Despite recent advances in wetland studies, ancient wetland deposits are still not well documented, and their facies characteristics are poorly registered. Sedimentary facies and sequence stratigraphic analysis of the Miocene Yecua Formation (Chaco foreland basin, Central Andes, Bolivia) and their comparison to Pantanal‐like modern wetlands provide an insight into their variability, suggesting a facies model for large inland wetlands that developed in a tropical–subtropical climate. Sedimentological features show that clastic, chemical and biological processes in these environments lead to distinguishable lithofacies variations. Six architectural elements are described: (i) muddy sublittoral (FA1); (ii) mixed siliciclastic–carbonate shoreface (FA2); (iii) sand‐flat (FA3) and (iv) mud‐flat (FA4) deposits; (iv) floodplain (FA5); and (vi) simple channel deposits (FA6). The succession is composed of shallowing‐upward parasequences with different facies characteristics caused by climatically‐driven changes of the water level over three orders of magnitude and cyclicity. These cyclic changes reflect a climatic control on the sedimentation. A palaeoclimatic interpretation suggests a generally warm, humid climate with marked rainfall regime changes. The aim of this article is to use this dataset to improve the understanding of depositional elements, lithologies and stratigraphy in tropical–subtropical large inland wetlands. The proposed criteria will help in recognizing inland wetland deposits in other sedimentary basins.

中文翻译：

---

潘塔纳尔式内陆湿地沉积记录的相模型

尽管最近在湿地研究方面取得了进展，但古代湿地沉积物仍未得到很好的记录，其相特征也记录得很差。中新世Yucua组（玻利维亚中部安哥斯中部查科前陆盆地）的沉积相和层序地层分析及其与潘塔纳尔式现代湿地的比较提供了对其变异性的见解，表明了在热带地区发育的大型内陆湿地的相模型–亚热带气候。沉积学特征表明，在这些环境中的碎屑，化学和生物过程导致明显的岩相变化。描述了六个建筑元素：（i）泥泞的近岸（FA1）；（ii）硅质碎屑碳酸盐岩混合面（FA2）；（iii）砂型（FA3）和（iv）滩涂（FA4）沉积物；（iv）洪泛区（FA5）；（vi）简单通道沉积物（FA6）。演替过程是由气候驱动的水位在三个数量级和周期性上的变化引起的，具有不同相相特征的浅层向上副层序组成。这些周期性变化反映了对沉积物的气候控制。古气候的解释表明，总体上温暖潮湿的气候伴随着明显的降雨变化。本文的目的是使用该数据集来增进对热带—亚热带大内陆湿地中沉积元素，岩性和地层学的理解。拟议的标准将有助于识别其他沉积盆地的内陆湿地沉积物。