对杭州湘湖剖面高密度连续采集的样品,分析了Fe2O3、FeO、TiO2、CaCO3、Al2O3及Fe2O3/FeO比值的高分辨记录,发现它们对全新世的重要地层界面都有较清晰的反映,同时揭示了不同沉积环境下地球化学背景值存在显著的差异.运用Fe3+/Fe2+与年...对杭州湘湖剖面高密度连续采集的样品,分析了Fe2O3、FeO、TiO2、CaCO3、Al2O3及Fe2O3/FeO比值的高分辨记录,发现它们对全新世的重要地层界面都有较清晰的反映,同时揭示了不同沉积环境下地球化学背景值存在显著的差异.运用Fe3+/Fe2+与年平均温度的关系式推算了各样品点的古温度值,并结合多种地球化学指标、14C测年结果以及岩性岩相组合特征,将湘湖地区全新世早、中期(10～3 ka B.P.)初步划分为4个气候发展阶段,并指出7.5～5.1 kaB.P.之间为本区的全新世气候适宜期.展开更多
The soil microorganisms at different depths play an important role in soil formation,ecosystem biogeochemistry,recycling of nutrients,and degradation of waste products.The aims of this study were to observe the microb...The soil microorganisms at different depths play an important role in soil formation,ecosystem biogeochemistry,recycling of nutrients,and degradation of waste products.The aims of this study were to observe the microbial diversity in the profile of an agricultural soil in northern China,and to research the correlation between soil microbes and geochemistry.First,the soil geochemistry of the profile was investigated through 25 chemical elements.Secondly,the various physiological groups of microorganisms were...展开更多
Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite,quartzite granite and charnockite.Geochemical features of these crystalline rocks and their overlying in-situ weathering prof...Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite,quartzite granite and charnockite.Geochemical features of these crystalline rocks and their overlying in-situ weathering profiles are investigated and reported.Analytical result from ICP-MS facility at the University of Malaya reveals average SiO_(2) content in quartzite(91.1%),granite(73.8%),migmatite(67.4%)and charnockite(58.6%)categorize the rocks as siliceous.SiO_(2) contents in the weathering profiles above these rocks are 61.9%,60.2%,52.2%and 54.6%respectively.Alumina contents in the weathering profiles overlying quartzite(23.8%),granite(19.9%),migmatite(26.3%)and charnockite(24.3%)are substantially higher than the precursor rocks.In the same order,average alkali(Na_(2)O+K_(2)O)contents in the profiles are 3.38%,3.42%,3.48%and 2.68%.Chemical features of the profiles reflect that there exists some correlation between the chemistry of crystalline basement and their in-situ weathering profiles.The residual soils contain low plastic clays with kaolinitic characteristics and compare well with other clays reported from other parts of Nigeria basement complex.展开更多
文摘对杭州湘湖剖面高密度连续采集的样品,分析了Fe2O3、FeO、TiO2、CaCO3、Al2O3及Fe2O3/FeO比值的高分辨记录,发现它们对全新世的重要地层界面都有较清晰的反映,同时揭示了不同沉积环境下地球化学背景值存在显著的差异.运用Fe3+/Fe2+与年平均温度的关系式推算了各样品点的古温度值,并结合多种地球化学指标、14C测年结果以及岩性岩相组合特征,将湘湖地区全新世早、中期(10～3 ka B.P.)初步划分为4个气候发展阶段,并指出7.5～5.1 kaB.P.之间为本区的全新世气候适宜期.
文摘The soil microorganisms at different depths play an important role in soil formation,ecosystem biogeochemistry,recycling of nutrients,and degradation of waste products.The aims of this study were to observe the microbial diversity in the profile of an agricultural soil in northern China,and to research the correlation between soil microbes and geochemistry.First,the soil geochemistry of the profile was investigated through 25 chemical elements.Secondly,the various physiological groups of microorganisms were...
文摘Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite,quartzite granite and charnockite.Geochemical features of these crystalline rocks and their overlying in-situ weathering profiles are investigated and reported.Analytical result from ICP-MS facility at the University of Malaya reveals average SiO_(2) content in quartzite(91.1%),granite(73.8%),migmatite(67.4%)and charnockite(58.6%)categorize the rocks as siliceous.SiO_(2) contents in the weathering profiles above these rocks are 61.9%,60.2%,52.2%and 54.6%respectively.Alumina contents in the weathering profiles overlying quartzite(23.8%),granite(19.9%),migmatite(26.3%)and charnockite(24.3%)are substantially higher than the precursor rocks.In the same order,average alkali(Na_(2)O+K_(2)O)contents in the profiles are 3.38%,3.42%,3.48%and 2.68%.Chemical features of the profiles reflect that there exists some correlation between the chemistry of crystalline basement and their in-situ weathering profiles.The residual soils contain low plastic clays with kaolinitic characteristics and compare well with other clays reported from other parts of Nigeria basement complex.
