Palaeoceanography of the Early Cretaceous of the high latitudes (NE Greenland).

白垩纪早期温室世界普遍温暖均衡的观点受到了一个相当差异化的气候情景的质疑，其中包括寒冷的突发事件，甚至可能导致极地冰盖。这些相互矛盾的解释部分是由于缺乏高纬度地区的数据造成的，而高纬度地区应该对气候变化更敏感。因此，我们提出了一个多代理的方法，在高纬度地区（格陵兰岛东北部），以更好地了解生物，古气候和古海洋学演化的早白垩世（梁赞- Barremian）。根据生物地层分带（菊石）我们打算a）根据钙质超微化石、菊石和锶同位素，建立一个详细的北极-北极多地层方案，这可以与特提斯序列联系起来，B）通过评估钙质超微化石组合的生态重建地表水条件的变化，c）利用微植物群（钙质超微化石）和大型动物群（菊石、箭石）来检验原始高尔夫流的假设，d）解释格陵兰东北部梁赞-巴列阶段高纬度碳酸盐之谜。

The view of a generally warm-equable Early Cretaceous greenhouse world is questioned by a rather differentiated climatic scenario with cold snaps, possibly even causing polar ice caps. These contradictory interpretations are partly caused by a lack of data from the high latitudes which should be more sensitive to climatic changes. We therefore propose a multi-proxy approach based in the high latitudes (NE Greenland) to better understand the biotic, palaeoclimatic and palaeoceanographic evolution of the Early Cretaceous (Ryazanian – Barremian). Based on a biostratigraphic zonation (ammonites) we intend to a) establish a detailed multistratigraphic scheme for the Boreal-Arctic based on calcareous nannofossils, ammonites and strontium isotopy, which can be tied into the Tethyan succession, b) reconstruct changes of surface water conditions by evaluating calcareous nannofossil assemblages ecologically, c) use microfloras (calcareous nannofossils) and macrofaunas (ammonites, belemnites) to test the hypothesis of a proto-Golf stream, d) interpret the Ryazanian – Barremian interval of NE Greenland with respect to the enigma of high latitudinal carbonates.