• 责任者：Cao Gaoshe (School of Resources and Environmental Engineering ; Henan Polytechnic University ; Jiaozuo 454003 ; Henan ; China) ; Wang Yawei
• 刊名：Sedimentary Geology and Tethyan Geology
• 出版年：2012
• 卷期：32(1)
• 关键词：沉积盖层 ; sedimentary cover ; 不整合 ; unconformities ; 河南 ; Henan Province
• 页码：p.18-23
• 图表：3 illus, 17 refs.
• 分类号：0803
• issnNo：ISSN1009-3850
• isbnNo：CN51-1593/P

The paper focuses on the boundary and the sedimentary strata between the middle submember (E₂h₂²) and upper submember (E₂h₂¹) of the second member of the Hetaoyuan Formation in the Xidagang outcrop areas, Nanyang depression. The authors contend on the basis of thin section examination,  granulometric analysis,  X-ray diffraction patterns and geochemical signatures that the boundary should be a breakup unconformity rather than the formerly "palaeoexposure surface". This breakup unconformity resulted from the highly extension of the Quwa fault, a NE-trending fault, and represents the transition from the southern faults to the eastern faults in the Nanyang depression.