山东及皖北上侏罗统及与邻区对比的大地构造意义

Tectonic significance of stratigraphic correlation between Upper Jurassic in Shandong/north Anhui & adjacent areas

任凤楼 柳忠泉 姜慧超 张交东

Ren Fenglou Lui Zhongquan Jiang Huichao Zhang Jiaodong

中国石油化工股份有限公司胜利油田分公司地质科学研究院, 山东东营 257015

Geological Scientific Research Institute of SINOPEC Shengli Oilfield Company, Dongying 257015

通过对研究区中生代地层典型剖面或代表性剖面系统考察和综合研究,对上侏罗统及其上覆、下伏岩石地层进行进一步系统清理和修订:(1)将济阳坳陷原上侏罗统蒙阴组划归下白垩统,与之相对应的是鲁西南地区为杨家庄组;将山东地区中-上侏罗统三台组界定为中侏罗统;(2)将皖北地区合肥盆地圆筒山组划入中-上侏罗统;原上侏罗统周公山组认为是跨时代地层单元(J3K1)。(3)大别山北麓北淮阳六安、金寨地区的凤凰台组、三尖铺组定为晚侏罗世早期。在此基础上建立了中国东部地区准确可行的地层对比关系,提出了与国际接轨的地层划分与对比表。对比结果表明中国东部晚侏罗世除了在南北缘存在沉积外,整个地区缺失上侏罗统。该现象表明中国东部在晚侏罗世仍为挤压应力环境甚至比早中侏罗世更为强烈,甚至一直维持到早白垩世初。

Based on study of typical stratigraphic sections & well core in Mesozoic of Shandong & north Anhui areas, systematic study revision have been done on the Upper Jurassic and its underlying as well as overlying strata. Through this study, Mengyin Formation has been divided into the Lower Cretaceous, Corresponding to Yangjiazhuang Formation in southwest of Shandong area, Santai Formation has been divided into the Middle Jurassic, not in Late;and Zhougongshan Formation of Hefei basin (north Anhui) has been divided into the Late Jurassic to Early Cretaceous, Yuantongshan Formation in Middle-upper Jurassic.Fenghuangtai & Sanjianpu Formation at the north edge of Dabieshan has been divided into early phase of Late Jurassic.Based on this study, accurate and feasible stratigraphic correlation has been established.The correlation results indicate that Late Jurassic is absent in Huabei and Ludong areas, even to beginning of Cretaceous, because compress stress has dominated in the region since Yinzhi movement, and continued to the Early Cretaceous.

https://doi.org/10.3969/j.issn.1008-2336.2010.02.028