西澳大利亚东皮尔巴拉地块的太古宙(大约3450Ma)瓦拉沃纳群,含有一些已知最老而保存良好的火山岩岩层。在凯利绿岩带和麦卡菲(Mcphee)穹窿,是经过很小变形和浅变质的火山岩,在大约450平方公里面积的地区上出露良好。这是一个关键的地区,其中瓦拉沃纳群的成分之间的关系,对为其演化提出的模式起了抑制作用。瓦拉沃纳群的变质火山岩,根据其不同的结构和矿物成分,可以划分为三个群。虽 Archaean (about 3450Ma) Havanaña, in the Eastern Pilbara Massive Western Australia, contains some of the oldest and most well-preserved volcanic rock formations. The Kelly Greenstone Belt and the McPhee Dome are small deformed and metamorphosed volcanic rocks that show well in areas of approximately 450 square kilometers. This is a crucial area where the relations among the components of the Varavona group have inhibited the model proposed for their evolution. The metamorphic volcanic rocks of the Wawanna Warren can be divided into three groups according to their different structures and mineralogical compositions. although