Abstract:

The results of detailed investigation on the chemical and isotopic compositions of subsurface fluids in Northern Hainan Quaternary volcanic region indicate that the Maanling and Leihuling volcanoes would be the dormant volcanoes, and great attention should be continuously paid to them. Near the Maanling crater the sodium content of underground water is anomalously higher, and also the releasing activity of deep-seated CO 2 is visible. Moreover, the determined results of hydrogen and oxygen isotopic compo

Key words: Northern Hainan volcanic region, subsurface fluid, geochemistry, volcanic hazard assessment

摘要：

琼北火山区地下流体地球化学调查结果显示 ,目前马鞍岭火山附近较大范围内深层地下水仍有一定强度的深源CO2 释放活动 ,火山口附近地下水的Na含量也相对偏高。地球化学异常指示马鞍岭、雷虎岭等火山可能仍属于休眠火山 ,应继续关注。但从整体上看 ,琼北火山区深源流体释放活动的强度较弱 ,因此区内近期尚没有火山喷发活动的危险

关键词: 琼北火山区, 地下流体, 地球化学, 火山喷发危险性评估