现代Cariaco盆地浮游有孔虫个体的微量元素异质性

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
C. V. Davis, J. Fehrenbacher, C. Benitez‐Nelson, R. Thunell
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引用次数: 11

摘要

浮游有孔虫壳的微量元素组成受到环境和生物因素(“生命效应”)的影响。随着有孔虫个体壳中的微量元素越来越多地被用作古海洋学工具,了解微量元素在个体之间、物种之间以及对高频环境变化的响应是至关重要的。本文对2010-2012年在Cariaco盆地上游100 m采集的gloigerina ruber(粉色)、Orbulina universa和Globorotalia menardii浮游生物中单个贝壳微量元素(Mg、Sr、Ba和Mn)与Ca的比值进行了3年的浮游生物拖记录。浮游生物拖曳与水柱化学和水文的原位测量相结合。Mg/Ca比值根据单物种平均Mg/Ca的种间温度关系计算,反映了三种物种不同的钙化温度。然而,单个壳的Mg/Ca往往导致不切实际的温带估计。四种植物的Sr/Ca比值相对稳定。Mn/Ca和Ba/Ca比值在马纳地鲀中最高,不反映开阔水域的元素浓度。在上升流条件下,所有物种的Mn/Ca比值都有所升高,在上升流期间收集的加利福尼亚边缘的新冠藻(Neogloboquadrina incompta)壳也有类似的趋势。总之,这表明升高的壳层Mn/Ca可能作为较深水团上涌的示踪剂。我们的研究结果强调了在有限深度的栖息地中,物种之间和物种内部存在很大程度的微量元素变异性,以及生物、钙化环境和物理混合在调节微量元素地球化学如何反映海洋表面环境变异性中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Trace Element Heterogeneity Across Individual Planktic Foraminifera from the Modern Cariaco Basin
The trace element composition of planktic foraminifera shells is influenced by both environmental and biological factors (‘vital effects’). As trace elements in individual foraminifera shells are increasingly used as paleoceanographic tools, understanding how trace element ratios vary between individuals, among species, and in response to high frequency environmental variability is of critical importance. Here, we present a three-year plankton tow record (2010–2012) of individual shell trace element (Mg, Sr, Ba, and Mn) to Ca ratios in the planktic species Globigerina ruber (pink), Orbulina universa, and Globorotalia menardii collected throughout the upper 100 m of Cariaco Basin. Plankton tows were paired with in situ measurements of water column chemistry and hydrography. The Mg/Ca ratio reflects different calcification temperatures in all three species when calculated using species-specific temperature relationships from single-species averages of Mg/Ca. However, individual shell Mg/Ca often results in unrealistic temperate estimates. The Sr/Ca ratios are relatively constant among the four species. Ratios of Mn/Ca and Ba/Ca are highest in G. menardii and are not reflective of elemental concentrations in open waters. The Mn/Ca ratio is elevated in all species during upwelling conditions, and a similar trend is demonstrated in Neogloboquadrina incompta shells from the California margin collected during upwelling periods. Together this suggests that elevated shell Mn/Ca may act as a tracer for upwelling of deeper water masses. Our results emphasize the large degree of trace element variability present among and within species living within a limited depth habitat and the roles of biology, calcification environment, and physical mixing in mediating how trace element geochemistry reflects environmental variability in the surface ocean.
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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