古岩溶洞穴中残留的次生方解石晶体可以作为裂变径迹测年的材料。通过测定遍及青藏高原的 2 0组洞穴次生方解石晶体的裂变径迹年代 ,结果表明 ,晚第三纪青藏高原的古岩溶过程和缓慢构造抬升过程相伴进行 ,其间在大约 10 Ma B.P.、12 Ma B.P.和 19Ma B.P.时洞穴次生化学沉积较为发育。由于地表切割程度的差异 ,晚第三纪岩溶过程在高原南部较为强烈 ,相对于第四纪期间的强烈抬升来说 ,高原晚第三纪的抬升速率较为缓慢 ,两者的差别达两个数量级。 Secondary calcite crystals remaining in paleokarst caves can be used as the dating data for fission track. The results show that the palaeokarst process of the Late Tertiary Qinghai-Tibet Plateau and the slow tectonic uplift process are accompanied by the fission track dating of secondary calcite crystals in 20 caves throughout the Qinghai-Tibet Plateau. During the period of about 10 Ma BP, 12 Ma Secondary chemical deposition of caves in BP and 19Ma BP developed. Due to the difference in the degree of surface cutting, the Late Tertiary karstification process was more intense in the southern plateau. Compared with the intense uplift in the Quaternary period, the uplift rate of the Late Tertiary in the plateau was relatively slow, and the difference between them was two orders of magnitude .