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首页> 外文期刊>Earth, planets and space: EPS >The 1997 phreatic eruption of Akita-Yakeyama volcano, northeast Japan: Insight into the hydrothermal processes
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The 1997 phreatic eruption of Akita-Yakeyama volcano, northeast Japan: Insight into the hydrothermal processes

机译：1997年日本东北秋田-八岳山火山的潜水爆发：对热液过程的认识

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A small-scale steam explosion occurred on Karanuma crater on the summit of Akita-Yakeyama volcano on August 16, 1997 after a dormancy of 46 years. Chemical compositions of the fumarolic gases at the summit and hot spring waters around the volcano were monitored before the eruption. Obvious changes in the composition and outlet temperatures of the fumarolic gases were not detected, neither before nor after the 1997 eruption. Hydrogen and oxygen isotopic ratios of the gas condensates and hot-spring waters at the Yunuma crater indicated that a hydrothermal reservoir, where the fumarolic gases separated from the hot-spring waters at 150circC, existed in a shallow place beneath the crater. Smectite, kaolinite and pyrophyllite were identified in the clay fraction of the volcanic ejecta. Although pyrophyllite should have been formed at about 1~km beneath the summit, it was not directly derived from the deep zone during the 1997 eruption but had been ejected by previous eruptions. The Cl/S values of the water leachates of the ejecta were about 0.7, which indicated that the volcanic gas which caused the eruption was rich in HCl. However, the fumarolic gases and the water samples collected from the summit area contained little chloride. The source of the water-soluble chloride might be high-temperature magmatic gases that have been estimated as the source of Cl-SO4 type thermal water. Such magmatic gases might have caused the 1997 eruption.
机译：休眠46年后的1997年8月16日，在秋田-岳山火山顶上的Karanuma火山口发生了一次小型蒸汽爆炸。在喷发之前，对火山顶峰和火山水附近的富马酸类气体的化学成分进行了监测。在1997年喷发之前或之后，均未检测到富马酸气体的成分和出口温度发生明显变化。尤努玛火山口处的气体冷凝物和温泉水的氢氧同位素比表明，在火山口下方的浅处存在一个热液储层，富马酸类气体在150摄氏度时与温泉水分离。在火山喷出物的粘土级分中鉴定出了蒙脱石，高岭石和叶蜡石。尽管叶蜡石应该在山顶以下约1公里处形成，但它并不是在1997年的喷发中直接来自深部地区，而是先前的喷发喷出的。喷出物的水浸出液的Cl / S值约为0.7，表明引起喷发的火山气体富含HCl。但是，从峰顶区域收集的富马酸气体和水样中几乎不含氯化物。水溶性氯化物的来源可能是高温岩浆气体，据估计是Cl-SO 4 型热水的来源。这种岩浆气体可能引起了1997年的喷发。

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