Constraining the timing of emplacement, duration and magma extrusion rates of large igneous provinces is essential for evaluating their petrogenetic evolution and possible links to environmental changes that cause mass extinctions. The Paraná-Etendeka continental flood basalts correspond to a voluminous and purportedly short magmatic event that erupted during the Early Cretaceous in southwestern Gondwana, predating its breakup. During this event, large amounts of mafic and felsic lavas and associated products (volcaniclastic rocks, dykes, sills and intrusive complexes) were formed. A compilation of the existing published ⁴⁰Ar/³⁹Ar step-heating (n = 378) and U/Pb (n = 32) ages, followed by the recalculation and filtering of the ⁴⁰Ar/³⁹Ar step-heating data, places the initial eruptive stages at 135.0 ± 0.6 Ma, with the extrusion of the Tafelkop low-Ti mafic magmas. Volcanic activity peaked at 134.4 ± 0.1 Ma with the ongoing emplacement of low-Ti magmas and with the onset of high-Ti mafic and silicic volcanism in the north, with major events lasting until 133.2 ± 0.3 Ma and eruptions possibly ceasing at 132.0 ± 0.2 Ma. Igneous activity, mostly in the form of dykes, apparently persisted for an additional 10 million years after the breakup of Gondwana and the subsequent initial drifting stages of the South Atlantic basin. The compiled and recalculated results confirm the brevity (1.6–3.0 m.y.) of the main phase of the Paraná-Etendeka volcanism. They also suggest a possible temporal link between the Paraná-Etendeka magmatism and the Weissert event δ¹³C excursion.

限制大型火成岩省的入位时间、持续时间和岩浆喷出率对于评估它们的岩石成因演化以及与导致大规模灭绝的环境变化的可能联系至关重要。Paraná-Etendeka 大陆洪水玄武岩对应于冈瓦纳西南部早白垩世期间爆发的大规模且据称是短暂的岩浆事件，早于其破裂。在这一事件中，形成了大量的镁铁质和长英质熔岩及相关产物（火山碎屑岩、岩脉、窗台和侵入杂岩）。现有已发表的⁴⁰ Ar/ ³⁹ Ar 阶梯加热 ( n  = 378) 和 U/Pb ( n  = 32) 年龄的汇编，然后重新计算和过滤⁴⁰氩/ ³⁹Ar 阶梯加热数据将初始喷发阶段置于 135.0 ± 0.6 Ma，伴随着 Tafelkop 低钛基性岩浆的挤压。随着低钛岩浆的持续侵位和北部高钛基性和硅质火山活动的开始，火山活动在 134.4 ± 0.1 Ma 达到峰值，主要事件持续到 133.2 ± 0.3 Ma，喷发可能在 132.0 ± 0.2 停止。嘛。火成岩活动，主要以岩脉的形式出现，显然在冈瓦纳大陆分裂和南大西洋盆地随后的初始漂流阶段之后又持续了 1000 万年。编译和重新计算的结果证实了巴拉那-埃滕德卡火山活动主要阶段的短暂性（1.6-3.0 my）。他们还提出了巴拉那-埃滕德卡岩浆活动与魏塞特事件 δ ¹³之间可能存在的时间联系C.游览。