晚白垩世松辽盆地年纹层沉积特征与百年-年际尺度古气候变化

Study on centennial- to interannual-scale climate variability in the Late Cretaceous is significant for understanding greenhouse climate evolution in deep-time and future climate change in the next hundred years. However, this study is hampered by limited number of high-resolution geological records. The newly discovered varve deposits in the Songliao Basin provide valuable materials for such study. In this project, we plan to take advantage of the continuous cores of "Continental Scientific Drilling of Cretaceous Songliao Basin: SK-1 and SK-2", and conduct high-resolution sedimentological, elemental geochemical, chronological researches on lacustrine mudstones of Qingshankou Formation, Nenjiang Formation, etc. Sedimentary characteristics and forming mechanisms of the varves will be illuminated so as to establish another precious varve series in Cretaceous. Centennial- to interannual-scale climate cycles will be analyzed and compared with Late Cretaceous paleoclimatic records of different temporal scales (million-year scale, centennial to interannual scale) and different spatial scales (basinal scale, continental scale, global scale). Finally, we will discuss the features and mechanisms of centennial- to interannual-scale climate variability under greenhouse conditions.

研究晚白垩世百年-年际尺度古气候对于理解“深时”温室气候演化和认识未来百年气候变化均有重要意义。然而这项研究受限于高分辨率地质记录的获取，最新发现的松辽盆地年纹层提供了宝贵的研究素材。本项目拟发挥“松辽盆地大陆科学钻探——松科1井与松科2井”岩心的材料优势，对青山口组、嫩江组等层位的湖相泥岩开展高分辨率的沉积学、元素地球化学、地质年代学研究，确定年纹层的沉积特征、环境与成因，建立全球屈指可数的白垩纪年纹层记录；进而分析晚白垩世百年-年际尺度古气候旋回，对比不同时间尺度（百万年构造尺度、百年至年际尺度）、不同空间尺度（松辽盆地、东亚地区、全球海-陆环境）古气候资料，探讨温室气候下百年-年际气候变化的特征和机制。

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