Through the analysis of vitrinite reflectance

inclusion and apatite fission track

paleogeotemperature and paleogeothermal gradient obtained in Late Mesozoic of Qinshui Basin show well coincidence with each other.The paleogeothermal gradient of Qincan-1 well is between 4.73℃/100 m～6.10℃/100 m

its paleoheat flow is 82 mW/m

2

～106 mW/m

2

.This is evidently related to tectonic thermal event.In horizental

the distribution of R

o

value coincides with the configuration of the basin in Late Mesozoic

and the high R

o

value distribution region was related to magmatic activity.The isotopic age of the rock bodies is between 95.34 Ma～166.45 Ma

and the highest abundent of that in the peripheral magmatic active zones is 124 Ma～153 Ma.It suggests that the tectonic thermal event happened in Late Jurassic-Early Cretaceous

and that the event was the reflection of mid Yenshan movement.