广东海南岛石碌铁矿石英的研究及其意义

本文在显微镜研究基础上,综合运用扫描电镜、光谱分析、X射线分析、差热分析和红外光谱等手段,对铁矿中石英进行矿物标型特征的研究。论证了这种石英的绝大多数有蛋白石→玉髓→石英的形成过程。同时,成矿时也很可能有一些火山成因石英斑晶或晶屑掺杂其中,而陆源碎屑石英少见。还发现了铁矿中玉髓的似生物结构。因而为石碌铁矿海相火山(胶体)沉积变质成因说提供了新的科学依据。

THE RESEARCH OF QUARTZ IN SHILU IRON DEPOSITS OF HAINAN ISLAND AND ITS SIGNIFICANCE

The typomorphic peculiarities of minerals of quartz grains in ore specimen have been studied in detail by means of microscope followed by scanning electron microscope, spectral analysis, X-Ray analysis, thermal analysis and infrared spectra. It is argued that most of the quartz grains in the ore may have changed from opal to chalcedony and finally to quartz. A certain amount of pyroclastic quartz or quartz phenocrysts might be mixed in during the formation of the deposit, but quartz detritus transported from continents were few. Some fossil-like structures were also found in the chalcedony. All the above facts provide new evidence for the metamorphic marine volcano sedimentary origin of Shilu iron deposit.