a lost world populated by fanged frogs, grunting fish and tiny bear-like creatures has been discovered in a remote volcanic crater on the pacific island of papua new guinea.
the diatreme breccia pipes belong to volcanic crater phase and volcanic conduit phase, and consist of breccias and binding material.
爆破角砾巖筒属火山口相和火山管道相,脉巖属次火山相。
the fractures radiating from the volcanic crater are the ore-distributing passageways, which let the ore-forming material move into the host structures and the deposit.