安徽巢北地区栖霞组臭灰岩段黄铁矿研究--形态及分布特征
首发时间:2017-05-22
摘要:在安徽巢湖北部山区栖霞组臭灰岩段(沥青质灰岩)底部灰岩中发现大量草莓状和自形状黄铁矿。草莓状黄铁矿主要发育在有孔虫?生物碎屑和缝合线中,对黄铁矿草莓体的粒径进行统计分析,发现草莓体粒径变化范围比较大(4~19μm),平均粒径为5.5~7.5μm,表明草莓状黄铁矿所处的微环境为下贫氧水体/沉积环境。自形状黄铁矿主要以半自形晶和它形晶为主发育在岩石(化石围岩)和化石(珊瑚)中,黄铁矿自形程度受到空间的影响。此外,见少量微晶黄铁矿与草莓状黄铁矿伴生,初步推断黄铁矿演化顺序为"微晶-莓状-自形状"。
关键词: 草莓状黄铁矿;自形状黄铁矿;微晶黄铁矿;化石;生长空间;演化
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The features and distribution characteristics of the pyrite,found in smelly limestone in Qixia formation in north Chao Hu, Anhui province
Abstract:Plenty of pyrite were found in the bottom of smelly limestone in Qixia formation in north Chaohu, Anhui province, and are two forms of pyrite including pyrite framboid and euhedral pyrite. We counted the pyrite framboid developed in foraminifera?bioclast and stylolite form the smelly limestone and found a large range (2~19μm) of the size, and the average is about 5.5~7.5μm, indicating the microenmronments of pyrite formed is Under Oxygen-depleted water. Euhedral pyrite is mainly developed in rocks (fossil rocks) and fossils (corals) with subhedral and anhedral. The degree of crystal morphology development is influenced by growth space. Besides, microcrystalline pyrite was found with pyrite framboids. Indicating the evolution is "microcrystals -framboid-euhedral".
Keywords: pyrite framboid euhedral pyrite microcrystalline pyrite fossil growth space evolution
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安徽巢北地区栖霞组臭灰岩段黄铁矿研究--形态及分布特征
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