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

泛滥玄武岩区的喷发，如二叠纪末西伯利亚圈闭的喷发，与过去地质学中碳循环、全球变暖、海洋缺氧和大规模喷发的重大扰动有关。大洪水玄武岩喷发的碳输出受到很大的限制。我们提出了一个验证的概念研究的气体释放的熔岩流，火山灰和岩床的西伯利亚陷阱。我们将使用一种新的熔融包裹体和流体气泡的微观分析研究，以限制与岩浆活动相关的挥发性预算，将气体释放不仅从熔岩和未喷发的岩浆，但也建立在新的研究表明，污染沉积物的挥发物的贡献的作用。这些气体通量将成为未来改进与洪水玄武岩事件相关的气候和生物影响模型的关键投入。我们预计这项工作将导致一个更大的研究，将审查大火成岩省和现代岩浆不稳定的预算在环境变化的重要性。

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.