泌阳凹陷南部陡坡带核三上亚段物源研究

Provenance Research on Upper Member of Eh_3 of Steep Slope Zone in the South of Biyang Depression

受南部北西向唐河-栗园断裂和东部北东向泌阳-栗园断裂的共同控制,泌阳凹陷南部陡坡带伴生构造类型较多,使得该区物源来源广泛,历来具有争议。结合前人研究成果,从碎屑岩矿物成熟度、重矿物含量、砂砾岩厚度及其百分含量等方面对泌阳凹陷南部陡坡带核三上亚段沉积时期的物源进行分析探讨。通过研究,提出了主、次要物源的判别依据——等值线朵体在平面展布范围的大小。在此基础上,结合上述几种资料所反映物源的一致性程度,认为研究区核三上亚段主要物源为古城、侯庄和平氏等3个物源区,次要物源为井楼-长桥、下二门、杨桥、桂岸及梨树凹等5个物源区。

Because of the common control by Tanghe-Liyuan NW fault in the south and Biyang-Liyuan NE fault in the east,there were multiple types of associated structures in the south Steep Slope of Biyang Depression,thus the provenance was widely spread,which was historically disputable. In combination with the result of predecessors' research,from the aspects of mineral maturity of clastic rocks,content of heavy mineral,thickness of glutenite and their percent content,the provenance of the upper member of Eh3 of steep slope zone in southern Biyang Depression was analyzed. Though researches,the criterion for judging the primary and secondary provenance was put forward,that is the isoline lobe on a plane. On the basis of study,in combination with agreement degree reflected by above data,it is determined that the primary provenances of upper member of Eh3 are Gucheng,Houzhuang and Pingshi provenance areas,and the secondary provenances are Jinglou-Changqiao,Xia'ermen,Yangqiao,Gui'an and Lishuao provenance areas.