摘要
本文从物理性质和化学成分等方面对东升庙矿区的石榴石进行了标型特征研究.石榴石具罕见的放射状"太阳晶".石榴石中锰的含量及Mn/Fe比值与矿化强弱程度一致,从围岩到矿体Mn/Fe比值渐增,晶胞参数变小,晶形由{211}过度到以{110}为主,由裼红色转变为灰白色.石榴石具有典型的找矿矿物标型意义.进而讨论了本区石榴石的成因,认为高锰石榴石的形成可能与海底喷气热液自交代作用有关.
Dongshengmiao polymetallic sulfide deposit is one of the superscale sulfide deposits developed within the polymetallic mineralization belt along the northern margin of north china platform. The minerals of garnet group developed in the mining area, have a close relation to mineralization、So the present paper deals with them and gives their typomorphic characters with respect to chemical compositions and physical properties. The garnet minerals reveal an unique radial (similar to the light of the sun) crytal texture, tending to be high in Mn and low in Mg and Ca. The Mn content and Mn/Fe ratio vary as a function of mineralization, as indicated by the progressive increase in the Mn/Fe from 0.9 in the country rocks to 4.05 near the ore bodies、With these changes, the crystal forms also transit from (211) to (110), the unit cell parameter ? from long to short, and the crystal colours from brown red to gray white. The meaningful comparison of the pattern (particualrly the vibrational band L) of infrared spectrometry with the compositions of the almandine points out that the band becomes heightened with the decrease in the molecules of the minerat, that is, the two are negatively related.Based on the above studies, a conclusion is easily drawn that the Mn-rich garnets can be attributed to the autometasomatism of the hydro - thermal fluids derived from submarine exhalations. Researches on the garnet minerals is not only significant to mineralogy and metallogenesis but also to ore-prospecting.
出处
《地质找矿论丛》
CAS
CSCD
1990年第3期71-80,共10页
Contributions to Geology and Mineral Resources Research
