The Yalahau region, located in the northeastern portion of the Yucatan Peninsula, hosts a series of elongated depressions trending north/south in the direction of Isla Holbox, identified as the Holbox Fracture Zone. Previous studies have explored the geomorphology and various hydrologic characteristics of the Yucatan Peninsula; however, there is a paucity of data concerning the interior region where the fractures are located. Strontium isotope ratios and major ion geochemistry data of the surface water and groundwater of this region serve as a hydrogeochemical fingerprint, aiding in constraining the hydrological boundaries, determining flow paths, and characterizing hydrogeochemical processes that impact the composition of the groundwater within the region. 87Sr/86Sr isotope ratios indicate a different signature than the surrounding bedrock Sr ratio, suggesting that the flow throughout the Yalahau region is moving through channels faster than that of much of the Yucatan. Through major ion geochemistry and 87Sr/86Sr isotope ratios, we were able to delineate at least two flow paths within the Yalahau region and identify a point of saline intrusion at least 35 km from the coast. Gaining an understanding of the hydrogeochemistry and water flow regions is crucial in determining the impact of various activities (e.g., extensive tourism, drinking water withdrawal, wastewater discharge/injection) that occur within the Yucatan Peninsula.

中文翻译：

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使用地球化学和 87Sr/86Sr 同位素比表征墨西哥尤卡坦半岛亚拉豪地区的流动路径

亚拉豪地区位于尤卡坦半岛的东北部，拥有一系列向北/南向霍尔博克斯岛方向延伸的细长洼地，被确定为霍尔博克斯断裂带。以往的研究探索了尤卡坦半岛的地貌和各种水文特征；然而，关于裂缝所在的内部区域的数据很少。该地区地表水和地下水的锶同位素比和主要离子地球化学数据可作为水文地球化学指纹，有助于限制水文边界、确定流动路径和表征影响该地区地下水组成的水文地球化学过程。87Sr/86Sr 同位素比率表明与周围基岩 Sr 比率不同的特征，这表明整个亚拉豪地区的水流通过通道的速度比尤卡坦半岛的大部分地区快。通过主要离子地球化学和 87Sr/86Sr 同位素比，我们能够描绘出亚拉豪地区内至少两条流动路径，并确定距离海岸至少 35 公里的盐水入侵点。了解水文地球化学和水流区域对于确定尤卡坦半岛内发生的各种活动（例如，广泛的旅游、饮用水抽取、废水排放/注入）的影响至关重要。通过主要离子地球化学和 87Sr/86Sr 同位素比，我们能够描绘出亚拉豪地区内至少两条流动路径，并确定距离海岸至少 35 公里的盐水入侵点。了解水文地球化学和水流区域对于确定尤卡坦半岛内发生的各种活动（例如，广泛的旅游、饮用水抽取、废水排放/注入）的影响至关重要。通过主要离子地球化学和 87Sr/86Sr 同位素比，我们能够描绘出亚拉豪地区内至少两条流动路径，并确定距离海岸至少 35 公里的盐水入侵点。了解水文地球化学和水流区域对于确定尤卡坦半岛内发生的各种活动（例如，广泛的旅游、饮用水抽取、废水排放/注入）的影响至关重要。