广东海南岛石碌铁矿石英的研究及其意义

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

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 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.