西澳大利亚的前寒武纪地盾包括北部的太古宙皮尔巴拉克拉通和南部较年轻的伊尔冈克拉通,它们中间以元古宙的梅迪安(Modian)带分开,古地磁资料说明克拉通在其目前相对位置上存在至少2400Ma,为地盾发展提出的一些模式表明:一种简单的、稳定的太古宙克拉通是在整个地区形成的。后来,不是发生了断裂就是塌陷而形成了加斯科尼省和梅迪安带。沿着皮尔巴拉地块东部做的地震反射剖面,说明地壳北部厚28公里,南部厚33公 Precambrian shields in Western Australia include the Arctic Pilbara Craton in the north and the younger Irgang Craton in the south, separated by the Proterozoic Modian belt, paleomagnetic descriptions The craton has at least 2400 Ma in its current relative position. Some models proposed for the development of the earth shield indicate that a simple, stable Archean craton is formed throughout the region. Later, either the collapse or the collapse led to the formation of the provinces of Gasconi and Median. Seismic reflection profiles along the east of the Pilbara Massif indicate that the northern part of the crust is 28 km thick and the southern part is 33 km thick