Major environmental changes marked the Carnian (Late Triassic), including global warming and enhanced hydrological cycling linked to multiple carbon cycle perturbations. These perturbations occurred in an interval called the Carnian Pluvial Episode (CPE), between the Julian 1–Julian 2 boundary and the base of the Tuvalian 2 (late early to middle late Carnian). The CPE is linked to pronounced changes in terrestrial and marine sedimentary basins, with abrupt switches in the sedimentation style and a widespread crisis of carbonate systems. In this study, we have quantified changes in sedimentation rate and the relative variations in sedimentation rate through well age-constrained successions spanning the CPE in different marine basins. Relative to background (pre-CPE) Julian 1 values, during the CPE interval sedimentation rates rose by 142%–3400% in the Julian 2, and then decreased in the Tuvalian 1 in the marine sequences of Western Tethys and Panthalassa. By contrast, in the successions of Eastern Tethys sedimentation rates dropped by 50%–100% across the CPE interval. In the Western Tethys, the high increases in sedimentation rates were coupled with a shift from prevailing carbonate to siliciclastic sedimentation, but a similar lithological shift is associated with a decrease in sedimentation rates in Eastern Tethys. In Panthalassa, higher Julian 2 sedimentation rates can be linked to mineralogical and geochemical evidence of increased input of aeolian dust under arid environmental conditions. The heterogenous changes in sedimentation rate across different basins/regions during the CPE interval indicate that sedimentation was likely controlled by the interplay of different, sometimes local phenomena such as synsedimentary tectonism, sea-level oscillations and climate. However, they could ultimately be related to palaeogeographically different responses to the pronounced environmental changes implied by the Carnian carbon cycle perturbations.

中文翻译：

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卡尼期洪积期（晚三叠世）海洋沉积速率大幅变化的古地理异质性


卡尼期（晚三叠世）发生了重大环境变化，包括全球变暖和与多种碳循环扰动相关的水文循环增强。这些扰动发生在称为卡尼期洪积期（CPE）的区间，位于朱利安 1-朱利安 2 边界和图瓦利 2 底部（卡尼期早晚到中晚）之间。 CPE 与陆地和海洋沉积盆地的显着变化有关，包括沉积类型的突然转变和碳酸盐系统的广泛危机。在本研究中，我们通过跨越不同海洋盆地的 CPE 的受井龄限制的序列，量化了沉积速率的变化和沉积速率的相对变化。相对于背景（CPE 前）Julian 1 值，在 CPE 间隔期间，在西特提斯和 Panthalassa 海洋层序中，Julian 2 沉积速率上升了 142%–3400%，然后在图瓦利亚 1 沉积速率下降。相比之下，在东特提斯洋的 CPE 层段沉积速率连续下降了 50%–100%。在西特提斯，沉积速率的大幅增加伴随着从盛行碳酸盐沉积到硅质碎屑沉积的转变，但类似的岩性转变与东特提斯沉积速率的降低有关。在 Panthalassa，较高的 Julian 2 沉积率可能与干旱环境条件下风尘输入增加的矿物学和地球化学证据有关。 CPE期间不同盆地/区域沉积速率的异质变化表明，沉积可能是由不同的、有时是局部现象（例如同沉积构造运动、海平面振荡和气候）相互作用控制的。 然而，它们最终可能与古地理对卡尼期碳循环扰动所暗示的明显环境变化的不同反应有关。