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《Earth Science(Journal of China University of Geosciences)》 2010-05
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Clay Mineralogy and Its Paleoclimatic Indicator of the Miocene Sediments of Xunhua Basin

WANG Fen-li1,HONG Han-lie1,2,YIN Ke1,XU Yao-ming1,ZHANG Ke-xin1,2,3,ZHANG Jian-yu1,2 1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China 2.Key Laboratory of Biogeology and Enviromental Geology of Ministry of Education,China University of Geosciences,Wuhan 430074,China 3.Geological Survey of China University of Geosciences,Wuhan 430074,China  
To reconstruct the paleoclimate in the Miocene,clay mineralogy of the Xunhua sediments was investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods.Our results show that clay minerals of the Miocene sediments are mainly illite and smectite,with minor chlorite,kaolinite,and palygorskite.The apparent changes in their relative contents and illite crystallinity suggest that warm and humid paleoclimate conditions prevailed over the period of 23.1-21.2 Ma,then the mainly cold and dry climate succeeded in the period of 21.2-14.3 Ma,with short intervals of warm and humid climate conditions.The mainly warm and humid climate dominated in the period of 14.3-10.6 Ma,and it changed into a mainly cold and dry climate in the period of 10.6-9.3 Ma.The paleoclimate of the episode of 9.3-5.2 Ma was warm and humid,and it fluctuated frequently between cold/dry and warm/humid.The rapid changes in clay indices in the curves at 21.2 Ma and 5.8 Ma probably suggest the uplift in Xunhua of Qinghai-Tibet plateau.
【Fund】: 国家自然科学基金项目(Nos.40921062 40872038);; 中国地质调查局项目(No.1212010610103);; 地质过程与矿产资源国家重点实验室开放课题基金项目(No.GPMR200910)
【CateGory Index】: P532;P542.1
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