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松科1井是中国白垩纪大陆科学钻探工程井,由松科1井南孔和松科1井北孔组成,获取了嫩江组888.18m长的完整岩芯资料。通过对嫩江组1550块岩芯样品的热退磁和或交变退磁分析,获得了嫩江组完整的古地磁极性剖面,即由嫩江组下部的正极性带和其中、上部的反极性带构成。综合浮游有孔虫产出层位的地质时代分布、嫩江组二段斑脱岩锆石U-Pb同位素年龄和嫩江组磁极性带构成分析,认为嫩江组二段下至嫩江组一段的正极性磁条带对应于地质年代表中白垩纪静磁带CNS(C34n带)上部,嫩江组二段中部至嫩五段的反极性带对应于白垩纪静磁带之上的第一个反极性带C33r,嫩江组对应的地质时限为中Santonian期至早Campanian期。
The Songke-1 well is a Cretaceous continental scientific drilling engineering well in China. It consists of the Nankong of Songke-1 well and the north hole of Songke-1 well and obtains the complete core data of 888.18m in Nenjiang formation. By analyzing the thermal demagnetization and / or demagnetization analysis of 1550 core samples of Nenjiang Formation, the complete paleomagnetic polarity profile of Nenjiang Formation is obtained, which is composed of the lower positive polarity zone and the middle and upper reverse polarity zones in Nenjiang Formation . Based on the geochronological distribution of the output layer of planktonic foraminifera, the zircon U-Pb isotopic ages of the second member of Nenjiang Formation and the magnetic polarity composition of Nenjiang Formation, it is considered that the positive polarity of the first member of Nenjiang Formation from the second member of Nenjiang Formation The magnetic stripe corresponds to the upper part of the Cretaceous static tape CNS (C34n belt) in the geological time series. The reverse polarity zone from the middle part of the Nenjiang Member to the Nende section corresponds to the first reverse polarity belt above the Cretaceous static tape C33r, the corresponding geological period of the Nenjiang Formation is in the period of Santonian to early Campanian.