Oceanic intraplate explosive eruptions fed directly from the mantle
Oceanic intraplate explosive eruptions fed directly from the mantle
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海洋板内爆炸性喷发直接来自地幔
DOI：
10.1073/pnas.2302093120
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Monteleone, Brian
中科院分区：
文献类型：
--
作者：
DeVitre, Charlotte L.;Gazel, Esteban;Ramalho, Ricardo S.;Venugopal, Swetha;Steele-MacInnis, Matthew;Hua, Junlin;Allison, Chelsea M.;Moore, Lowell R.;Carracedo, Juan Carlos;Monteleone, Brian
限制岩浆的挥发性含量对于我们理解喷发过程及其对行星可居住性至关重要的地球深部循环至关重要[R。达斯古普塔湾M.赫希曼地球Sci. Lett.298，1（2010）]。然而，到目前为止，关于岩浆挥发物的大部分工作都致力于了解它们在俯冲带中的循环。此外，板内镁铁质火山作用的研究不成比例地集中在夏威夷[P.E. Wieser等人，地球化学地球物理学Geosyst.22，e2020 GC 009364（2021）]，这使得评估板内火山在全球波动周期中的总体作用成为一项挑战。此外，虽然镁铁质火山是地球和太阳系最常见的地貌[C。A. Wood，J. Volcanol.地热。Res.7，387-413（1980）]，当涉及到它们的潜在爆炸性时，它们往往被忽视，而被忽视。在这里，我们报告了来自卡波维德福戈火山的原始（橄榄石为主，镁含量为78至88%）熔融包裹体（MI）数据，这表明海洋板内二氧化硅不饱和爆炸性喷发对富含挥发物的来源进行了采样。原始MI（熔体Mg# 70至71%）数据表明，这些熔体被氧化（NiNiO至NiNiO+1），挥发物含量非常高（高达2wt%CO2、2.8wt%H2O、6，000 ppm S、1，900 ppm F和1，100 ppm Cl），使Fogo成为全局端元。从这些高挥发性含量计算的存储深度也意味着，在Fogo岩浆存储发生在地幔深处（~20至30公里），这些喷发是从地幔美联储。我们的研究结果表明，海洋板内镁铁质喷发是持续从地幔的高挥发分浓度继承了他们的来源和深CO2出溶（这里高达~800 MPa）驱动他们的上升和爆炸性。
Constraining the volatile content of magmas is critical to our understanding of eruptive processes and their deep Earth cycling essential to planetary habitability [R. Dasgupta, M. M. Hirschmann,Earth Planet. Sci. Lett.298, 1 (2010)]. Yet, much of the work thus far on magmatic volatiles has been dedicated to understanding their cycling through subduction zones. Further, studies of intraplate mafic volcanism have disproportionately focused on Hawaii [P. E. Wieser et al.,Geochem. Geophys. Geosyst.22, e2020GC009364 (2021)], making assessments of the overall role of intraplate volcanoes in the global volatile cycles a challenge. Additionally, while mafic volcanoes are the most common landform on Earth and the Solar System [C. A. Wood,J. Volcanol. Geotherm. Res.7, 387–413 (1980)], they tend to be overlooked in favor of silicic volcanoes when it comes to their potential for explosivity. Here, we report primitive (olivine-hosted, with host Magnesium number – Mg# 78 to 88%) melt inclusion (MI) data from Fogo volcano, Cabo Verde, that suggest that oceanic intraplate silica-undersaturated explosive eruptions sample volatile-rich sources. Primitive MI (melt Mg# 70 to 71%) data suggest that these melts are oxidized (NiNiO to NiNiO+1) and very high in volatiles (up to 2 wt% CO2, 2.8 wt% H2O, 6,000 ppm S, 1,900 ppm F, and 1,100 ppm Cl) making Fogo a global endmember. Storage depths calculated from these high volatile contents also imply that magma storage at Fogo occurs at mantle depths (~20 to 30 km) and that these eruptions are fed from the mantle. Our results suggest that oceanic intraplate mafic eruptions are sustained from the mantle by high volatile concentrations inherited from their source and that deep CO2exsolution (here up to ~800 MPa) drives their ascent and explosivity.
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