Oil & Gas Geology ›› 1999, Vol. 20 ›› Issue (1): 46-48.doi: 10.11743/ogg19990110

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TECTONIC THERMAL EVENTS OF LATE MESOZOIC IN QINSHUI BASIN

Ren Zhanli1, Zhao Zhongyuan1, Chen Gang1, Wang Shicheng2   

  1. 1. Department of Geology, Northwest University, Xi'an, Shaanxi;
    2. Institute of High Energy Physics, Academia Sinica, Beijing
  • Received:1998-10-22 Online:1999-03-25 Published:2012-01-18

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Abstract:

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/m2～106 mW/m2.This is evidently related to tectonic thermal event.In horizental,the distribution of Ro value coincides with the configuration of the basin in Late Mesozoic,and the high Ro 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.

Key words: Qinshui Basin, paleogeothermal gradient, fission track, tectonic thermal event