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阿贡火山和巴都尔火山的多级岩浆管道系统增加了危险喷发的风险。

Multi-level magma plumbing at Agung and Batur volcanoes increases risk of hazardous eruptions.

作者信息

Geiger Harri, Troll Valentin R, Jolis Ester M, Deegan Frances M, Harris Chris, Hilton David R, Freda Carmela

机构信息

Section for Mineralogy, Petrology and Tectonics, Department of Earth Sciences, Uppsala University, Uppsala, Sweden.

Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy.

出版信息

Sci Rep. 2018 Jul 12;8(1):10547. doi: 10.1038/s41598-018-28125-2.

DOI:10.1038/s41598-018-28125-2
PMID:30002471
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6043508/
Abstract

The island of Bali in Indonesia is home to two active stratovolcanoes, Agung and Batur, but relatively little is known of their underlying magma plumbing systems. Here we define magma storage depths and isotopic evolution of the 1963 and 1974 eruptions using mineral-melt equilibrium thermobarometry and oxygen and helium isotopes in mineral separates. Olivine crystallised from a primitive magma and has average δO values of 4.8‰. Clinopyroxene records magma storage at the crust-mantle boundary, and displays mantle-like isotope values for Helium (8.62 R) and δO (5.0-5.8‰). Plagioclase reveals crystallisation in upper crustal storage reservoirs and shows δO values of 5.5-6.4‰. Our new thermobarometry and isotope data thus corroborate earlier seismic and InSAR studies that inferred upper crustal magma storage in the region. This type of multi-level plumbing architecture could drive replenishing magma to rapid volatile saturation, thus increasing the likelihood of explosive eruptions and the consequent hazard potential for the population of Bali.

摘要

印度尼西亚的巴厘岛有两座活层状火山，阿贡火山和巴都尔火山，但人们对其潜在的岩浆管道系统了解相对较少。在此，我们利用矿物-熔体平衡热压测定法以及矿物分离物中的氧和氦同位素，确定了1963年和1974年火山喷发的岩浆储存深度及同位素演化情况。橄榄石由原始岩浆结晶而成，平均δO值为4.8‰。单斜辉石记录了在地壳-地幔边界的岩浆储存情况，并显示出类似地幔的氦同位素值（8.62 R）和δO值（5.0 - 5.8‰）。斜长石显示出在上地壳储层中的结晶情况，δO值为5.5 - 6.4‰。因此，我们新的热压测定法和同位素数据证实了早期的地震和合成孔径雷达干涉测量研究，这些研究推断该地区存在上地壳岩浆储存。这种多层次的管道结构可能会促使补充岩浆迅速达到挥发物饱和状态，从而增加爆发性火山喷发的可能性以及对巴厘岛居民造成的潜在危害。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/7ec94415dd1d/41598_2018_28125_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/ec493f6c84c0/41598_2018_28125_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/1aa6ab4e8e3d/41598_2018_28125_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/a29609f20a88/41598_2018_28125_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/84dbabdad3a5/41598_2018_28125_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/e689fedc1633/41598_2018_28125_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/54e1b7f2d902/41598_2018_28125_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/7ec94415dd1d/41598_2018_28125_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/ec493f6c84c0/41598_2018_28125_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/1aa6ab4e8e3d/41598_2018_28125_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/a29609f20a88/41598_2018_28125_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/84dbabdad3a5/41598_2018_28125_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/e689fedc1633/41598_2018_28125_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/54e1b7f2d902/41598_2018_28125_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0949/6043508/7ec94415dd1d/41598_2018_28125_Fig7_HTML.jpg

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引用本文的文献

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2
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Sci Rep. 2019 Jun 20;9(1):8848. doi: 10.1038/s41598-019-45295-9.
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Dyke intrusion between neighbouring arc volcanoes responsible for 2017 pre-eruptive seismic swarm at Agung.

本文引用的文献

1
Locating the depth of magma supply for volcanic eruptions, insights from Mt. Cameroon.定位火山喷发的岩浆补给深度，喀麦隆山的新见解。
Sci Rep. 2016 Oct 7;6:33629. doi: 10.1038/srep33629.
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Intrusion triggering of the 2010 Eyjafjallajökull explosive eruption.2010 年艾雅法拉火山喷发的侵入触发。
Nature. 2010 Nov 18;468(7322):426-30. doi: 10.1038/nature09558.
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Water and the oxidation state of subduction zone magmas.水与俯冲带岩浆的氧化态
相邻火山弧之间的岩墙侵入是造成 2017 年阿贡火山喷发前地震群的原因。
Nat Commun. 2019 Feb 14;10(1):748. doi: 10.1038/s41467-019-08564-9.
Science. 2009 Jul 31;325(5940):605-7. doi: 10.1126/science.1174156.