Taphonomy of larger foraminifera: Relationships between living individuals and empty tests on flat reef slopes (Sesoko Island, Japan)
Taphonomy of larger foraminifera: Relationships between living individuals and empty tests on flat reef slopes (Sesoko Island, Japan)
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较大有孔虫的埋藏学：活体个体与平坦礁石斜坡上的空试验之间的关系（日本濑底岛）
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发表时间：
2002
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影响因子：
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通讯作者：
J. Hohenegger
中科院分区：
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作者：
Elza K. Yordanova;J. Hohenegger
摘要对西北太平洋边缘礁前礁区沿着两个样带的大型有孔虫（27种）的深度分布进行了调查。一个样带的特点是在陡峭的礁坡（−30 m）以下强烈的平坦化，而另一个样带的特征是相当部分的进一步陡峭化。根据最终沉积前不同的埋藏过程对有孔虫测试的影响，将空测试分为“保存最好”、“保存良好”和“保存较差”三类。每个保存状态的深度分布进行了比较与生活的个人。虽然最佳保存的测试分布几乎与活的个体一致，保存良好的测试的特点是显着的深度变化，在最高的斜坡比更深的部分更强。由于时间平均牵引力是相似的，在两个调查样带，分布的生活个人和保存完好的测试之间的差异更密集的陡峭与平坦的斜坡。保存不好的测试标志着异地起源或残余沉积物的改造。
SummaryThe depth distributions of larger foraminifera (27 species) were investigated along two transects in the fore reef areas of a NW Pacific fringing reef. One transect is distinguished by a strong flattening below the steep reef slope (−30 m), whereas further steepening characterizes the equivalent part in the other transect. According to the different taphonomic processes affecting foraminiferal tests before final sedimentation, empty tests were classified into the three categories ‘optimally’, ‘well’ and ‘poorly’ preserved. The depth distribution of each preservation state was compared with living individuals. While distributions of optimally preserved tests almost coincide with living individuals, well-preserved tests are characterized by significant depth shifts that are stronger at the upper-most slope compared with the deeper parts. Since the time-averaged traction forces are similar in both investigated transects, differences between the distributions of living individuals and well-preserved tests are more intensive on steep versus flat slopes. Poorly preserved tests signalize allochthonous origin or reworking of relict sediments.