湘黔汞矿带中的黑辰砂和硒汞矿

黑辰砂和硒汞矿是HgS-HgSe系列的端员矿物。黑辰砂产于湘黔汞矿带大洞喇、纸坊、茶田汞矿床,硒汞矿产于新晃汞矿床外围的蚀变石英岩中。本文通过对黑辰砂和硒汞矿的物理光学性质、化学成分、X光衍射及红外吸收光谱的研究,表明这两个矿物上述诸方面特征均很相似,但又表现出有规律的变化。

Metacinnabar and Tiemannite in Hunan-Guizhou (Xiangqian) Mercury Metallogenic Belt

Metacinnabar and tiemannite are e.nd members of HgS-HgSe series, In meta- cinnabar, selenium is often seen in place of sulfur, and zinc in place of mercury;in tiemannite, sulfur is frequently in place of selenium. Like minerals in many isomorphous series, these two minerals are quite similar to each other and show regular variation in physical-optical properties, X-ray diffraction patterns and infrared absorption spectra. Metacinnabar, which is associated with such sulfides as cinnabar and sphale- rite, was formed in a sulfides-rich environment at fairly low temperature (190- 220''C). Tiemannite is associated only with quartz without such sulfides as sphalerite and cinnabar; it w as therefore for med in a sulfides-poor environ went at a bit higher to mperature (230-265''C).