Hyalophane-bearing gneiss in north china craton and its geological implication

摘要

The hyalophane-bearing gneiss is a kind of rare rock in North China craton. It was found in Qianlishan group of Inner Mongolia and Caozhuang Complex of east Hebei. There are deferent mineral assemblages in the two places: hyalophane +quartz + magnet + albite + diopside in Qanlishan Group; hyal + plagioclase + quartz + biotite + hornblende in Caozhuang Comples. In Caozhuang Comple the hyalophane -bearing rock the Ba content is higher than 2/100 wt for whole rock, and 6/100 for hyalophane.