Abstract In this study we examine the distribution patterns of modern palynological assemblages from different salt marsh zones and microenvironments in order to generate reference data for the north-central sector of Bahia Samborombon, to be used as analogues for interpreting fossil palynological assemblages. For the modern palynological analysis, 23 surface sediment samples were taken from different tidal environments in the coastal zone, including intertidal, low, middle and high salt marsh. The results allowed to differentiate and characterize the tidal environments from the palynological point of view. Small changes in the microrelief such as tidal channels, cheniers, and depressions areas, modify the local vegetation and therefore determine the final palynological assemblage. Fossil data from the central zone of Bahia Samborombon (PM 1 stratigraphic sequence) was compared with the modern pollen data to interpret vegetation and paleoenvironmental changes; which demonstrated that salinity, mainly related to the tidal influence, drove the paleoenvironmental changes. This study provides new modern palynological data for Bahia Samborombon and may constitute an important tool to interpret Holocene fossil sediment sequences. This data could be used in future paleonvironmental reconstructions in coastal plain deposits whose evolution are linked to relative sea-level fluctuations.

中文翻译：

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盐沼孢粉组合作为解释阿根廷东北沿海平原过去植被区和环境条件的现代模拟工具

摘要 在这项研究中，我们研究了来自不同盐沼区和微环境的现代孢粉组合的分布模式，以便为 Bahia Samborombon 中北部地区生成参考数据，用作解释化石孢粉组合的类似物。对于现代孢粉学分析，从沿海地区的不同潮汐环境中采集了 23 个表层沉积物样本，包括潮间带、低、中和高盐沼泽。结果允许从孢粉学的角度区分和表征潮汐环境。潮汐通道、雪尼尔和洼地等微地形的微小变化会改变当地的植被，从而决定最终的孢粉组合。将 Bahia Samboombon 中心带的化石数据（PM 1 地层序列）与现代花粉数据进行比较，以解释植被和古环境变化；这表明主要与潮汐影响有关的盐度驱动了古环境变化。这项研究为 Bahia Samborombon 提供了新的现代孢粉学数据，并可能构成解释全新世化石沉积序列的重要工具。这些数据可用于未来沿海平原沉积物的古环境重建，其演化与相对海平面波动有关。这项研究为 Bahia Samborombon 提供了新的现代孢粉学数据，并可能构成解释全新世化石沉积序列的重要工具。这些数据可用于未来沿海平原沉积物的古环境重建，其演化与相对海平面波动有关。这项研究为 Bahia Samborombon 提供了新的现代孢粉学数据，并可能构成解释全新世化石沉积序列的重要工具。这些数据可用于未来沿海平原沉积物的古环境重建，其演化与相对海平面波动有关。