ISOTOPIC (Sr, O, C) INDICATORS OF SALINITY AND TAPHONOMY IN MARGINAL MARINE SYSTEMS
ISOTOPIC (Sr, O, C) INDICATORS OF SALINITY AND TAPHONOMY IN MARGINAL MARINE SYSTEMS
复制标题
边缘海洋系统中盐度和埋藏学的同位素（Sr、O、C）指标
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Schwarcz
中科院分区：
文献类型：
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作者：
E. Reinhardt;R. Fitton;H. Schwarcz
10个沉积物样品从克罗埃西亚河（Nahal Tanninim），以色列，进行了有孔虫丰度和4个样品进行了选择O，C和Sr同位素分析，以研究盐度和埋藏趋势。记录了两种生物相：Ammonia tepida（59±20%（1σ））和Pararotalia spinigera（75±17%（1σ））。δ 18 O、δ 13 C和87 Sr/ 86 Sr值在贝壳材料（有孔虫、介形虫、软体动物、藻类）中的分布记录了开放式微潮河口内的盐度趋势，其确定性大于单独的古生物学分析。同位素数据允许隔离埋藏的趋势，确定哪些分类群是从原来的背景下。计算的盐度从四个样本从Croatian河的分布是双峰与两组拟合成海洋或非常咸的盐度制度。大多数类群遵循这一趋势，从贝壳材料中的87 Sr/ 86 Sr值测量的盐度表明相对稳定的盐度为30‰。死亡组合中的标本的混合物，从这样不同的盐度制度表明运输既向陆地和向海在河口。这种方法显示出作为微咸系统的环境指标时，重复采样和分析活标本不能进行的承诺。
Ten sediment samples from the Crocodile River (Nahal Tanninim), Israel, were analyzed for their foraminiferal abundance and four samples were selected for O, C and Sr isotopic analysis to examine salinity and taphonomic trends. Two biofacies were documented: a Ammonia tepida (59±20% (1σ)) and a Pararotalia spinigera (75±17% (1σ)) dominated assemblage. The distribution of δ 18 O, δ 13 C and 87 Sr/ 86 Sr values within shell material (foraminifera, ostracods, mollusks, algae) documented salinity trends within the open-ended, micro-tidal estuary with greater certainty than paleontological analysis alone. The isotopic data allowed the isolation of taphonomic trends by determining which taxa were transported from their original context. The calculated salinities from the four samples from the Crocodile River had a distribution that was bimodal with the two groups fitting into a marine or very brackish salinity regime. Most of the taxa followed this trend with measured salinities from the 87 Sr/ 86 Sr values in the shell material indicating a relatively stable salinity of 30‰. The mixture of specimens in the death assemblage from such diverse salinity regimes indicated transport both landward and seaward in the estuary. This methodology shows promise as an environmental indicator in brackish systems when replicate sampling and the analysis of live specimens cannot be undertaken.