Figure 1

Comprehensive geological figure of the study area in the Sichuan Basin (modified from reference7). (a) Tectonic units of the Sichuan Basin and the location of the study area. (b) Strata column of Da’anzhai member in the study area.

Comprehensive geological figure of the study area in the Sichuan Basin (modified from reference7). (a) Tectonic units of the Sichuan Basin and the location of the study area. (b) Strata column of Da’anzhai member in the study area.