对前寒武纪钾长浅粒岩层的一点认识

RECOGNITION ON PRECAMBRIAN K-FELDSPAR LEUCOGRANULITITE

摘要: 在前寒武纪变质岩系中的钾长浅粒岩,岩层厚度不大,但出露层位稳定,分布范围广,可以作为前寒武纪变质岩系的标志层之一。文章初步总结了它的野外鉴别特征、矿物及化学成份,认为是典型的沉积变质岩石。

Abstract: K-feldspar leuco-granulitite in Precambrian metamorphic rock series is not quite thick, but the stratigraphic horizon of its exposure is persistent and its areal extent is wide. This paper preliminarily summarizes its field features, mineral composition and chemical composition, and considers that it is a kind of typical metasedimentary rock. Therefore the author suggests that the K-feldspar leuco-granulitite may serve as one of the key beds of the Precambrian metamorphic rock series.