During the Late Paleozoic to Cenozoic, with the closure of the Tethys oceans, the East and/or Southeast Asia was amalgamated by individual blocks. In order to understand the Paleogeography of the Eastern Paleo-Tethys, a systematic UPb dating on 11 samples have conducted to constrain the age and provenance of the elements forming the Ailaoshan-Song Ma mélange. These samples consist of the ophiolitic mélange zone (6 samples), the sedimentary cover of the Indochina block (4 samples), and the post-orogenic continental deposits (1 samples). The achieved detrital zircon age distribution, and the corresponding in-situ Hf isotopic recorder allow us to discuss the provenances of the materials involved in the tectonic processes during the subduction and collision. Three units (M1, M2, M3), which stand for the different segment of the suture zone, could be separated based on the differences in zircon age clusters and Hf isotopic values. These differences might be due to the variety of provenances. Combined with the previous works, especially our work on the Song Chay mélange zone, we concluded that both upper and lower plates are potential provenances for the mélanges between South China block and Indochina block. Along the suture zone, the component of the mélange presents a significant heterogeneity.

在晚古生代到新生代期间，随着特提斯洋的闭合，东亚和/或东南亚被单个地块合并。为了了解东古特提斯的古地理，系统地U对11个样品进行了铅测年，以限制形成哀牢山-宋马混杂岩的元素的年龄和来源。这些样品包括蛇绿混杂岩带（6 个样品）、印度支那地块的沉积盖层（4 个样品）和造山后大陆沉积物（1 个样品）。获得的碎屑锆石年龄分布和相应的原位 Hf 同位素记录器使我们能够讨论在俯冲和碰撞期间参与构造过程的材料的来源。根据锆石年龄簇和Hf同位素值的差异，可以分离出三个单元（M1、M2、M3），代表缝合带的不同部分。这些差异可能是由于出处的多样性。结合之前的作品，尤其是我们在宋茶混色区的作品，我们得出结论，上下板块都是华南地块和印度支那地块之间混杂岩的潜在物​​源。沿着缝合带，混色的成分呈现出显着的异质性。