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首页> 外文期刊>Estuarine Coastal and Shelf Science >Estuarine foraminiferal biofacies pattern compared to the brackish ichnofacies model: Port Stephens, southeast Australia
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Estuarine foraminiferal biofacies pattern compared to the brackish ichnofacies model: Port Stephens, southeast Australia

机译：河口有孔虫生物相模式与微咸鱼眼相模型比较：澳大利亚东南部斯蒂芬斯港

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摘要

Port Stephens, located in SE Australia, is a shallow estuary with an outer and inner basin separated by a narrow channel. Foraminiferal biofacies distribution reveals this complex physical environment. The flood-tide delta forms a transition between the wave-dominated open coast and the microtide-dominated estuary. Sand wave dynamics cause a shifting substrate, resulting in allochthonous assemblages of calcareous shelf species transported into the bay through a wide entrance. The muddy central basin is heavily bioturbated, and allows for an in-situ, mixed calcareous and agglutinated assemblage of a progressively more estuarine character. Burial of organic matter and increased bioturbation permits infaunal species to increase in abundance, but promotes calcium carbonate dissolution. The bayhead delta of the Karuah River is characterized by lithic-rich substrates that are associated with robust calcareous species. Tidal cycles, combined with low river-flux, provide nearly fully marine conditions far upstream into the Karuah River. Marginal regions, from sandy/muddy tidal flats to marsh, show distinct assemblages of opportunistic species that respond to tidal exposure, substrate variations, organic matter flux and salinities. Early diagenetic taphonomic loss, closely linked with bioturbation, needs to be considered in interpretations of microfossil assemblages. Foraminiferal biofacies analysis, in combination with the brackish-water ichnology model, is a powerful tool for recognizing Mesozoic marginal marine environments. Port Stephens, with its environmental complexity, offers a valuable modern analogue for estuarine deposits of the geological past.
机译：史蒂芬斯港（Port Stephens）位于澳大利亚东南部（SE Australia），是一个浅河口，其外部和内部盆地被狭窄的通道隔开。有孔虫生物相分布揭示了这种复杂的物理环境。潮汐三角洲在以波浪为主的开阔海岸和以微潮为主的河口之间形成过渡。沙波动力学导致基底移动，从而导致钙质架子物种的异源组合通过宽阔的入口运入海湾。浑浊的中央盆地严重受生物扰动，使得原位，钙质和凝结混合的组合逐渐具有更多的河口特征。埋葬有机物和增加生物扰动允许不育物种增加丰度，但促进碳酸钙溶解。卡鲁阿河的湾区三角洲的特征是富含钙质的底物，与坚固的钙质物种有关。潮汐加之河流通量较低，使得远至Karuah河上游的海洋条件几乎完全满足。从沙质/泥泞的潮滩到沼泽，边缘地区显示出各种机会主义物种，这些物种对潮汐暴露，基质变化，有机质通量和盐度有响应。与生物扰动密切相关的早期成岩垂体丧失需要在微化石组合的解释中加以考虑。有孔虫生物相分析与微咸水鱼类学模型相结合，是识别中生代边缘海洋环境的有力工具。史蒂芬斯港，由于其环境复杂性，为过去的河口沉积物提供了有价值的现代模拟物。

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