The Kamo Volcanic Field (KVF), a partly preserved Quaternary volcanic sequence of three small-volume basaltic volcanoes located about 10 km northwest of the Aira caldera in the Kagoshima graben in southwestern Kyushu, Japan. It forms part of the volcanic arc of Japan and consists of the Late Pleistocene Aojiki volcano and two Holocene maars: Sumiyoshiike and Yonemaru. Here, we report the first results of a combined lithostratigraphic and petrogenetic study of these three volcanoes. Eruptive products of Aojiki volcano comprise an initial scoriaceous tephra, a lava flow and scoria fall from the cone. Sumiyoshiike and Yonemaru maar products are mainly scoria fall and pyroclastic surge deposits, which are closely related in time and were principally emplaced by phreatomagmatic explosive eruptions. Major and trace element data of the eruptive products suggest four groups of magmas. Aojiki scoria (G1: SiO₂=50.3-51.4) are the most evolved, followed by Aojiki tephra/lava (G2: SiO₂ =48.1-50.7), while Sumiyoshiike (G3: SiO₂ =47.0-48. 5) and Yonemaru (G4: SiO₂=46.3-48.5) are relatively less evolved. These magmas are derived from the same spinel bearing (lithospheric) mantle source previously metasomatized by subducting fluids and might have evolved in independent magma chambers mainly by fractional crystallization and crustal contamination except for G1 magma which may have suffered some associated mixing.

Kamo火山场（KVF）是部分保存完好的第四纪火山序列，由三个小体积的玄武岩火山组成，位于日本九州西南部鹿儿岛火山口Aira破火山口西北约10公里处。它是日本火山弧的一部分，由晚更新世青奥基火山和两个全新世玛乌斯组成：住吉池和米丸。在这里，我们报告这三个火山岩相地层学和岩石成因研究的初步结果。Aojiki火山的火山喷发产物包括最初的针状特非拉火山，熔岩流和从圆锥体坠落的火山灰。Sumiyoshiike和Yonemaru maar的产品主要是火山灰下降和火山碎屑潮沉积物，它们在时间上密切相关，并且主要是由岩浆爆发性爆发形成的。火山喷发产物的主要和微量元素数据表明有四类岩浆。最易演化的是Aojiki scoria（G1：SiO ₂ = 50.3-51.4），其次是Aojiki tephra / lava（G2：SiO ₂ = 48.1-50.7），而Sumiyoshiike（G3：SiO ₂ = 47.0-48。5）和Yonemaru （G4：SiO ₂＝ 46.3-48.5）的析出相对较少。这些岩浆来自相同的尖晶石（岩石圈）地幔源，该源先前已被俯冲流体交代，并且可能在独立的岩浆室中演化，主要是通过分步结晶和地壳污染引起的，但G1岩浆可能受到了一些相关的混合作用。