Department of Geology, State University of New York at Buffalo, 126 Cooke Hall, Buffalo, NY, 14260, USA.
Earth Observatory of Singapore, Nanyang Technological University 50 Nanyang Avenue, Singapore, 639798, Singapore.
Nat Commun. 2018 Jul 9;9(1):2657. doi: 10.1038/s41467-018-05086-8.
Volatile element concentrations measured in melt inclusions are a key tool used to understand magma migration and degassing, although their original values may be affected by different re-equilibration processes. Additionally, the inclusion-bearing crystals can have a wide range of origins and ages, further complicating the interpretation of magmatic processes. To clarify some of these issues, here we combined olivine diffusion chronometry and melt inclusion data from the 2008 eruption of Llaima volcano (Chile). We found that magma intrusion occurred about 4 years before the eruption at a minimum depth of approximately 8 km. Magma migration and reaction became shallower with time, and about 6 months before the eruption magma reached 3-4 km depth. This can be linked to reported seismicity and ash emissions. Although some ambiguities of interpretation still remain, crystal zoning and melt inclusion studies allow a more complete understanding of magma ascent, degassing, and volcano monitoring data.
包裹体中测量的挥发分元素浓度是理解岩浆运移和排气的重要工具，尽管它们的原始值可能受到不同的再平衡过程的影响。此外，含包裹体的晶体可能有广泛的起源和年龄，这进一步使岩浆过程的解释复杂化。为了澄清其中的一些问题，我们在这里结合了智利 2008 年拉利马火山喷发的橄榄石扩散年代学和熔体包裹体数据。我们发现，岩浆侵入发生在喷发前约 4 年，最小深度约为 8 公里。随着时间的推移，岩浆迁移和反应变得越来越浅，大约在喷发前 6 个月，岩浆到达 3-4 公里的深度。这与报告的地震活动和火山灰喷发有关。尽管解释仍然存在一些模糊性，但晶体分带和熔体包裹体研究可以更全面地了解岩浆上升、排气和火山监测数据。
