底栖有孔虫(Florilus decors)壳体微量元素/钙比值的LA-ICP-MS原位微区分析方法及应用——以长江口外海域为例  

In situ microanalysis of elements/Ca ratio in benthic foraminifera shells(Florilus decors)and its application——a case study off the Changjiang River Estuary

作　　者：南海明 许博超[1,3] 黄湘通 杨守业[4] 郭肖伊[1,2] 王飞飞 邱敏志[1,2] 张晓洁 于志刚[1,3] Nan Haiming;Xu Bochao;Huang Xiangtong;Yang Shouye;Guo Xiaoyi;Wang Feifei;Qiu Mingzhi;Zhang Xiaojie;Yu Zhigang(Key laboratory of Marine Chenistry Theory and Techonlogy/Ministry of Education,Ocean University of China,Qingdao 266100,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China;Marine Ecology and Environmental Science Laboratory,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266071,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China)

机构地区：[1]中国海洋大学海洋化学理论与工程教育部重点实验室,山东青岛266100 [2]中国海洋大学化学化工学院,山东青岛266100 [3]青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室,山东青岛266071 [4]同济大学海洋地质国家重点实验室,上海200092 [5]中国地质调查局青岛海洋地质研究所,山东青岛266071

出　　处：《海洋学报》2018年第10期158-166,共9页

基　　金：国家自然科学基金(41620104001;41521064;41576075);鳌山科技创新计划(2016ASKJ02)

摘　　要：深海沉积物中有孔虫壳体的微量元素、同位素测试技术已较为成熟,而河口近海沉积物中有孔虫壳体元素微区测试却鲜有报道。本文报道了一种利用激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)分析法测试取自长江口外沉积物中的有孔虫壳体元素/钙比值的技术,研究了氦气载气流量、能量密度、束斑大小、激光剥蚀频率等参数对测试结果的影响,优化了活体有孔虫原位分析方法。应用确定的测试条件对2016年7月取自长江口外的底栖有孔虫优美花朵虫样品(Florilus decors)进行测试,发现Mg、Sr等元素/钙比值在壳体不同位置上无显著差异,而Mn的数据较为离散,可能与有孔虫生长过程中经历的水环境及其变化有关。The analytical techniques for trace elements and isotopic ratios in foraminifera shells from deep-sea sediments have been well developed.However,few papers have reported the in situ elemental analysis from estuaries and coastal sediments.In this study,an in situ microanalytical method of elements/Ca for foraminifera(Florilus decors)shells from sediment off the Changjiang River Estuary via using Laser Ablation Inductively Coupled Plasma Mass Spectrometry(LA-ICP-MS)was explored.We tested a series of laser ablation conditions(e.g.,carrier flow,uence,laser spot size,repetition rate)to optimizing the analytical procedure.F.decors shells,collected from the sediment off Changjiang River Estuary in July 2016,were analyzed based on the procedure.We found Mg/Ca and Sr/Ca ratios on the foraminifera shells had no significant difference in different positions,but Mn/Ca had relative discrete trends,which might be caused by the foram living aquatic environment.

关 键 词：元素原位微区分析 LA-ICP-MS 有孔虫 长江口 

分 类 号：P736.4[天文地球—海洋地质]