The association between Large Igneous Provinces (LIPs) and mass extinctions and anoxic events is attributed to the radical climatic changes in Earth. Even though the Early Cretaceous Paraná–Etendeka Igneous Province has a comparable erupted volume (>1 Mkm³) to other LIPs (e.g., Deccan, Emeishan and Siberian Traps), it remains controversial why this LIP did not contribute to a mass extinction and whether it is associated with the Weissert Event. This work presents new ⁴⁰Ar/³⁹Ar dating over a 425-m vertical stratigraphic profile (out of 1,000 m) that spans three formations of the PE-LIP in southern Brazil (low-Ti Vale do Sol, high-Ti Urubici, and high-Ti Palmas). Our data demonstrate that this mafic lava pile was emplaced in c. 2.0 m.y., from c. 135.5 Ma to c. 133.5 Ma, and endorse the hypothesis that the basaltic and andesitic flows of the Vale do Sol Formation (peak of mafic magmatism) contributed to the Weissert Event.

中文翻译：

---

巴拉那-埃滕德卡大火成岩省的镁铁质火山高潮是魏瑟特事件的触发因素

大型火成岩省 (LIP) 与大规模灭绝和缺氧事件之间的关联归因于地球的剧烈气候变化。尽管早白垩世巴拉那-埃滕德卡火成岩省的喷发量（>1 Mkm ³）与其他 LIP（例如德干、峨眉山和西伯利亚陷阱）相当，但为什么该 LIP 没有导致大规模灭绝以及是否它与 Weissert 事件相关联。这项工作提出了新的⁴⁰ Ar/ ³⁹Ar 测年跨越巴西南部 PE-LIP 的三个地层（低钛 Vale do Sol、高钛 Urubici 和高钛帕尔马斯）的 425 米垂直地层剖面（超过 1,000 米）。我们的数据表明，这个镁铁质熔岩堆位于c。2.0 我的，来自 c。135.5 Ma 到 c。133.5 Ma，并支持 Vale do Sol 组（镁铁质岩浆活动高峰）的玄武岩和安山岩流促成了 Weissert 事件的假设。