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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Evidence for a recent change in the shallow plumbing system of Mt. Etna (Italy): Gas geochemistry and structural data during 2001-2005
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Evidence for a recent change in the shallow plumbing system of Mt. Etna (Italy): Gas geochemistry and structural data during 2001-2005

机译：有证据表明，山的浅水管道系统最近发生了变化。埃特纳火山（意大利）：2001-2005年间的天然气地球化学和结构数据

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摘要

We analyzed crater SO_2 fluxes from Mt Etna, together with soil CO_2 effluxes from the volcano's flanks, in the period from 2001 to 2005. Between the 2001 and 2002-2003 eruptions, persistently low values of both parameters suggest that no new gas-rich magma was accumulating at shallow depth (<5 km) within Etna's central conduit, whereas very high SO_2 sin-eruptive fluxes during the two eruptions indicated sudden decompression of an un-degassed magma rising along newly-formed eccentric conduits. In November 2003, soil CO_2 data indicate migration of gas-rich magma from deep (> 10 km) to shallow (<5 km) portions of the feeding conduits, preceded by an increase in crater SO_2 fluxes. A similar behavior was observed also during and after the following 2004-2005 eruption. This degassing style matches a period of increased structural instability of the volcanic edifice caused by acceleration of spreading that affected both its eastern and southern flanks. Spreading could have triggered progressively deeper depressurization in the central conduit, inducing release of the more soluble gas (SO_2) first, and then of CO_2, contrary to what was observed before the 2001 eruption. This suggests that the edifice has depressurized, promoting ascent of fresh-magma and increasing permeability favouring release of CO_2 flux. By integrating geochemical and structural data, previous degassing models developed at Mt. Etna have been updated to advance the understanding of eruptive events that occurred in recent years.
机译：我们分析了2001年至2005年期间来自埃特纳火山的火山口SO_2通量，以及火山侧面的土壤CO_2排放量。在2001年至2002-2003年爆发期间，两个参数的持续低值表明没有新的富天然气岩浆是在埃特纳火山中央管道内的浅深度（<5 km）聚集，而在两次喷发期间非常高的SO_2正喷发通量表明，沿新形成的偏心管道上升的未脱气岩浆突然减压。 2003年11月，土壤CO_2数据表明，富含天然气的岩浆从进料管道的深部（> 10 km）迁移到浅部（<5 km），随后火山口SO_2通量增加。在随后的2004-2005年喷发期间和之后，也观察到了类似的行为。这种除气方式与一段时间内火山建筑物结构不稳定性的增加有关，后者是由于扩展速度加快而影响了其东部和南部两侧。与2001年喷发之前所观察到的情况相反，扩散可能触发了中央导管中逐渐更深的降压，首先导致释放出更易溶的气体（SO_2），然后释放出CO_2。这表明大厦已经降压，促进了新鲜岩浆的上升并增加了渗透性，有利于释放CO_2通量。通过整合地球化学和结构数据，以前在Mt.山开发了脱气模型。 Etna已更新，以增进对近年来发生的爆发事件的了解。

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