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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Volatile flux from subduction zone volcanoes: Insights from a detailed evaluation of the fluxes from volcanoes in Japan
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Volatile flux from subduction zone volcanoes: Insights from a detailed evaluation of the fluxes from volcanoes in Japan

机译：俯冲带火山喷发的挥发性通量：对日本火山喷发性的详细评估得出的见解

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摘要

Global volatile fluxes from subaerial volcanoes at subduction zones were estimated based on a compilation of fluxes from various sources, including persistent degassing, hot and cold springs, soil degassing, and eruptions. Because worldwide comprehensive datasets are not available, especially for diffuse volatile discharges, volatile fluxes from Japan arcs were estimated based on detailed datasets, and the regional fluxes were extrapolated to the global flux with consideration of the regional characteristics of volcanic volatile compositions, which were estimated based on volcanic gas compositions of persistent degassing. The estimated global fluxes indicate that persistent degassing is the major source of volatiles, especially for S with a contribution of 80%. Diffuse discharges and persistent degassing are similarly important sources of H_2O, CO_2, and Cl, but the contribution of explosive eruptions is less than 15% for all the volatiles. The estimates of diffuse degassing fluxes include large errors due to limited data. However, the potential impact of these sources on the global flux indicates the importance of further studies to quantify these fluxes. The volatile budget of subduction zone volcanism was evaluated by comparing the estimated volatile fluxes, the volatile contents in the crust, and the primitive magma volatile contents. The contribution of volatiles remaining in the crust are not significant; however, consideration of lower crust foundering significantly alters the volatile budget estimate because the primitive magma supply rate should be significantly increased to account for the lower crust foundering.
机译：根据俯冲带地下火山的总体挥发性通量，是根据各种来源的通量汇编而估算出来的，这些通量包括持续除气，温泉和冷泉，土壤除气和喷发。因为没有全球范围内的综合数据集，尤其是对于弥散性挥发性物质的排放，因此基于详细的数据集估算了日本电弧的挥发性通量，并且考虑了火山挥发性成分的区域特征，将区域通量外推至全球通量。基于持续脱气的火山气成分。估计的全球通量表明，持续脱气是挥发物的主要来源，特别是对于S而言，占80％。扩散排放和持续脱气也是H_2O，CO_2和Cl的重要来源，但所有挥发物的爆炸爆发贡献均不到15％。由于数据有限，扩散脱气通量的估计值包括很大的误差。但是，这些来源对全球通量的潜在影响表明了进一步研究以量化这些通量的重要性。通过比较估算的挥发性通量，地壳中的挥发性成分和原始岩浆的挥发性成分，对俯冲带火山岩的挥发性预算进行了评估。残留在地壳中的挥发物的贡献不大；然而，考虑到较低的地壳沉没，考虑到较低的地壳沉陷会显着改变可变预算估计，因为原始岩浆供应率应显着提高。

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