Abstract:

The temporal and spatial variations of sub-structural units in the southern slope of Tabei uplift were analyzed by using balanced section technology, and then the control of differential evolution on ancient karstification, especially on epigenic karstification was discussed combined with the analysis of Cambrian-Ordovician unconformity types. The result indicated that Yingmaili uplift and Halahatang sag were being formed in the early episode of Middle Caledonian period and formed in Late Yanshanian period corresponding to the early episode of Middle Caledonian-Middle Yanshanian karstification, which has the characteristics of long duration, strong dissolution and erosion. Akekule uplift and Caohu sag were being formed in the episode Ⅰ of Middle Caledonian period and formed in Indosinian period corresponding to the early episode of Middle Caledonian-Late Hercynian karstification, which has the characteristics of moderate exposure and good condition for karst formation and conservation. Halahatang sag was being formed in the episode Ⅰ of Middle Caledonian period and formed in Late Hercynian period corresponding to the  episode I and episode Ⅲ of Middle Caledonian karstification, which has the characteristics of relatively weak erosional dissolution.

Key words: southern slope of Tabei uplift, tectonic uplift, temporal and spatial variation, exposing erosion, karst development feature