摘要
首次发现滇西新生代碱性火山岩、富碱斑岩中存在深源的碱性超基性基性岩， 还有前人报道的常见超镁铁质岩， 岩石类型有碱性辉石岩、碱性辉长岩、无辉斜长岩、正长斜长岩。系统研究了此两种岩类的产状、岩石学、岩石化学及成因机理， 认为碱性岩和辉石岩是代表富集地幔顶部， 由二辉橄榄岩部分熔融形成的碱性超基性基性岩和钙碱性岩岩片和楔形体。
In West Yunnan, there are the hypogenic alkalic ultrabasic basic rocks discovered first in the Cenozoic alkalic volcanics and rich alkali porphyry, and ordinary ultramafic rocks reported before, including alkalic pyroxenite, alkalic gabbro, pyroxene free plagioclasite and orthoclase plagioclasite. After a systematic study of their occurrences, petrography, petrochemistry and genetic mechanism of them, we think that the alkalic rock and pyroxenite are the representatives of rock slice and wedge rich in alkalic ultrabasic-basic and calc alkalic rocks formed by partial melting of the lherzolite in the top mantle.
出处
《云南地质》
1999年第2期127-143,共17页
Yunnan Geology
