A new look at the volatile output from large flood basalt eruptions

洪水玄武岩省的喷发，如二叠纪末西伯利亚圈闭，与碳循环的重大扰动、全球变暖、海洋缺氧和地质历史上的大规模灭绝有关。大型洪水玄武岩喷发的碳输出受到的限制很小。我们建议对西伯利亚圈闭的熔岩流、盖层和岩床的气体释放进行概念验证研究。我们将使用一项对熔体包裹体和流体气泡进行的新的微观分析研究，以限制与岩浆作用相关的挥发性预算，不仅包括从熔岩和未喷发的岩浆中释放气体，还将建立在新研究的基础上，这些研究表明了污染沉积物中的挥发物所起的作用。这些气体通量将成为未来改进的与洪水玄武岩事件相关的气候和生物影响模型的关键输入。我们预计这项工作将导致一项更大规模的研究，该研究将考察大型火成岩省份和现代岩浆波动预算在环境变化中的重要性。

The eruption of flood basalt provinces such as the end-Permian Siberian Traps have been linked to significant perturbations of the carbon cycle, global warming, ocean anoxia and large-scale extinctions in the geological past. The carbon output of large flood basalt eruptions is poorly constrained. We propose a proof-of-concept study of gas release from lava flows, tephra and sills of the Siberian Traps. We will use a novel microanalytical study of melt inclusions and fluid bubbles to constrain the volatile budget associated with the magmatism, incorporating gas release not only from lava and unerupted magma but also building on new studies that have indicated a role for a contribution of volatiles from contaminating sediments. These gas fluxes will form key inputs for future improved models of climatic and biotic impact associated with flood basalt events. We anticipate this work will lead to a larger study that will examine the importance of large igneous provinces and modern magmatic volatile budgets in environmental change.