详文请见地质学报, 2008,82(8)：

利用古成熟度方程初步恢复济阳坳陷晚三叠世印支运动剥蚀量

陈中红等

与新生界镜质组反射率( Ro ) 值比较,济阳坳陷晚古生界Ro 值整体上出现了显著的异常,通过对济阳坳陷大量的晚古生界Ro异常数据点与新生界Ro数据点的分析、比较,建立了济阳坳陷新生界成熟度方程( Ro-H方程) 和晚古生界古成熟度方程,利用这些古成熟度方程,对济阳坳陷Mz/ Pz 间断面剥蚀量进行了初步恢复,研究结果表明东营凹陷、沾化凹陷、车镇凹陷Pz/ Mz 间断面剥蚀量分别达311～411 km、210～411 km、311～411 km 左右,平均在315 km 左右,佐证了华北地台在印支运动开始前是个统一的大型沉积盆地,济阳坳陷部分晚古生界煤系地层在晚三叠世初期之前已经开始热解生烃。

关键词: 镜质组反射率;成熟度方程;晚古生代;剥蚀量;济阳坳陷

Restoration of the Thickness Eroded during the Late Triassic Indo-Chinese Tectonic Movement in the Jiyang Depression by Using the Paleo-Maturity-Equation

CHEN Zhonghong

Abstract

Comparative to t he vit rinite reflectance (Ro) of t he Cenozoic , the value of Ro from t he Upper Paleozoic displays distinct anomaly. Based on the analysis and comparison of a number of Ro data, t his study established mat urity equations ( Ro- H) of the

Jiyang depression of both t he Cenozoic and t he Upper Paleozoic, through which t he eroded thickness of t he discontinuity surface between t he Mesozoic and the Paleozoic in t he J iyang depression was restored. The result revealed t hat t he eroded thickness of the discontinuity surface in the Dongying Sag , Zhanhua Sag and Chezhen Sag are 3.1～4.1 km , 2. 0～4. 1 km and 3.1～4. 1 km, respectively, averaging 3. 5 km. This fully suggest s t hat t he North China Plate was a unified large-scale sedimentary basin before the Indo-Chinese movement , and part of late-Paleozoic coal-bearing strata started to produce hydrocarbon by means of thermolysis.

Key words : vit rinite reflectance ( Ro ) ; mat urity equation ; the Upper Paleozoic ; eroded thickness ; Jiyang depression

Chen Zhonghong,et al. Restoration of the Thickness Eroded during the Late Triassic Indo-Chinese Tectonic Movement in the Jiyang Depression by Using the Paleo-Maturity-Equation. Acta Geologica Sinica,2008,82(8). (in Chinese)

 

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