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作者在研究云南姚安碱性岩的过程中,发现辉石黑云母正长斑岩和黑云母正长斑岩中正长石斑晶的环带构造广泛发育。正长石的环带构造较之斜长石和钾长石的环带构造极为罕见,研究得很少。对正长石环带的研究,能够提供很多关于岩浆结晶作用和演化方面的有用资料。 一、姚安碱性岩体的一般地质特征 岩体产于点苍山—哀牢山及秀水河—绿潜江断裂带附近的次级构造中,略呈北东向断续出露,成为长达140—150公里的岩带,姚安岩体位于岩带的东北端,出露面积约20
During the study of the alkaline rocks in Yaonian, Yunnan Province, the authors found that the zonal structure of the orthoclase phenocrysts in the pyroxene bimatoporphyrite and biotite-orthoclase porphyries has been widely developed. The zonal structure of the orthoclase is extremely rare and rarely studied compared with the zonal structure of plagioclase and potash feldspar. Research on the feldspathic anomaly can provide a lot of useful information on the crystallization and evolution of magma. I. GENERAL GEOLOGICAL CHARACTERISTICS OF THE YAO AN BASIC ROCKS The rock mass is produced in the secondary structure near Diancangshan-Ailao-Shan and Xiushuihe-Lvqianjiang faults, Up to 140-150 km of rock belt, Yao An rock body is located in the northeast end of rock belt, exposing an area of about 20