爱琴海（东地中海）底栖有孔虫试验中钡掺入的控制。针对特定物种的Ba/Ca校准

IF 1.5 4区地球科学 Q2 PALEONTOLOGY

Marine Micropaleontology Pub Date : 2025-01-01 DOI:10.1016/j.marmicro.2024.102431

Jassin Petersen , Gerhard Schmiedl , Jacek Raddatz , André Bahr , Jörg Pross , Meryem Mojtahid

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引用次数: 0

摘要

我们用激光烧蚀ICP-MS分析了爱琴海7个地点岩心顶部活底栖有孔虫（地中海Uvigerina mediterranea和Melonis affinis）的Ba/Ca比值。在活的和死的地中海鳗标本中Ba/Ca没有显著的差异。对于M. affinis，我们应用了活标本中极高Ba/Ca的阈值标准，以突出整体均匀的Ba/Ca信号。Ba/Ca测试内变异性在每个样品的相对标准偏差为16%至24%之间变化。它归因于生物矿化过程，即生命效应。在大多数地点和不同沉积物深度的样品中，affinis的Ba/Ca比值显著高于U. mediterranea。生物矿化过程和/或微生境效应对两种物种Ba/Ca的影响尚不明确。将其中一个研究地点的Ba/Ca比率与底部水域测量的Ba浓度联系起来，显示地中海和affinis的分配系数分别为DBa = 0.34和DBa = 0.49。我们无法确定七个分析地点之间Ba/Ca比率与观测/模拟的相关环境因子梯度的趋势，例如初级生产力和相关的碳通量或TOC浓度。尽管在爱琴海这些地区的替代潜力有限，但我们认为，在初级生产力与海底营养分布之间的联系不那么复杂的情况下，有可能利用动物底栖生物物种的Ba/Ca来重建深海地区的出口生产力。

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Controls on barium incorporation into tests of benthic foraminifera from the Aegean Sea (Eastern Mediterranean Sea) – Towards a species-specific Ba/Ca calibration

We have analysed Ba/Ca ratios of live and dead benthic foraminifera (Uvigerina mediterranea and Melonis affinis) from core tops of seven sites located in the Aegean Sea by laser ablation ICP-MS. There are no significant Ba/Ca differences in live and dead specimens of U. mediterranea. For M. affinis we apply a threshold criterion for extremely high Ba/Ca in live specimens in order to highlight the overall uniform Ba/Ca signal. The Ba/Ca intra-test variability varies between 16 and 24 % relative standard deviation per specimen. It is attributed to biomineralisation processes i.e., vital effects. The Ba/Ca ratios of M. affinis are significantly higher than those of U. mediterranea throughout most of the sites and their respective samples from different sediment depths. The influence on Ba/Ca of both species by biomineralisation processes and/or microhabitat effects remains open. Linking the Ba/Ca ratios to measured Ba concentration of bottom waters from one of the studied sites, shows partition coefficients of D_Ba = 0.34, and D_Ba = 0.49 for U. mediterranea and M. affinis, respectively. We could not identify trends of Ba/Ca ratios to observed/ modelled gradients of relevant environmental factors between the seven analysed sites, such as primary productivity and associated C_org fluxes or TOC concentrations. Despite the demonstrated limited proxy potential in these parts of the Aegean Sea, we suggest that it is possible to employ Ba/Ca of infaunal benthic species in order to reconstruct export productivity in deep-sea areas with a less complex linkage between primary productivity and nutrient distribution in bottom waters.

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来源期刊

Marine Micropaleontology 地学-古生物学

CiteScore

3.70

自引率

15.80%

发文量

审稿时长

26.7 weeks

期刊介绍： Marine Micropaleontology is an international journal publishing original, innovative and significant scientific papers in all fields related to marine microfossils, including ecology and paleoecology, biology and paleobiology, paleoceanography and paleoclimatology, environmental monitoring, taphonomy, evolution and molecular phylogeny. The journal strongly encourages the publication of articles in which marine microfossils and/or their chemical composition are used to solve fundamental geological, environmental and biological problems. However, it does not publish purely stratigraphic or taxonomic papers. In Marine Micropaleontology, a special section is dedicated to short papers on new methods and protocols using marine microfossils. We solicit special issues on hot topics in marine micropaleontology and review articles on timely subjects.