(Table T1) Coral taxa and their ecological significance in ODP Site 194-1196 and Hole 194-1199A sediments

The Southern Marion Plateau (SMP) represents a vertical stacking of Miocene carbonate platform deposits. Two sites (1196 and 1199) were drilled on top of this plateau, penetrating a 663-m carbonate succession of bioclastic and reefal sedimentary bodies. The study focuses on the least dolomitized 410-m-thick upper part of the succession, which is middle to late Miocene in age. Sedimentological and paleontological studies were conducted at both sites in order to propose a paleoenvironmental model and its evolution through the Miocene age. Six main microfacies of possible environmental significance were defined using statistical multivariate analyses, based on the recognition and point counting of 24 biogenic components. Depositional environment reconstructions are proposed as well as the biosedimentary and the environmental evolution regarding seismic architectures, stratigraphy, biosedimentology, and microfacies analysis. The SMP platform mainly results from a vertical stacking of lens-shaped bodies in homoclinal to distally steepened ramp settings.

南马里恩高原（Southern Marion Plateau, SMP）是中新世碳酸盐岩台地沉积的垂向堆叠体。该高原顶部钻取了两个站位（1196与1199），穿透了一套由生物碎屑与礁相沉积体构成的663米厚碳酸盐岩序列。本研究聚焦于该序列中白云石化程度最低的上部410米厚地层，其地质年代为中新世中晚期。研究团队对两个站位开展了沉积学与古生物学研究，旨在构建中新世时期的古环境模型及其演化历程。基于对24种生物组分的识别与点计数，研究团队通过多元统计分析方法界定了6类具有潜在环境指示意义的主要微相（microfacies）。研究同时基于地震反射结构、地层学、生物沉积学与微相分析，提出了沉积环境重建方案，以及生物沉积与环境演化历程。该台地主要形成于透镜状沉积体的垂向堆叠，其沉积环境为均斜至远端变陡的缓坡体系。