Microscopic Observation of the Pyrite Whisker Patterns in Gengzhuang , Shanxi
详细信息
- 责任者：Huang Fei (College of Resources and Civil Engineering ; Northeastern University ; Shenyang 110004 ; China) ; Kou Daming
- 刊名：Acta Geologica Sinica
- 出版年：2011
- 卷期：85(9)
- 关键词：黄铁矿 ; pyrite ; 标型矿物 ; typomorphic minerals ; 山西 ; Shanxi Province
- 页码：p.1486-1492
- 图表：4 illus., 1 table, 19 refs.
- 分类号：0700
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
///Growth of pyrite whiskers is a special type of crystallization.Three-dimensional microscopic observation was conducted on pyrite whishkers occurring on the different parts of barite crystals from Gengzhuang by using laser microscope.The data indicate that whiskers on different parts of barite crystals vary greatly in size,with lengths ranging usually from 150 μm to 1700 μm and diameter from 3.504 μm to 113.720 μm and the degree of surface undulation changing from 0.349 μm to 35.128 μm.Whisker growth presents a law that whisker’s length grows gradually from a zone to d zone,while both diameter and degree of surface undulation decreases gradually.Based on occurrence of crystal whiskers and study of fluid inclusions in barite and EPMA data component data,this study comprehensively analyzed the interrelation between crystal whiskers and hydrothermal state or/and evolution process.It is concluded that huge crystal whiskers with relatively low ratio of length and diameter,surface strumae and high impurity content are typomorphic features for comparatively high temperature and high concentration conditions and represent an unstable growth environment;Whikers with varied diameters and complicated appearance are typomorphic features for a wide range of temperatures,relatively high concentration of components and metastable state;and whiskers with small diameters,equality and simple shape represent typomorphic features for a stable temperature,relatively low concentration of components,and stable state.Increasing diameter of crystal whiskers indicates existence of pulsating and repeated process during process of hydrothermal solution evolution.The microscopic characteristic of crystal whiskers is indicative of hydrothermal activity and provides evidence of mineral morphology for studying features and evolution process of hydrothermal fluids.
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