Petrological study on the voluminous pyroclastic eruptions from triple or more magma chambers

对南台火山晚期喷发（约17000年前）和Numasawako火山喷发（公元前3400年）火山碎屑产物的岩石学研究表明，这两次大规模火山碎屑喷发是由独立的多个岩浆房的岩浆混合产生的。两个英英质岩浆房形成于晚喷发前，在独立的基性岩浆房岩浆侵入后爆发。在Numasawako火山喷发前大约2万年，形成了单一的英质岩浆房，最初的撞击产生了熔岩穹窿。然后，这个英质岩浆室的爆炸发生在两个基因无关的基性岩浆连续补充之后，这两个岩浆室分别来自独立的岩浆室。

Petrological investigation on the pyroclastic products of the Late stage eruption (ca 17,000 years ago) of Nantai volcano and the Numasawako eruption (BC 3,400 years) of Numasawa volcano shows that the two voluminous pyroclastic eruptions have been generated by mixing between magmas from the independent, multiple magma chambers. Two dacitic magma chambers were formed just prior to the Late stage eruption, and they tapped explosively after the invasions of magmas from the independent mafic magma chambers. Approximately 20,000 years before the Numasawako eruption, single dacitic magma chamber was formed, and the initial tapping of the chamber generated lava dome. Then, the explosive tapping of this dacitic chamber occurred just after the sequential replenishments of two genetically-unrelated mafic magmas that were supplied from the independent magma chambers.