成都金沙遗址沉积物微量元素特征及环境意义  

Geochemical Features of Trace Elements in Sediments from Jinsha Relic Site,Chengdu:Implications for Environmental Changes

作　　者：文星跃[1,2] 曾娜[1] 黄成敏[1] 张擎 

机构地区：[1]四川大学建筑与环境学院,成都610065 [2]绵阳师范学院资源环境工程学院,四川绵阳621000 [3]成都市文物考古研究所,成都610071

出　　处：《西南大学学报（自然科学版）》2011年第8期151-156,共6页Journal of Southwest University(Natural Science Edition)

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-08-0379);高等学校学科创新引智计划资助项目(B08037)

摘　　要：采用电感耦合等离子体质谱仪(Q-ICP-MS)测试了成都金沙遗址河流相沉积物微量元素质量分数,并通过对微量元素质量分数和比值特征及其与粘粒、铁游离度和有机质等的相关性分析,探讨了微量元素特征对环境变化的指示意义.结果表明:Ba,Cr,Zr,Sr质量分数和Ba/Nb,Rb/Sr,Ba/Sr比值可用于指示沉积物源区环境的变化;龙门山及成都平原地区近3 400年以来的气候变化趋势为温暖湿润—温暖潮湿—温和偏干.沉积物微量元素特征分析与前人利用矿物、磁化率和孢粉分析手段的研究结果一致,揭示了古气候和古环境演变历史.The concentrations of trace elements in the sediments from Jinsha Relic Site,Chengdu,Sichuan（southwest China） were determined by Quadruple Inductively Coupled Plasma Mass Spectrometer（Q-ICP-MS）.Based on the determination of the contents of trace elements and their ratios and a correlation analysis of trace elements with the contents of clay and organic material and with degree of free iron in the sediments,their paleoclimatic implications were discussed.The results demonstrated that Ba,Cr,Zr and Sr concentrations and the Ba/Nb,Rb/Sr and Ba/Sr ratios could indicate the evolution of paleoclimate in source area of the sediments.In the Longmen Mountains and Chengdu Plain,the climate from 3400a B.P.was characterized by a change trend of warm-moist to warm-wetting and to moderate temperature and relatively rare rainfall.The paleoclimatic implication of trace element signatures was in agreement with the previous conclusion using clay minerals,magnetic susceptibility and spore-pollen methods.As a result,the geochemical features of trace elements in the sediments might be a potential proxy to reconstruct the regional paleoclimate and paleoenvironment.

关 键 词：沉积物 微量元素 地球化学特征 环境意义 金沙遗址 中国西南 

分 类 号：P595[天文地球—地球化学]