In recent years, multiple Mesozoic episodes of crustal shortening and extension have been documented throughout Patagonia. These findings unveil a complex history of regional intraplate tectonic deformation. Nevertheless, there are numerous sectors in this vast region that have yet to undergo in-depth tectonic investigations, and hence aspects of its evolutionary history remain elusive. We present herein a comprehensive dataset comprising geophysical data (2D seismic lines), field data (detailed geological mapping and lithofacies analysis), and UPb geochronological data (LA-ICP-MS and SHRIMP zircon ages) from a key region in southern Patagonia, known as the Bajo Grande area, located in the center of the Deseado Massif. The datasets support the hypothesis of a Late Jurassic(?) to Early Cretaceous shortening event that led to the tectonic inversion of former Jurassic (or may be older) extensional depocenters. This episode promoted the -inversion (syn-orogenic) deposition of Late Jurassic(?)-Early Cretaceous (140 ± 3 Ma) epiclastic and pyroclastic rocks within NNE-striking depocenters. These rocks are part of the Bajo Grande Formation, representing one of the oldest documented syn-orogenic sequences in southern Patagonia. This shortening event may have been triggered by a far-field response to the opening of the Rocas Verdes basin and to the rift-drift transition of the South-Atlantic Ocean.

中文翻译：

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巴霍格兰德盆地：冈瓦纳大陆西南部的晚侏罗世（？）-早白垩世同造山沉积中心

近年来，巴塔哥尼亚地区多次记录了中生代地壳缩短和伸展的事件。这些发现揭示了区域板内构造变形的复杂历史。然而，这个广阔地区的许多部分尚未进行深入的构造调查，因此其演化历史的某些方面仍然难以捉摸。我们在此提出了一个综合数据集，包括来自巴塔哥尼亚南部关键地区的地球物理数据（2D 地震线）、现场数据（详细的地质测绘和岩相分析）和 UPb 地质年代学数据（LA-ICP-MS 和 SHRIMP 锆石年龄）。巴霍格兰德 (Bajo Grande) 地区，位于德塞阿多 (Deseado) 地块的中心。这些数据集支持侏罗纪晚期（？）到白垩纪早期缩短事件的假设，该事件导致前侏罗纪（或可能更古老）的伸展沉积中心发生构造反转。这一事件促进了晚侏罗世（？）-早白垩世（140 ± 3 Ma）北北东走向沉积中心内的碎屑岩和火山碎屑岩的反转（同造山）沉积。这些岩石是巴霍格兰德地层的一部分，代表巴塔哥尼亚南部最古老的同造山序列之一。这种缩短事件可能是由对罗卡斯维第斯盆地开放和南大西洋裂谷-漂移转变的远场响应引发的。