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A-型花岗岩,是查佩尔在澳大利亚继S-型和I-型之后建立的另一种类型,其含义是非造山的、无水的、碱性的。我所及区调七分队新近在滇西地区已经确定有这种类型的存在。木厂岩体就是一个典型。木厂岩体位于保山复向斜南部,柯街断裂南端西侧,面积约8平方公里,为一侵入于二迭系的碱性花岗岩岩株,围岩显轻微热变质。岩石为粒状花岗结构及文象花岗结构。主要矿物成分:石英25—28％,钾长石45—50％,
A-type granite is another type of Chaplet established after S-type and I-type in Australia, which means non-orogenic, anhydrous and alkaline. I recently moved in the western region of Yunnan Province and I have identified this type of existence. Wood factory rock is a typical. The wooden factory rock mass is located in the south of Baoshan synclinorium and west of the south end of Kejie fault. It covers an area of about 8 square kilometers and is an alkaline granite rock intrusion into the Permian system. The surrounding rock shows slight thermal deterioration. The rock is granular granite structure and textual granite structure. The main mineral composition: quartz 25-28%, 45-50% potassium feldspar,