The onset and evolution of the middle to late Cenozoic “icehouse” world was influenced by the development of the global ocean circulation linking the Norwegian–Greenland Sea‐Arctic Ocean to the Atlantic Ocean. The evolution of the early Neogene to early Quaternary Bjørnøyrenna Drift, located at the SW Barents Sea continental margin, shed new light on this important hydrological event. By analyzing seismic data and exploration wellbores, it is found that the drift likely started to form in the early/middle Miocene, probably as a result of an ocean circulation reorganization following the opening of the Fram Strait gateway (c. 17 Ma) and subsidence of the Greenland–Scotland Ridge (c. 12 Ma). Thus, the onset of drift growth is considered to have happened close in time to the Mid Miocene Climatic Optimum at 16–14 Ma, and was part of a regional onset of large‐scale ocean circulation in the Norwegian–Greenland Sea that influenced the subsequent climate cooling. The drift continued to grow under the influence of early Quaternary glacimarine sedimentation, and later overtopping of the drift mound by downslope transfer of glacigenic sediments during full‐glacial conditions resulted in a submarine failure. For the first time, minimum average sedimentation rates of a Neogene to Quaternary drift in this area is calculated, giving rates of 0.020–0.031 m/Kyr. These values are comparable to average deep‐sea sedimentation rates from modern low‐latitude river systems such as the Amazon and Mississippi, but lower than the Quaternary glacial sedimentation rates from the Barents Sea and Fennoscandian continental margins.

中文翻译：

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挪威北极西南巴伦支海大陆边缘的早期新近纪—早期第四纪等高线漂移系统

中，新生代“冰屋”世界的发生和演变受到将挪威-格陵兰海-北冰洋与大西洋连接起来的全球海洋环流的影响。位于巴伦支海大陆边缘的新近纪早期到第四纪比约恩纳伦漂流的早期演变，为这一重要的水文事件提供了新的思路。通过分析地震数据和勘探井眼，发现漂移可能开始于中新世早期/中期，这可能是由于Fram海峡门户开放（约17 Ma）和下沉后海洋环流重组的结果。格陵兰-苏格兰山脊（约12 Ma）。因此，认为漂移增长的发生时间接近中新世中期的最佳气候，时间为16-14 Ma，并且是挪威格陵兰海大规模海洋环流区域性发作的一部分，影响了随后的气候降温。在第四纪早期冰川沉积作用的影响下，漂移继续增长，后来在全冰期条件下，由于成冰川沉积物的下坡转移而导致的漂移丘顶超标，导致了海底破坏。首次计算了该地区新近纪至第四纪漂移的最小平均沉积速率，得出的沉积速率为0.020-0.031 m / Kyr。这些数值可与现代低纬度河流系统（如亚马逊河和密西西比河）的平均深海沉积率相媲美，但低于巴伦支海和芬诺斯堪的亚大陆边缘的第四纪冰川沉积率。