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《Marine Geology & Quaternary Geology》 2007-01
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THE ELEMENTAL TRANSPORT FEATURES OF RED EARTH FROM TX-SECTION AND ITS PALEO-CLIMATIC IMPLICATIONS

ZHU Li-dong1,2,ZHOU Shang-zhe3,LI Feng-quan2,YE Wei2,CUI Qiang2(1 College of Resource and Environment,Lanzhou University,Lanzhou 730000,China;2 Zhejiang Normal University,Jinhua 321004,China;3 Geography Department,Huanan Normal University,Guangzhou 510631,China)  
Red earth is an important carrier to record paleo-climatic and paleo-environmental evolution.The major element compositions from TX red earth section in Jinhua-Quzhou basin show that(1) SiO2,Fe2O3 and Al2O3 are dominated chemical components for all samples,the average content of SiO2 is lower than that of UCC,those of Fe2O3 and Al2O3 are both higher than that of UCC,and K,Na,Ca,Mg,and P are very low.So,TX-section has typical desilica-allitization features.(2) High CIA value and low Ba value both indicated stronger chemical weathering of TX-section,and its loss ignition(LOI) is linear related to CIA,Ba,SiO2/Al2O3,and SiO2/R2O3.To some degree,LOI may be regarded as an indicator for desilica-allitization of TX red earth.The higher LOI is,the stronger desilica-allitization.(3) SiO2/Al2O3 and SiO2/R2O3 indicate the trend of chemical weathering of TX-section: the degree of weathering increasing down-section,and being further confirmed by TiO2-Al2O3,TiO2-Fe2O3,TiO2-SiO2,and Al2O3-K2O distributions,from which we can see that chemical weathering degree of plinthitic red earth was stronger than that of typical red earth.(4) Using Zr as calculation strain,mass-balance equations were applied to geochemical analyses to show that Si moves out and Fe and Al are enriched in the plinthitic red earth unit.The τj,w coefficient also responded to the trend of weathering weakening upward.
【Fund】: 国家自然科学基金项目(40371013);; 浙江省自然科学基金项目(Y504124);; 浙江省教育厅重点资助项目(032314)
【CateGory Index】: P595
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