梅岭玉地质特征及成因探讨

介绍江苏省梅岭玉（软玉）矿床的地特征,通过野外调查,室内镜下观察、化学分析、光谱分析、电镜分析、Ｘ射红衍射分析,电子探针定量分析等综合研究后认为：梅岭玉是透闪石族的软玉,有白玉、青白玉、青玉等不同的品种。矿床是多成因形成的;其中以透闪石矿物为主物的梅岭白玉是接触交代变质作用形成的,以钠透闪石矿物为主的青玉形成较虹,是由“玉浆”贯入后,在低压高温下的迅速冷凝形成的。

STUDY ON THE GEOLOGICAL CHARACTERISTICS AND GENESIS OF MEILING JADE

This paper introduces the geological characteristics of Meiling Jade deposit in Jiangshu Provice. Investigation in field and observation under microscope are made. The test methods of spectrum, electron microscope, X ray diffraction and electron probe analysis are adopted. The results show that Meiling Jade, which has varieties of White Jade, Black white Jade and Black Jade, is the nephrite jade of tremolite mineral group. The deposit of Meiling Jade has the characteristic of multi genetic origin. Meiling White Jade, Which is composed of tremolite mainly, was formed by metasomatism and metamorphism in contact zone. Meiling Black Jade, which consists of soda tremolite mainly, was formed by cooling following injection of "Jade pulp" under low pressure and high temperature.