The timing of recovery after the end‐Permian mass extinction has been a matter of debate, with some authors favouring a more rapid faunal recovery during the Early Triassic and others considering a more protracted biotic reestablishment spanning until the Middle Triassic. In this work, we investigated the lowermost Middle Triassic (Ladinian) carbonate deposits in the Catalan Basin to evaluate the potential environmental mechanisms and evolutionary constrains involved in the kilometre‐scale predominance of microbialites and the low‐diversity and high‐density Planolites association in a low‐latitude epicontinental setting. The studied sedimentary succession records the development from a low‐gradient, homoclinal microbial‐dominated carbonate ramp evolving towards a slightly inclined swell‐dominated type. Sedimentological analysis suggests that facies heterogeneity was controlled by pulses of syn‐rift tectonic activity, which compromised Peri‐Tethyan basin connectivity, reducing palaeobathymetry gradients. Although the monospecific nature of the studied trace‐fossil association may reflect the delayed recovery after the end‐Permian mass extinction, this is inconsistent with widespread, relatively high‐diversity ichnofaunas in carbonates elsewhere in the region. Since other Ladinian basins were characterized by the recurrence of microbial carbonates, low‐diversity ichnoassemblages and limited skeletal production, we hypothesize that shallow and restricted carbonate ramp settings harboured limited ecological complexity and widespread opportunistic colonization of the sediment when compared to coeval open marine locations.

中文翻译：

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西班牙加泰罗尼亚盆地中三叠世限制碳酸盐岩坡道上的微辉石和微量化石：评估上陆大陆环境和演化控制

二叠纪末期大灭绝后恢复的时间一直是个争论的话题，一些作者主张在三叠纪早期进行更快速的动物区系恢复，而另一些人则认为在中三叠纪之前进行更持久的生物重建。在这项工作中，我们调查了加泰罗尼亚盆地中最下部的三叠纪（拉第尼）碳酸盐矿床，以评估潜在的环境机制和演化制约因素，这些因素涉及微斜岩的千米规模优势以及低多样性和高密度浮游生物在低纬度陆上大陆环境中的关联。所研究的沉积演替记录了从低梯度，以单斜系微生物为主的碳酸盐岩坡道向逐渐倾斜的以溶胀为主的碳酸盐岩演化的过程。沉积学分析表明，岩相非均质性受同裂构造活动脉冲控制，这损害了佩里-特提斯盆地的连通性，降低了古生物测量梯度。尽管所研究的痕迹化石协会的单特异性性质可能反映了二叠纪末大灭绝后恢复的延迟，但这与该地区其他地方碳酸盐中普遍存在的，多样性较高的鱼类动物区系不一致。由于其他拉丁尼亚盆地的特征是微生物碳酸盐岩的复发，低多样性鱼鳞组合和骨骼产量有限，