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《Contributions To Geology and Mineral Resources Research》 1990-03
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TYPOMORPHIC PECULIARITIES OF THE GARNET FROM DONGSHENCMIAO POLYMETALLIC SUPHIDE DEPOSIT IN THE NORTHERN MARGIN OF NORTH CHINA PLATFORM:THIER SICNIFCANCE TO ORE PROSPECTING

Xia Xuehui Geological Institute, Ministry of Chemical Industry  
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.
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