福建三明万寿岩地区中更新世晚期以来地壳多期隆升特征及地质意义

为研究福建三明万寿岩地区的新构造运动特征,本次研究以区内两级层状洞穴和两级河流阶地为研究对象,通过对洞穴和阶地的详细剖面测量,结合洞穴和阶地的年龄,认为万寿岩地区从中更新世晚期以来至少经历了四次隆升:262 ka前为第一隆升期,185~37 ka为第二隆升期,37~17.4 ka为第三隆升期,10.4 ka以来为第四隆升期。其中前两次间歇期分别形成灵峰洞和船帆洞,后两次隆升期分别形成鱼塘溪的二级阶地和一级阶地。262 ka以来隆升速率的计算结果显示,万寿岩地区各时期隆升速率相差较大,但总体活动强度较弱。万寿岩地区间歇性隆升与福建东部沿海地区地壳沉降形成鲜明反差,表明福建境内的新构造运动具有差异性升降特征。

Characteristics of multi-stage crustal uplifting since the late Middle Pleistocene in the Wanshouyan area of Sanming, Fujian Province and their and geological implications

This work aims to study the characteristics of the neotectonic movement in the Wanshouyan area of Sanming in Fujian Province. Taken the two stages of layered caves and two stages of river terraces in the study area as examples, this work conducted detailed profile measurement on the caves and terraces. Integrated with the ages of the caves and terraces, it is suggested that the Wanshouyan area has undergone at least four phases of uplifting since the late Middle Pleistocene. The first phase is before 262 ka; the second phase is 185~37 ka; the third phase is 17.4~12 ka, and the fourth phase is 10.4 ka to the present. The former two interuplifting phase formed the Lingfeng cave and Chuanfan cave, respectively, and the latter two uplifting phases formed the second stage terrace and the first stage terrace in Yuxitang. The calculation results of the uplifting rate since 262 ka show that the uplifting rate is relatively different in various phases in the Wanshouyan area, but the overall activity intensity is weak. The clear difference between the intermittent uplifting in Wanshouyan and the crustal subsidence in the coastal area of eastern Fujian Province indicates that the neotectonic movement in Fujian has characteristics of differential uplifting.