
XU Xianhai,FANG Xiaomin,SONG Chunhui,FAN Majie,SHEN Ji.Grain-size records of Cenozoic Lacustrine sediments from Linxia Basin and the aridification of Asian Inland. J. Lake Sci.2008,20(1):65-75. DOI:10.18307/2008.0110
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临夏盆地新生代沉积物粒度记录与亚洲内陆干旱化
徐先海1,2, 方小敏3,2, 宋春晖2, 范马洁2, 沈吉4
1.安徽省安庆师范学院资源环境系, 安庆 246011;2.兰州大学西部环境教育部重点实验室&兰州大学地理系, 兰州 730000;3.中国科学院青藏高原研究所, 北京 100085;4.中国科学院南京地理与湖泊研究所, 南京 210008
摘要:
临夏盆地毛沟剖面高分辨率粒度记录研究表明,29-7.4Ma间,临夏盆地的古气候一直保持相对稳定,而其中短暂的沉积相的改变是盆地对该期间青藏高原构造隆升事件的响应;从7.4Ma开始,流域外的风尘物质开始逐步被带人盆地,并经过了6.4Ma和5.3Ma的两次加速过程,揭示了我国西北内陆干旱气候可能从7.4Ma左右开始,且在6.4Ma和5.3Ma左右经过两次加强.通过与青藏高原构造隆升事件记录和全球气候记录对比。揭示高原在9-7Ma开始的逐步隆升和期后的阶段性加速隆升以及同期开始的全球变冷,尤其北极冰盖的形成和扩张可能是亚洲内陆干旱化的重要驱动机制.
关键词:  临夏盆地  粒度  干旱化  高原隆升  全球变冷
DOI:10.18307/2008.0110
分类号:
基金项目:国家自然科学基金重点基础项目(40334038)资助
Grain-size records of Cenozoic Lacustrine sediments from Linxia Basin and the aridification of Asian Inland
XU Xianhai1,2, FANG Xiaomin3,2, SONG Chunhui2, FAN Majie2, SHEN Ji4
1.(Anqing Teachers' College, Anqing 246011,P. R. China;2.Key Laboratory of West China's Environmental Systems(MOE), Lanzhou Universtiy, Lanzhou 730000, P. R. China;3.Institute of Tibetan Plateau Research, CAS, Beijing 100085, P. R. China;4.Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, P. R. China
Abstract:
High-resolution grain size records from Maogou section in Linxia Basin were characterized with relative stable fluctuationfrom 29Ma and 7.4 Ma, and changes in several sedimentary facies responded to Tibetan uplift in some short intervals. At about 7.4Ma,aeolian dusts gradually entered into Linxia Basin, and input fluxes of aeolian dusts had two rapid increased phases respectively atabout 6.4Ma and 5.3Ma, suggesting that NW China drying climate began at 7.4 Ma and strengthened rapidly at 6.4Ma and 5.3Ma.Comparing of our records with the Tibetan uplift and global climatic records, we found that the gradual uplift of the Tibetan Plateauand global cooling, especially the onset of Arctic ice sheet, since about 9-8 Ma, may be the two important forcing mechanisms for thefast aridification of Asian inland
Key words:  Linxia Basin  grain size  aridification  Tibetan uplift  global cooling
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