浮游有孔虫表层水种不同形态类型壳体的Sr/Ca记录  

Comparison in Sr/Ca ratios of different morphotypes of surface dwelling planktonic foraminifera species

作　　者：贾奇 李铁刚 熊志方 秦秉斌 JIA Qi;LI Tiegang;XIONG Zhifang;QIN Bingbin(First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;Laboratory for Marine Geology,Laoshan Laboratory,Qingdao 266237,China)

机构地区：[1]自然资源部第一海洋研究所海洋地质与成矿作用重点实验室,青岛266061 [2]崂山实验室海洋地质过程与环境功能实验室,青岛266237

出　　处：《海洋地质与第四纪地质》2023年第4期10-16,共7页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目“晚中新世以来印度洋-太平洋暖池水体交换过程及其气候效应”(41830539);崂山实验室科技创新项目“新生代西太平洋环境演化的沉积记录及机制”(LSKJ202204200);泰山学者工程专项——泰山学者特聘专家计划(ts20190963)。

摘　　要：浮游有孔虫表层水种Globigerinoides ruber (白色)和Trilobatus sacculifer壳体是过去海洋环境信息的重要载体,其壳体Sr/Ca比值在重建古海洋环境变化中具有较大潜力,因此本文旨在探讨G. ruber(白色)和T. sacculifer的不同形态类型Sr/Ca比的差异及其影响因素。对取自西菲律宾海的MD06-3047B沉积物岩芯中G. ruber的两种形态类型,即G. ruber(sensu stricto, s.s.)和G. ruber(sensu lato, s.l.),以及T. sacculifer的两种形态类型,即T. sacculifer (with sac)和T. sacculifer (without sac)壳体的Sr/Ca进行了测试分析。结果显示,MIS 3期(~48 ka)以来,MD06-3047B岩芯中G. ruber s.s.和G. ruber s.l.的Sr/Ca差异较小;而T. sacculifer (with sac)和T. sacculifer (without sac)的Sr/Ca存在显著差异,且前者显著高于后者。通过与同站位表层海水温度和盐度等记录的对比,发现研究区G.ruber s.s.、G. ruber s.l.和T. sacculifer (without sac)壳体的Sr/Ca可能主要受控于海水温度,而T. sacculifer (with sac)壳体Sr/Ca受到海水盐度的影响。Surface-dwelling foraminifera species Globigerinoides ruber(white)and Trilobatus sacculifer are the main proxy carriers for past oceanic environments.The Sr/Ca ratios of foraminifera play an important role in reflecting paleo-oceanic environmental changes.To understand the potential differences between the Sr/Ca ratios of these different morphotypes of G.ruber(white)and T.sacculifer and relevant affecting factors,we compared the Sr/Ca measurements of the two basic morphotypes of G.ruber(G.ruber sensu stricto and G.ruber sensu lato)and T.sacculifer(with sac and without sac)via the analysis of surface and downcore samples of sediment from Core MD06-3047B in the Western Philippine Sea.Results reveal that the Sr/Ca ratios of the two morphotypes of G.ruber(white)show a little difference since MIS 3(~48 ka),while those of two types of T.sacculifer are significantly different from each other,of which that of T.sacculifer(without sac)is generally greater than that of the with-sac type.By comparing the seawater temperature and salinity from the same site,we found that the Sr/Ca ratios of G.ruber s.s.,G.ruber s.l.and T.sacculifer(without sac)in our study area might be affected mainly by seawater temperature,and those of T.sacculifer(with sac)are mainly affected by surface salinity.

关 键 词：浮游有孔虫 形态类型 G.ruber(white) T.sacculifer Sr/Ca 

分 类 号：P736[天文地球—海洋地质]