莱阳——带堇青石的点滴研究

STUDY ON THE CORDIERITES IN THE LAIYANG REGION

摘要:

本文所谈的堇青石分布于莱阳市以北,旌旗山及其以东一带的变质岩系中。其层位属荆山群禄格庄组下段(图1),按原805队的划分属胶东群民山组第二段。因为本区的堇青石多遭受了后期的变化,过去常被人们所忽视。但无论含堇青石的岩石在本区禄格庄组下段的矿物组合,还是堇青石对研究产出地层的变质条件和变质历史等方面都占有重要的地位,因而应当引起人们的关注和研究。

Abstract:

In this paper, the writer described the cordierite-bearing rock associations and its characteristics, the characteristics of the cordierites and its changes in the progressive metamorphism and retrograde metamorphism, as well as metamorphic mineral assemblages in the Laiyang region. Then the approximate P—T ranges for the formation of the three generations of the metamorphic mineral assemblages on the P—T diagram for metamorphic facies series were determined according to the mineral associations—the forming...