Grain size characteristics and their environmental significance of terrigenous constituents in deep-sea sediments at IODP Site U1313 in North Atlantic during the Early Pleistocene
Zhai Qiumin1, Guo Zhiyong1,2, Li Lei3, Wang Hairong4
1 Institute of Resources and Environment，Henan University，Kaifeng 475004，Henan 2 College of Oceanographic and Geographic Sciences，Nanjing University，Nanjing 210093，Jiangsu 3 College of Water Sciences，Beijing Normal University，Beijing 100875 4 Henan Provincial Non-ferrous Metals Geological and Mineral Resources Bureau，Zhengzhou 450002，Henan
Abstract The North Atlantic is the key region in researches of global climate change.In this paper，we have done grain-size analysis with the terrigenous constituents of deep-sea sediments from the IODP(Integrated Ocean Drilling Program) Site U1313，the results show that the terrigenous constituents mainly composed of clay and very fine slit，and the fine-grain materials(grain diameter less than 4μm)is a main component.Combining with palaeobiological data and stable isotope dating，we reconstruct the evolution of paleoclimate，the palaeoclimate in the North Atlantic during the Early Pleistocene is divided into three phases:(1)2.415～1.897 Ma BP，climate fluctuated periodically;(2)1.897～1.640 Ma BP，the climate changed gently;(3)1.640～1.471 Ma BP，climate changed violently and frequently.The events of grain size suddenly increased correspond to the cold events during the Early Pleistocene.The suddenly change of grain size parameter nearby 1.6 Ma BP possibly linked to the earth orbital parameters change，which shows the importance of orbital parameter as external driving force to earth climate.
About author: Zhai Qiumin，born in 1973，is a professor and works in College of Environment and Planning，Henan University.She is mainly engaged in researches of the Quaternary and global environment change.E-mail: zhai1998@henu.edu.cn.
Cite this article:
Zhai Qiumin,Guo Zhiyong,Li Lei et al. Grain size characteristics and their environmental significance of terrigenous constituents in deep-sea sediments at IODP Site U1313 in North Atlantic during the Early Pleistocene[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(2): 261-268.
Zhai Qiumin,Guo Zhiyong,Li Lei et al. Grain size characteristics and their environmental significance of terrigenous constituents in deep-sea sediments at IODP Site U1313 in North Atlantic during the Early Pleistocene[J]. JOPC, 2012, 14(2): 261-268.
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