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Voluminous silicic eruptions during late Permian Emeishan igneous province and link to climate cooling

机译：二叠纪末峨眉山火成岩时期大量的硅质爆发，与气候冷却有关

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Silicic eruptive units can constitute a substantive component in flood-basalts-dominated large igneous provinces, but usually constitute only a small proportion of the preserved volume due to poor preservation. Thus, their environmental impact can be underestimated or ignored. Establishing the original volume and potential climate-sensitive gas emissions of silicic eruptions is generally lacking for most large igneous provinces. We present a case study for the ~260 Ma Emeishan province, where silicic volcanic rocks are a very minor component of the preserved rock archive due to extensive erosion during the Late Permian. Modal and geochemical data from Late Permian sandstones derived from the province suggest that silicic volcanic rocks constituted some ~30% by volume of the total eroded Emeishan volcanic source rocks. This volume corresponds to >3×10 km on the basis of two independent estimate methods. Detrital zircon trace element and Hf isotopic data require the silicic source rocks to be formed mainly by fractional crystallization from associated basaltic magmas. Based on experimental and theoretical calculations, these basalt-derived ~10 km silicic eruptions released ~10 g sulfur gases into the higher atmosphere and contribute to the contemporaneous climate cooling at the Capitanian-Wuchiapingian transition (~260 Ma). This study highlights the potentially important impact on climate of silicic eruptions associated with large igneous province volcanism.
机译：硅质喷发单位可以构成以洪水玄武岩为主的火成岩大省的实质性组成部分，但由于保存不善，通常仅占保存量的一小部分。因此，它们的环境影响可能被低估或忽略。对于大多数火成岩大省来说，通常缺乏确定硅喷发的原始量和对气候敏感的潜在气体排放的能力。我们以约260个峨眉山省为例，该地区硅质火山岩在二叠纪晚期由于广泛侵蚀而在保存的岩石档案中只占很小的一部分。来自该省的晚二叠世砂岩的模态和地球化学数据表明，硅质火山岩约占侵蚀的峨眉山火山源岩总量的约30％。根据两种独立的估算方法，该体积对应于> 3×10 km。碎屑锆石微量元素和Hf同位素数据要求硅质烃源岩主要由相关玄武岩浆的分步结晶形成。根据实验和理论计算，这些玄武岩衍生的约10 km的硅质喷发向高层大气释放了约10 g的硫气，并有助于在Capitanian-Wuchiapingian过渡期（〜260 Ma）同时进行的气候降温。这项研究强调了与火成岩大省火山活动有关的硅质爆发对气候的潜在重要影响。

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