The Eocene Epoch corresponds to the runup toward the Greenhouse to Icehouse Cenozoic transition. To fully appreciate this climate evolution, detailed and accurate age‐depth models are required. While much progress has been made recently in the field of Eocene astrochronology, the construction of unambiguous Eocene astronomical timescales (ATS) is hampered by lithologically undetected hiatuses, the scarcity of carbonate‐rich marine successions, and conflicting cyclostratigraphies. In this study, we present an orbital‐scale cyclostratigraphy for Ocean Drilling Program (ODP) Hole 762C, and we reconstruct Eastern Indian Ocean dynamics. This reconstruction is based on two ocean‐drilling Eocene sequences: ODP Hole 762C and International Ocean Discovery Program (IODP) Site U1514. Our eccentricity‐based cyclostratigraphy for Hole 762C is integrated with existing bio and magnetostratigraphies and constitutes the most precise available chronology for this legacy site. The Hole 762C stratigraphy is combined with the existing Site U1514 age‐depth model to obtain a high‐resolution Eocene ATS for the Eastern Indian Ocean. We apply sedimentary noise modeling to obtain new insights in benthic turbulence at both sites. Despite the significant difference in paleo‐waterdepth, noise levels at both sites carry a 1.2‐Myr obliquity amplitude imprint. We interpret the sedimentary noise at Hole 762C, on a submarine plateau, in terms of sea‐level change. The sedimentary noise at U1514, by contrary, is interpreted to be modulated by bottom current intensity as this site represents a deep‐sea basinal environment. We conclude that, despite very similar astronomical signatures, the mechanistic pathways between astronomical forcing and sedimentary response were radically different at these two sites.

中文翻译：

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利用海钻地层记录重建始新世东印度洋动力学

始新世纪对应于温室向冰室新生代过渡的阶段。为了充分理解这种气候演变，需要详细而准确的年龄深度模型。尽管最近在始新世天文年代学领域取得了很大进展，但明确的始新世天文时标（ATS）的构建却受到岩性上未发现的裂隙，碳酸盐岩丰富的海相演替稀缺以及循环地层学的阻碍。在这项研究中，我们提出了海洋钻探计划（ODP）762C孔的轨道尺度旋回地层，并且重建了东印度洋动力学。此重建基于两个海洋钻井始新世序列：ODP孔762C和国际海洋发现计划（IODP）站点U1514。我们针对762C孔的基于偏心率的旋回地层学与现有的生物地层学和磁地层学相结合，构成了该遗留场址最精确的可用年代。Hole 762C地层学与现有的Site U1514年龄深度模型相结合，为东印度洋获得了高分辨率的始新世ATS。我们应用沉积噪声建模来获得两个地点底栖湍流的新见解。尽管古水深存在显着差异，但两个地点的噪声水平均带有1.2毫米的倾角振幅印记。我们根据海平面变化来解释海底高原762C孔处的沉积噪声。相反，U1514的沉积噪声被解释为受底流强度的影响，因为该地点代表了深海盆地环境。我们得出结论，