中中新世气候适宜期(ca.15~17Ma)是新生代气候变冷背景下的一次短期气候温暖事件.由于缺乏陆相记录,目前对于该事件的研究多来自于海洋钻孔.本文对云南东南部的文山盆地湖相地层开展了高分辨率的古地磁定年(剖面厚约270 m)和地球化学研究(剖面厚约400 m).古地磁结果显示文山剖面上段约145 m为负极性,下段约125 m为正极性.参考邻近区域中新世湖相地层的沉积速率特征,我们推测这270 m厚的剖面沉积时间跨度至 The Mid-Miocene climatic suitable period (ca.15 ~ 17Ma) is a short-term climate warm event under the Cenozoic climate change. Due to the lack of terrestrial records, the current research on this event mostly comes from marine drilling. High-resolution palaeomagnetic dating (about 270 m in thickness) and geochemical studies (with a section thickness of about 400 m) have been carried out in the lacustrine strata of Wenshan Basin in southeastern Yunnan. The paleomagnetic results show that about 145 m of the upper Wenshan section is negative , And the lower part of about 125 m is positive.Referring to the sedimentary rate characteristics of the Xikou lacustrine strata in the adjacent area, we speculate that the 270-m-thick section has a deposition time span of