| Phases of Environmental Evolution Indicated by Primary Chemical Elements and Paleontological Records in the Upper Pleistocene-Holocene Series for the Salawusu River Valley, China |
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| 作者姓名： | LI Baosheng WEN Xiaohao QIU Shifan David Dian ZHANG DU Shuhuan CHEN Deniu OU Xianjiao NIU Dongfeng |
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| 作者单位： | [1]School of Geography, South China Normal University, Guangzhou, Guangdong 510631 [2]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi＇an, Shaanxi 710061 [3]Department of Geography and Geology, the University ofHong Kong, Hong Kong [4]Institute of Zoology, Chinese Academy of Sciences, Beijing 100080 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金
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the RGC Grant of the HKSAR
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中国科学院基金 |
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| 摘 要： | Studies of lithology, sedimentary facies and the distribution regularity of SiO2 and Al2O3 contents and Al2O3/SiO2 ratio allow us to divide the Upper Pleistocene-Holocene Series represented by the MUanggouwan section in China＇s Salawnsu River valley into six segments： MGS1, MGS2, MGS3, MGS4, MGS5 and MGS6. The boundary ages for MGS1 （the Dishaogouwan and Dagouwan Formations）, MGS2 （the upper Chengchuan Formation）, MGS3 （the middle Chengchuan Formation）, MGS4 （the lower Chengchuan Formation）, MGS5 （most strata of the Salawusu Formation） and MGS6 （the bottom of the Salawusu Formation and the top of the Lishi Formation） correspond to those of MIS1, MIS2, MIS3, MIS4, MISS and MIS6, respectively, from deep sea sediments or continental glaciers. MGS5 can be subdivided into five subsegments （MGS5a, MGS5b, MGS5c, MGS5d and MGS5e） and the boundary ages of these subsegments correspond to those of MISSa, MISSb, MIS5c, MIS5d and MIS5e, respectively. Based on the paleoenvironment and paleoecology indicated by the primary chemical elements, fossil vertebrates, mollusks and pollen grains, we hypothesize that MGS1, MGS2, MGS3, MGS4, MGS5 and MGS6 and the subsegments of MGS5 match the corresponding stages for oxygen isotopes in the deep sea sediments and continental glaciers, and the substages of MIS5 in terms of climatic characters, further explaining the phenomena that determined the formation of the late Quaternary strata and the paleontology of the Salawusu River valley. These phenomena relate to fluctuations in the global climate （and particularly in the East Asian monsoon） during the glacial and interglacial periods.
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| 关 键 词： | 环境影响 生物进化 化学原理 中国 谷底 |
| 修稿时间： | 2006-06-152007-04-13 |
Phases of Environmental Evolution Indicated by Primary Chemical Elements and Paleontological Records in the Upper Pleistocene-Holocene Series for the Salawusu River Valley, China |
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| Authors: | LI Baosheng WEN Xiaohao QIU Shifan David Dian ZHANG DU Shuhuan CHEN Deniu OU Xianjiao and NIU Dongfeng School of Geography South China Normal University Guangzhou Guangdong State Key Laboratory of Loess and Quaternary Geology |
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| Institution: | LI Baosheng,WEN Xiaohao,QIU Shifan,David Dian ZHANG,DU Shuhuan,CHEN Deniu,OU Xianjiao and NIU Dongfeng School of Geography,South China Normal University,Guangzhou,Guangdong,State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an,Shaanxi,Department of Geography and Geology,the University of Hong Kong,Hong Kong,Institute of Zoology,Chinese Academy of Sciences,Beijing |
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| Abstract: | Studies of lithology,sedimentary facies and the distribution regularity of SiO_2 and Al_2O_3 contents and Al_2O_3/SiO_2 ratio allow us to divide the Upper Pleistocene-Holocene Series represented by the Milanggouwan section in China's Salawusu River valley into six segments:MGS1,MGS2,MGS3, MGS4,MGS5 and MGS6.The boundary ages for MGS1(the Dishaogouwan and Dagouwan Formations),MGS2(the upper Chengchuan Formation),MGS3(the middle Chengchuan Formation), MGS4(the lower Chengchuan Formation),MGS5(most strata of the Salawusu Formation) and MGS6(the bottom of the Salawusu Formation and the top of the Lishi Formation) correspond to those of MIS1,MIS2,MIS3,MIS4,MIS5 and MIS6,respectively,from deep sea sediments or continental glaciers.MGS5 can be subdivided into five subsegments(MGS5a,MGS5b,MGS5c, MGS5d and MGS5e) and the boundary ages of these subsegments correspond to those of MIS5a, MIS5b,MIS5c,MIS5d and MIS5e,respectively.Based on the paleoenvironment and paleoecology indicated by the primary chemical elements,fossil vertebrates,mollusks and pollen grains,we hypothesize that MGS1,MGS2,MGS3,MGS4, MGS5 and MGS6 and the subsegments of MGS5 match the corresponding stages for oxygen isotopes in the deep sea sediments and continental glaciers, and the substages of MIS5 in terms of climatic characters,further explaining the phenomena that determined the formation of the late Quaternary strata and the paleontology of the Salawusu River valley.These phenomena relate to fluctuations in the global climate(and particularly in the East Asian monsoon) during the glacial and interglacial periods. |
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| Keywords: | Salawusu River valley Upper Pleistocene-Holocene Series primary chemical elements phases of evolution paleontological records |
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