A regional seismic survey on the southeastern Lomonosov Ridge (LR) and adjacent basins provides constraints on the coupled evolution of ocean circulations, depositional regime, and tectonic processes. First, Mesozoic strata on the LR, its faulted flanks and the initial Amundsen Basin were covered with syn‐rift sediments of Paleocene to early Eocene age. Numerous vertical faults indicate differential compaction of possibly anoxic sediments deposited in the young, still isolated Eurasian Basin. The second stage, as indicated by a prominent high‐amplitude‐reflector sequence covering the ridge, was a time of widespread changes in deposition conditions, likely controlled by the ongoing subsidence of the LR and gradual opening of the Fram Strait. Episodic incursions of water masses from the North Atlantic probably were the consequences and led to the deposition of thin sedimentary layers of different lithology. The third stage is marked by continuous deposition since the early Miocene (20 Ma). At that time, the ridge no longer posed an obstacle between the Amerasia and Eurasia Basins and pelagic sedimentation was established. Drift bodies, sediment waves, and erosional structures indicate the onset of circulation. Faulting on the ridge slope has led to a series of terraces where sediment drifts have accumulated since the early Miocene. It is suggested that ongoing sagging of the ridge and currents may have shaped the steep sediment free flanks of the terraces. Lastly, a sequence of high‐amplitude reflectors marks the transition to the early Pliocene large‐scale Northern Hemisphere glaciations.

中文翻译：

---

基于地震数据的东南罗蒙诺索夫海岭及其欧亚侧翼的沉积历史和古活动

在东南罗蒙诺索夫海岭（LR）和邻近盆地进行的区域地震勘测为海洋环流，沉积机制和构造过程的耦合演化提供了限制。首先，LR上的中生界地层，其断层侧面和最初的Amundsen盆地被古新世同裂谷沉积物覆盖到始新世早期。许多垂直断层表明，沉积在年轻但仍孤立的欧亚盆地的可能缺氧沉积物的压实差异。第二阶段，如覆盖着山脊的突出的高振幅反射层序列所示，是沉积条件发生广泛变化的时期，很可能是由于LR的沉陷和Fram海峡的逐渐开放所控制。后果是北大西洋水团的大规模入侵，其后果是导致不同岩性的薄沉积层沉积。第三阶段以中新世（20 Ma）以来的连续沉积为特征。那时，山脊不再在美国和欧亚大陆盆地之间构成障碍，并建立了中上层沉积。漂移体，沉积物波和侵蚀结构表明循环的开始。自中新世以来，山脊斜坡的断层导致了一系列阶地，在这些阶地中，沉积物漂移已累积。有人认为，持续的山脊和洋流下陷可能已经形成了梯田陡峭的无沉积物侧面。最后，