目前,伊豆和小笠原弧的面貌类似于约15百万年前西黑泽期的东北日本弧。位于伊豆和小笠原北部火山前沿后部的弧后凹地是被正断层切割而形成的沉降性凹地。该弧后凹地可能有热液活动。进而,本文将它与在东北日本弧北鹿区域所形成的黑矿矿床条件的类似性进行了比较和研究。 Currently, the arc of the Izu and Ogasawara arcs look similar to the Northeast Japan arc of Western Hemisphere about 15 million years ago. The posterior cavern, located in the back of the volcanic front in northern Izu and Ogasawara, is a subsidence depression formed by normal-fault cutting. The arc may have hydrothermal activity. Furthermore, this paper compares and studies the similarities of the conditions of the black-mineral deposits formed in the arc northern Deer area in northeastern Japan.