The Valanginian Stage is marked by a period of global positive δ13C carbon cycle perturba-tion and biotic crises, which are collectively referred to as the Valanginian event (VE). Many attempts have been made to link the Parana-Etendeka large igneous province volcanism with the VE. However, currently there is no conclusive proof to support this hypothesis, since the timing and duration of the volcanic activity are not known with suf cient precision. In this study, we signi cantly revise the time scales of magmatism and environmental impact of the Parana magmatic province (PMP) in Brazil with new high-precision zircon U-Pb ages from the low-Ti Palmas and high-Ti Chapeco sequences. Our data demonstrate that signi - cant volumes of low-Ti silicic rocks from the PMP erupted rapidly at ca. 133.6 Ma within 0.12 ± 0.11 k.y. The age of the high-Ti Chapeco sequence from central PMP is constrained at ca. 132.9 Ma and thus extends the duration of magmatic activity by ∼700 k.y. Our new ages are systematically younger than previous ages and postdate the major positive carbon isotope excursion, indicating that PMP silicic magmatism did not trigger the VE but could have contributed to extending its duration. Within the framework of the stratigraphic column of the PMP, the earliest low-Ti basalts could have been responsible for the VE if they are at least 0.5 m.y. older than the low-Ti silicic rocks dated herein.

中文翻译：

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巴拉那岩浆省（巴西）的硅质岩浆的快速喷发并未引发瓦兰吉尼亚事件

Valanginian阶段的标志是一段全球正δ13C碳循环扰动和生物危机，统称为Valanginian事件（VE）。许多尝试将巴拉那-埃滕德卡大型火成岩省火山作用与 VE 联系起来。然而，目前没有确凿的证据来支持这一假设，因为火山活动的时间和持续时间还没有足够的精确度。在这项研究中，我们利用来自低钛帕尔马斯和高钛查佩科层序的新的高精度锆石 U-Pb 年龄，显着修正了巴西巴拉那岩浆区 (PMP) 的岩浆活动和环境影响的时间尺度。我们的数据表明，来自 PMP 的大量低钛硅质岩在约 133.6 Ma 0.12 ± 0.11 ky 来自中央 PMP 的高钛 Chapeco 序列的年龄被限制在大约。132.9 Ma，因此将岩浆活动的持续时间延长了约 700 ky 我们的新时代系统地比以前的时代年轻，并且晚于主要的碳同位素正偏移，这表明 PMP 硅质岩浆活动没有触发 VE，但可能有助于延长其持续时间. 在 PMP 地层柱的框架内，如果最早的低钛玄武岩比此处确定的低钛硅质岩年长至少 0.5 岁，则它们可能是造成 VE 的原因。表明 PMP 硅质岩浆作用没有触发 VE，但可能有助于延长其持续时间。在 PMP 地层柱的框架内，如果最早的低钛玄武岩比此处确定的低钛硅质岩年长至少 0.5 岁，则它们可能是造成 VE 的原因。表明 PMP 硅质岩浆作用没有触发 VE，但可能有助于延长其持续时间。在 PMP 地层柱的框架内，如果最早的低钛玄武岩比此处确定的低钛硅质岩年长至少 0.5 岁，则它们可能是造成 VE 的原因。