The Nördlinger Ries Crater lacustrine basin (South-West Germany), formed by a meteorite impact in the Miocene (Langhian; ∼14.9 Ma), offers a well-established geological framework to understand the strengths and limitations of U-Pb LA-ICPMS (in situ Laser Ablation-Inductively Coupled Plasma Mass Spectrometry) geochronology as chronostratigraphic tool for lacustrine (and more broadly continental) carbonates. The post-impact deposits include siliciclastic basinal facies at the lake centre and carbonate facies at the lake margins, coevally deposited in a time window of >1.2 and <2 Ma. Depositional and diagenetic carbonate phases (micrites and calcite cements) were investigated from three marginal carbonate facies (Hainsfarth bioherm, Adlersberg bioherm and Wallerstein mound). Petrography combined with C and O stable isotope analyses indicate that most depositional and early diagenetic carbonates preserved pristine geochemical compositions and thus the U-Pb system should reflect the timing of original precipitation. In total, 22 U-Pb ages were obtained on 10 different carbonate phases from five samples. The reproducibility and accuracy of the U-Pb (LA-ICPMS) method were estimated to be down to 1.5% based on repeated analyses of a secondary standard (speleothem calcite ASH-15d) and propagated to the obtained ages. Micrites from the Hainsfarth, Adlersberg and Wallerstein facies yielded ages of 13.90 ± 0.25, 14.14 ± 0.20 and 14.33 ± 0.27 Ma, respectively, which overlap within uncertainties, and are consistent with the weighted average age of 14.30 ± 0.20 Ma obtained from all the preserved depositional and early diagenetic phases. Data indicate that sedimentation started shortly after the impact and persisted for >1.2 and <2 Ma, in agreement with previous constraints from literature, therefore validating the accuracy of the applied method. Later calcite cements were dated at 13.2 ± 1.1 ($n_{\mathrm{w}}=2$), 10.2 ± 2.7 and 9.51 ± 0.77 Ma, implying multiple post-depositional fluid events. This study demonstrates the great potential of the U-Pb method for chronostratigraphy in continental systems, where correlations between time-equivalent lateral facies are often out of reach. In Miocene deposits the method yields a time resolution within the 3rd order depositional sequences (0.5–5 Ma).

Nördlinger Ries Crater 湖泊盆地（德国西南部）由陨石撞击中新世（Langhian；~14.9 Ma）形成，提供了一个完善的地质框架来了解 U-Pb LA-ICPMS 的优势和局限性（就地激光烧蚀-电感耦合等离子体质谱）地质年代学作为湖泊（以及更广泛的大陆）碳酸盐岩的年代地层工具。撞击后沉积包括湖心的硅质碎屑盆地相和湖缘的碳酸盐岩相，共沉积时间窗>1.2 和<2 Ma。研究了三个边缘碳酸盐岩相（Hainsfarth bioherm、Adlersberg bioherm 和 Wallerstein 丘）的沉积和成岩碳酸盐相（泥晶石和方解石胶结物）。岩相学结合 C 和 O 稳定同位素分析表明，大多数沉积和早期成岩碳酸盐保留了原始地球化学成分，因此 U-Pb 系统应反映原始降水的时间。总共，从五个样品的 10 个不同碳酸盐相上获得了 22 个 U-Pb 年龄。U-Pb (LA-ICPMS) 方法的重现性和准确性根据二级标准（speleothem calcite ASH-15d）的重复分析估计低至 1.5%，并传播到获得的年龄。来自 Hainsfarth、Adlersberg 和 Wallerstein 相的泥晶岩的年龄分别为 13.90 ± 0.25、14.14 ± 0.20 和 14.33 ± 0.27 Ma，在不确定性范围内重叠，并且与从所有保存下来的所有保存的 Ma 中获得的加权平均年龄 14.30 ± 0.20 Ma 一致沉积和早期成岩阶段。数据表明，在撞击后不久开始沉积，并持续 >1.2 和 <2 Ma，与之前文献中的限制一致，因此验证了所应用方法的准确性。$n_{\mathrm{瓦}}=2$)、10.2 ± 2.7 和 9.51 ± 0.77 Ma，这意味着多个沉积后流体事件。这项研究证明了 U-Pb 方法在大陆系统年代地层学方面的巨大潜力，在大陆系统中，时间等效的侧相之间的相关性通常是遥不可及的。在中新世沉积中，该方法在三阶沉积序列（0.5-5 Ma）内产生时间分辨率。