流纹岩-熔融体地球压测量揭示了Krafla IDDP-1的浅层储存条件及其对全球浅层岩浆活动的影响

IF 4.8 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Lydia J. Harmon , Guilherme A.R. Gualda , Blake M. Wallrich , Calvin F. Miller
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引用次数: 0

摘要

在喷发前确定以熔体为主的岩浆体的储存深度对了解岩浆运输、喷发危险性和岩浆体寿命至关重要。流纹岩-熔融体(rhyolite - melt)已被有效地用于计算上地壳(~ 100 - 350 MPa)硅质岩浆体的爆发前储存压力,但其在极低压系统(<100 MPa)中的精度和准确性尚未得到充分的研究。在2009年的Krafla IDDP-1钻探项目中,岩浆出人意料地在2.1公里深处相交。在这里,我们使用在已知深度相交的天然Krafla IDDP-1成分,测试了流纹岩-熔融地压测量法在这个极低压系统中的应用。我们输入熔体的成分(以玻璃的形式保存),并在压力、温度和氧逸度(fO2)空间中搜索,以模拟Krafla岩浆的储存条件。对于钻孔玻璃的平均成分,流纹岩-熔融体产生合理的储存压力(~ 40-50 MPa)。将计算压力换算成深度后,计算深度为1.6 ~ 1.9 km。这些估算值与相交岩浆的估算值仅相差0.2-0.5 km,表明流纹岩- melt为极浅岩浆储存提供了极好的估算值,蒙特卡罗分析结果进一步加强了这一点。流纹岩-熔融体压力与Krafla岩浆的钻探深度之间的一致性支持了之前在其他地方计算的非常浅的储存压力,如新西兰Aotearoa的陶普火山带(TVZ)。这一最浅的熔岩储存带对火山不稳定的模拟和地热资源和经济资源潜力的评估具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shallow storage conditions at Krafla IDDP-1 revealed by rhyolite-MELTS geobarometry, and implications for global shallow magmatism
Identifying the storage depths of melt-dominated magma bodies prior to eruption is critical for understanding magma transport, eruption hazards, and magma body longevity. Rhyolite-MELTS has been used effectively to calculate pre-eruptive storage pressures for silicic magma bodies in the upper crust (∼100–350 MPa), but its precision and accuracy in very low-pressure systems (<100 MPa) has not been sufficiently investigated. During the 2009 Krafla IDDP-1 drilling project, magma was surprisingly intersected at 2.1 km depth. Here, we test the use of rhyolite-MELTS geobarometry for this very low-pressure system, using natural Krafla IDDP-1 compositions that were intersected at a known depth. We input the composition of the melt (preserved as glass) and search in pressure and temperature and oxygen fugacity (fO2) spaces to model the storage conditions of the Krafla magma. For the average composition of the drilled glass, rhyolite-MELTS yields reasonable storage pressures (∼40–50 MPa). After converting calculated pressure to depth, the calculated depths are 1.6–1.9 km. These estimates are only 0.2–0.5 km different from that of the intersected magma, showing that rhyolite-MELTS provides excellent estimates for very shallow magma storage, further strengthened by results from a Monte Carlo analysis. The agreement between rhyolite-MELTS pressures and the drilled depth of the Krafla magma supports the previously calculated very shallow storage pressures in other locations, like the Taupō Volcanic Zone (TVZ), Aotearoa New Zealand. This shallowest storage zone of melt-dominated magmas has significant implications for modeling volcanic unrest and evaluating geothermal and economic resource potential.
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来源期刊
Earth and Planetary Science Letters
Earth and Planetary Science Letters 地学-地球化学与地球物理
CiteScore
10.30
自引率
5.70%
发文量
475
审稿时长
2.8 months
期刊介绍: Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.
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