论文部分内容阅读
皮尔巴拉地块位于澳大利亚西北部,面积60,000平方公里,这里有一些世界上最老的(3500Ma)并且出露最好的太古宙岩层。花岗岩形成了100公里宽的卵形岩基,构成该地块约60％,可分为三种主要类型:1)混合岩,片麻岩和叶片状石英二长岩,花岗闪长岩和钠质花岗岩,年龄从至少3400Ma到约2900Ma。2)不同年龄的叶片状斑状石英二长岩和花岗闪长岩,但以3000Ma的为主。3)年龄为2700—2600Ma的构造运
Pilbara Plot is located in the northwestern Australia, an area of 60,000 square kilometers, there are some of the world’s oldest (3500Ma) and revealed the best Archean rock formation. Granite forms a 100-kilometer-wide oval-shaped rock mass that forms about 60% of the block and can be divided into three main types: 1) mixed rock, gneiss and vaulted quartz monzonite, granodiorite and Na-granite, ages from at least 3400Ma to about 2900Ma. 2) Leaf-shaped porphyritic monzogranite and granodiorite of different ages, but dominated by 3000Ma. 3) Construction age of 2700-2600Ma