The petrologic and degassing behavior of sulfur and other magmatic volatiles from the 2018 eruption of Kīlauea, Hawaiʻi: melt concentrations, magma storage depths, and magma recycling
The petrologic and degassing behavior of sulfur and other magmatic volatiles from the 2018 eruption of Kīlauea, Hawaiʻi: melt concentrations, magma storage depths, and magma recycling
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2018 年夏威夷凯劳厄火山喷发的硫和其他岩浆挥发物的岩石学和脱气行为：熔体浓度、岩浆储存深度和岩浆回收
DOI：
10.1007/s00445-021-01459-y
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发表时间：
2021
影响因子：
3.5
通讯作者：
Gansecki, Cheryl
中科院分区：
文献类型：
--
作者：
Lerner, Allan H.;Wallace, Paul J.;Shea, Thomas;Mourey, Adrien J.;Kelly, Peter J.;Nadeau, Patricia A.;Elias, Tamar;Kern, Christoph;Clor, Laura E.;Gansecki, Cheryl
Kī劳埃亚火山2018年的下东裂谷地带喷发产生了异常高的熔岩喷发率和创纪录的二氧化硫排放。这次喷发涉及一系列不同的岩浆，包括来自Kī劳埃亚山顶水库的原始玄武岩。我们分析了LERZ基质玻璃、熔融包裹体和寄主矿物，以确定熔体挥发分含量和岩浆储存深度。LERZ玻璃和熔融包裹体几乎涵盖了之前在KīLauea发现的整个成分范围。来自主喷口(裂隙8)的Fo86-89橄榄石中的熔体包裹体在LERZ载体熔体的运输过程中经历了70-170℃的冷却，导致了广泛的圈闭后结晶和硫化物沉淀。即使在对硫化物形成进行校正后，这些熔体包裹体中的许多也具有低硫(400-900ppm)。CO2和H2O蒸气饱和压力表明熔体包裹体捕获深度较浅(1-5千米)，与KīLauea的HalemaʻUmaʻu和南火山口储集层中的地层一致。其中许多夹杂物还具有脱气的δ34S值(− 1.5到 − 0.5‰)。总体而言，这些结果表明，一些原始熔体在被捕获到熔体包裹体之前经历了近表面的脱气。我们认为，数十年至数百年的反复熔岩湖活动和喷发期间的熔岩回流(例如，1959年KīLauea Iki)将大量脱气岩浆循环进入KīLauea的浅层储集层系统。2008年至2018年HalemaʻUmaʻu熔岩湖的脱气和岩浆回收可能减少了LERZ裂隙8岩浆的挥发性含量，导致喷泉高度低于之前许多Kī劳厄火山喷发。火山喷发产生的极端二氧化硫是由于熔岩喷发率很高，而不是因为富含挥发性物质的熔体。
Kīlauea Volcano’s 2018 lower East Rift Zone (LERZ) eruption produced exceptionally high lava effusion rates and record-setting SO2emissions. The eruption involved a diverse range of magmas, including primitive basalts sourced from Kīlauea’s summit reservoirs. We analyzed LERZ matrix glasses, melt inclusions, and host minerals to identify melt volatile contents and magma storage depths. The LERZ glasses and melt inclusions span nearly the entire compositional range previously recognized at Kīlauea. Melt inclusions in Fo86-89olivine from the main eruptive vent (fissure 8) underwent 70–170 °C cooling during transport in LERZ carrier melts, causing extensive post-entrapment crystallization and sulfide precipitation. Many of these melt inclusions have low sulfur (400–900 ppm) even after correction for sulfide formation. CO2and H2O vapor saturation pressures indicate shallow melt inclusion trapping depths (1–5 km), consistent with formation within Kīlauea’s Halemaʻumaʻu and South Caldera reservoirs. Many of these inclusions also have degassed δ34S values (− 1.5 to − 0.5‰). Collectively, these results indicate that some primitive melts experienced near-surface degassing before being trapped into melt inclusions. We propose that decades-to-centuries of repeated lava lake activity and lava drain-back during eruptions (e.g., 1959 Kīlauea Iki) recycled substantial volumes of degassed magma into Kīlauea’s shallow reservoir system. Degassing and magma recycling from the 2008–2018 Halemaʻumaʻu lava lake likely reduced the volatile contents of LERZ fissure 8 magmas, resulting in lower fountain heights compared to many prior Kīlauea eruptions. The eruption’s extreme SO2emissions were due to high lava effusion rates rather than particularly volatile-rich melts.
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DOI：
10.3389/feart.2020.00036
发表时间：
2020-02
期刊：
--
影响因子：
--
作者：
Rachel C. W. Whitty;E. Ilyinskaya;E. Mason;P. Wieser;E. Liu;A. Schmidt;Tjarda Roberts;M. Pfeffer;B. Brooks;T. Mather;M. Edmonds;T. Elias;D. Schneider;C. Oppenheimer;A. Dybwad;P. Nadeau;C. Kern
通讯作者：
Rachel C. W. Whitty;E. Ilyinskaya;E. Mason;P. Wieser;E. Liu;A. Schmidt;Tjarda Roberts;M. Pfeffer;B. Brooks;T. Mather;M. Edmonds;T. Elias;D. Schneider;C. Oppenheimer;A. Dybwad;P. Nadeau;C. Kern
影响因子：
5
作者：
Iacono-Marziano, Giada;Morizet, Yann;Gaillard, Fabrice
通讯作者：
Gaillard, Fabrice
同步喷发：改进对基拉韦厄火山液压连接的限制
影响因子：
5.3
作者：
M. Patrick;T. Orr;K. Anderson;D. Swanson
通讯作者：
D. Swanson
熔岩湖水位控制回顾：来自基拉韦厄火山 Halema‘uma‘u 火山口的见解
影响因子：
3.5
作者：
M. Patrick;D. Swanson;T. Orr
通讯作者：
T. Orr
影响因子：
3.9
作者：
Fiege, Adrian;Holtz, Francois;Goettlicher, Joerg
通讯作者：
Goettlicher, Joerg