Fumarolic gases at Mombacho volcano (Nicaragua): presence of magmatic gas species and implications for volcanic surveillance

Fumarolic gases at Mombacho volcano (Nicaragua): presence of magmatic gas species and implications for volcanic surveillance
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蒙巴乔火山(尼加拉瓜)的喷气孔气体:岩浆气体种类的存在及其对火山监测的影响

DOI:
10.1007/s00445-006-0108-z
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发表时间:
2007
影响因子:
3.5
通讯作者:
Strauch W
Strauch W
中科院分区:
地球科学3区
文献类型:
--
作者:
Garofalo K;Tassi F;Vaselli O;Delgado-Huertas A;Tedesco D;Frische M;Hansteen TH;Poreda RJ;Strauch W

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蒙巴乔火山是尼加拉瓜第四纪火山链的一个深解剖火山。南部,历史上的塌陷陨石坑(El crater)目前拥有一个最高温度为121°C的火山喷发场。2002年、2003年和2005年进行的5次野外气体取样的化学和同位素数据强调了高温气体组分(如SO2、HCl和HF)的存在,这表明幼年岩浆流体对热液系统的重要贡献,为气体排放提供了补给。地幔源氦和碳同位素特征有力地支持了这一点,尽管后者部分被沉积俯冲或浅层碳酸盐成分所掩盖。观察到的Mombacho流体的化学和同位素组成似乎表明,这个火山系统虽然在过去几个世纪中没有经历过喷发事件,但与该地区记录的地球物理数据一致,可以被认为是活跃的,可能是危险的。强烈建议对富马罗烷气体排放进行系统的地球化学监测,并结合地震和地面变形网,以便监测可能的新喷发阶段。
Mombacho is a deeply dissected volcano belonging to the Quaternary volcanic chain of Nicaragua. The southern, historic collapse crater (El Crater) currently hosts a fumarolic field with a maximum temperature of 121°C. Chemical and isotopic data from five gas-sampling field campaigns carried out in 2002, 2003 and 2005 highlight the presence of high-temperature gas components (e.g. SO2, HCl and HF), which indicate a significant contribution of juvenile magmatic fluids to the hydrothermal system feeding the gas discharges. This is strongly supported by the mantle-derived helium and carbon isotopic signatures, although the latter is partly masked by either a sedimentary subduction-related or a shallow carbonate component. The observed chemical and isotopic composition of the Mombacho fluids seems to indicate that this volcanic system, although it has not experienced eruptive events during the last centuries, can be considered active and possibly dangerous, in agreement with the geophysical data recorded in the region. Systematic geochemical monitoring of the fumarolic gas discharges, coupled with a seismic and ground deformation network, is highly recommended in order to monitor a possible new eruptive phase.
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