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

对南台火山晚期喷发（约17,000年前）和沼泽火山沼泽湖喷发（公元前3,400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多个独立岩浆房的岩浆混合而成的。晚火山爆发前形成两个英安质岩浆房，在独立的镁铁质岩浆房侵入后，两个岩浆房发生了爆炸性的喷发。在沼泽湖火山爆发前约20，000年，形成了单一的英安质岩浆房，最初的挖掘产生了熔岩圆顶。然后，这个英安质岩浆房的爆炸性轻敲发生在两个成因无关的镁铁质岩浆，从独立的岩浆房供应的顺序结束后。

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.