The research aims to reconstruct the chronology of building the Southwest Church, Umm el-Jimal, Jordan by AMS radiocarbon dating organic inclusions uncovered from the mortars collected from the floor of the church, seat of the apse and the base of the north wall. It sheds light on the major aspects of mortar recipes at the time of their production. Samples were examined macroscopically with magnifying lenses and characterized using archaeometric techniques of optical microscopy and X-ray diffraction. The radiocarbon dates showed that 594–643 AD is the most probable age for flooring and plastering the church and 995–1154 AD is the earliest possible date for its final collapse. The preparatory layers of the church floor were laid on an older one, probably of a yard, and its north wall was raised on an older base, both most probably date to the late fifth–early sixth century AD. The production recipe of the mortars is made from a lime binder and inclusions mainly of organic (charcoal) and inorganic (quartz, grog, volcanics). The mortars have the same recipe regardless their bedding and jointing functions which remained unchanged during the building stages of church complex.

该研究旨在通过 AMS 放射性碳测年技术，从教堂地板、后殿座位和北墙底部收集的灰浆中发现有机内含物，重建约旦乌姆吉马尔西南教堂的建筑年代。它揭示了砂浆配方在生产时的主要方面。使用放大镜对样品进行宏观检查，并使用光学显微镜和 X 射线衍射的考古技术进行表征。放射性碳年代测定显示，公元 594-643 年是教堂铺设地板和抹灰的最可能年代，而公元 995-1154 年是教堂最终倒塌的最早可能年代。教堂地板的准备层铺设在一个较旧的地板上，可能是一个院子，而其北墙则建在一个较旧的基座上，两者都很可能可以追溯到公元五世纪末至六世纪初。砂浆的生产配方由石灰粘合剂和主要由有机物（木炭）和无机物（石英、熟料、火山岩）组成的内含物制成。砂浆的配方相同，无论其垫层和接缝功能如何，在教堂建筑群的建造阶段都保持不变。