Considering the evolution of aeolian to marine transitions for the geological record, either catastrophic or gradual transgressive scenarios showing high or low rates of coastal migration have been proposed. A critical evaluation of modern analogues suggests that a catastrophic transgression shares many characteristics with Holocene transgressions, yet they are caused by different rates of sea-level rise. The present study provides insights into the evolution of aeolian to marine transitions in order to discuss these alternative scenarios of sea-level rise. For this purpose, a sedimentological and ichnological analysis was carried out on ten stratigraphic sections of the Picún Leufú area, Argentina. There, marine deposits of the Vaca Muerta Formation accumulated over the aeolian deposits of the Quebrada del Sapo Formation during the early Tithonian. The sedimentary evolution of the transition can be summarized in: (i) a shutdown of aeolian dune field deposition, generating a planation surface in somewhat elevated areas and reworked megadunes in lowlands; (ii) beach sedimentation caused by episodic marine flooding that contributed to megadune reworking; and (iii) deposition in an embayed marginal-marine setting at the coast, recorded by bay margin bindstone, proximal bay and distal bay sedimentation. This transition indicates very rapid coastline migration and a condensed Transgressive Systems Tract succession throughout the study area. Rates of sea-level rise similar to Holocene ones (millimetres to centimetres per year) may have produced the transition between the Quebrada del Sapo and Vaca Muerta formations. The Late Jurassic represents a non-glacial time, and the global sea-level maximum highstand pre-dated the Vaca Muerta transgressive event. Thus, part of the sea-level rise has to be attributed to tectonic/thermal subsidence and compaction of underlying strata, which may have generated these atypical rapid rates of sea-level rise.

中文翻译：

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Vaca Muerta 海侵（上侏罗纪），内乌肯盆地，阿根廷：对风成-海洋转变的演化和时间的洞察

考虑到地质记录中风成向海洋转变的演变，已经提出了显示高或低沿海迁移率的灾难性或逐渐海侵情景。对现代类似物的批判性评估表明，灾难性海侵与全新世海侵具有许多共同特征，但它们是由不同的海平面上升速率引起的。本研究提供了对风成到海洋过渡演变的见解，以讨论这些海平面上升的替代情景。为此，对阿根廷 Picún Leufú 地区的 10 个地层剖面进行了沉积学和地质学分析。那里，Vaca Muerta 组的海相沉积物在提通纪早期积聚在 Quebrada del Sapo 组的风成沉积物上。过渡的沉积演化可以概括为：(i) 风成沙丘场沉积的关闭，在略高的地区产生了平坦的表面，并在低地重新加工了巨型沙丘；(ii) 偶发性海洋洪水造成的海滩沉积，导致巨型沙丘改造；(iii) 海岸带海湾边缘海洋环境中的沉积，由海湾边缘粘结岩、近端海湾和远端海湾沉积物记录。这种转变表明整个研究区域的海岸线迁移非常迅速，并且海侵系统域的演替过程很紧凑。类似于全新世的海平面上升速度（每年毫米到厘米）可能导致了 Quebrada del Sapo 和 Vaca Muerta 地层之间的过渡。晚侏罗世代表非冰期，全球海平面最大高位早于 Vaca Muerta 海侵事件。因此，部分海平面上升必须归因于构造/热沉降和下伏地层的压实，这可能导致了这些非典型的海平面快速上升。