【摘要】 根据在北淮阳地区杨山组底部砾岩中的碳酸盐岩砾石里首次发现的多种早古生代化石和于该区中石炭统胡油坊组中采获了华北型石炭纪叶肢介,以及对信阳-舒城断裂的性质有了新的认识,认为信阳-舒城断裂就是中国南北板块之间在北淮阳段的地缝合线。该断裂带以北都可列入油气普查区。更多还原

【Abstract】 The suture zone between the south and north China Plates has long beendisputed. One of the main arguments is which plate should the area betweenthe south of Queshan-Feizhong fault and the north of Xinyang-Shucheng faultbelong to. We have discovered Heliolites cf. anhuiensis,panderodus gracilis, Kirkbyellasp. and other fossils in the carbonate gravels of the bottom conglomerate ofthe Yangshan Formation in Shangcheng County,Henan Province. These fossilsbelong to the Early Paleozoic, and most likely to the Silurian. In the meantime, Protomonocarina sp. was found in the Huyuofang Formation near Feng-huang Primary School, Shangcheng County. The above Conchostraca fossilsof the Middle Carboniferous were only found in the Benxi Formation, KaipingBasin in North China. It shows clearly that the Late Paleozoic sediments in northHuaiyang are intimately tied up with the Carboniferous system in North ChinaPlate. We have reason to consider that north Huaiyang and North China Plat-form were linked as a whole at least in the Carboniferous Period. Based on (1)Xinyang-Shucheng fault has the nature of ductile shearing:(2) A series of overthrust nappes thrust northward; (3) Ophiolite zoneand tectonic melanges are distributed along the fault; (4) 3T-type polysilicicmuscovite and C-type eclogite discovered in Luoshan-Xinxian section of thefault are produced in low temperature-high pressure environments; (5) Thefault was a sudden change zone in geophysic fields; (6) Paleogeomagneticmeasurement shows that the paleolatitude of the sampling point in the MeishanGroup was 25-28°N, and that of the sampling point of the Fuziling Groupwas 1-5°N. This indicates that there might have been a drifting process for thetwo groups in geological history. We thus consider that Xinyang-Shucheng faultis a geosuture line of the Daibie suture zone in north Huiyang. Therefore,hydrocarbon exploration range in the North China Platform may cross overQueshan-Feizhong fault, and may even extend to Xinyang-Shucheng fault.Whereas the coal-bearing formation of frontal depression in north Huiyangregion is significant for coal-formed oil and gas.更多还原