Abstract A buried travertine deposit, identified in a well at Prima Porta (to the north west of Rome, Italy), was investigated using a multidisciplinary approach that included stable isotope geochemistry, mineralogy, petrography and radiometric dating. The travertine body is located just along the western boundary of the Tiber valley, a morpho-tectonic depression of extensional origin; it is associated with the rise of a deep-seated, hypothermal, saline, CO2-rich fluid. The depositional environment was inferred by the macroscopic features of core and microfacies analysis, which suggested that travertine deposition was associated with a low to moderate energy environment, such as gently-dipping, shallow pools on low-angle, terraced slopes. A hydrothermal system, characterised by long circulation paths at depth, and deeply derived CO2-dominated fluids, are supported by geochemical analyses. According to radiometric dating, travertine deposition occurred from between 53.5 ± 10 ka to 24.2 ± 4.7 ka; the activation of the travertine-depositing spring was probably coeval with the wettest climatic conditions occurring during MIS3, whereas the end of deposition coincides with the cold and arid phase of the last glacial maximum.

中文翻译：

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Prima Porta（意大利中部）埋藏石灰华体的多学科表征

摘要 在 Prima Porta（意大利罗马西北部）的一口井中发现了一个埋藏的石灰华矿床，使用包括稳定同位素地球化学、矿物学、岩石学和放射性测年在内的多学科方法进行了调查。石灰华体正好位于台伯河谷的西部边界，这是一个伸展起源的形态构造凹陷；它与深层、低温、含盐、富含二氧化碳的流体的上升有关。沉积环境是通过岩心和微相分析的宏观特征推断出来的，这表明钙华沉积与低至中等能量环境有关，例如低角度梯田斜坡上的缓倾浅池。以深部长循环路径为特征的热液系统，和深层衍生的以 CO2 为主的流体，得到地球化学分析的支持。根据放射性测年，钙华沉积发生在 53.5±10 ka 到 24.2±4.7 ka 之间；石灰华沉积泉的激活可能与 MIS3 期间发生的最潮湿的气候条件同时发生，而沉积的结束与最后一次冰期最大值的寒冷和干旱阶段相吻合。