福建华安玉的矿物学特征及成因研究

通过福建华安玉野外地质观察、室内显微镜下观察、矿物电子探针分析和X射线粉末衍射分析,研究了华安玉的结构构造和矿物组成,结果表明: 华安玉显示出不同艳丽的条带,实质上是不同矿物分带的体现,绿-墨绿色条带主要由铁次透辉石组成,红色或淡肉红色条带主要由钾长石组成,灰白色或乳白色条带主要由石英、方解石等矿物组成。并对华安玉的形成构造环境和成因进行了初步研究,认为其形成于被动大陆边缘的潮坪泻湖环境,原岩主要是钙质粉砂岩、泥灰岩、硅质岩等,燕山期强烈的构造岩浆活动对其进行了多期热接触变质或交代作用,钙质粉砂岩、泥灰岩、硅质岩等经变质成为透辉石角岩。

Mineralogical characteristics and genesis of Hua'an Jade in Fujian Province

Field geological observation, microscopic observation, electron microprobe analysis and X-ray diffraction patterns of the Hua''an Jade indicate that the green stripes of Hua''an Jade are formed by diopside, the red stripes are formed by K-feldspar, and the white stripes are formed by quartz and calcite. Based on a study of tectonic setting, original rocks and genesis of Hua''an Jade, the authors have found that Hua''an Jade was formed in surrounding areas of the lagoon-tidal flat on the edge of the passive continent, and the original rocks are mainly made up of calcareous sandstone, mudstone and siliceous rocks. The Hua''an Jade hornfels was formed by multi-phase thermal contact metamorphism and metasomatism of Yanshanian magmatic activity.