Position: Home > Articles > Origin and Characteristics of Middle Permian Eyeball-shaped Limestone in Xiakou Area of Xingshan County of Hubei Province
Journal of Yangtze University(Natural Science Edition)Agricultural Science Volumn
2016,13
(14)
1-8+10
湖北兴山峡口中二叠统眼球状石灰岩特征及成因
作 者：
何明薇;罗进雄
单 位：
中国石油大学(北京)地球科学学院;长江大学地球科学学院
关键词：
兴山峡口;中二叠统;眼球状石灰岩;缺氧环境;上升流
摘 要：
眼球状石灰岩是一种特殊类型的石灰岩,由"眼球"和"眼皮"两部分组成,广泛分布于中上扬子地区中二叠统栖霞组下部和茅口组中-下部。以湖北兴山峡口地区中二叠统眼球状石灰岩为例,通过野外系统观察和详细描述,结合镜下岩石薄片鉴定、稳定碳氧同位素及微量元素等资料分析,对眼球状石灰岩的特征进行了系统描述,对其形成机理进行了探讨。综合分析表明,眼球状石灰岩中的"眼球"为富氧沉积,"眼皮"为缺氧沉积,"眼皮"可能为上升流作用的产物;眼球状石灰岩可能是受上升流作用的影响,在沉积和差异压实共同作用下形成的。此外,眼球状石灰岩中"眼皮"部分的有机碳含量较高,且分布广,应为良好的烃源岩。
译 名：
Origin and Characteristics of Middle Permian Eyeball-shaped Limestone in Xiakou Area of Xingshan County of Hubei Province
作 者：
He Mingwei;Luo Jinxiong;College of Geosciences,China University of Petroleum;
关键词：
Daxiakou of Xingshan County;;middle Permian;;eyeball-shaped limestone;;anoxic environment;;upwelling
摘 要：
The eyeball-shaped limestone was a kind of carbonate with special structure,which was composed of eyeball and eyelid,and was widely distributed in the lower part of the Middle Permian Qixia Formation and the middle and lower parts of the Middle Permian Maokou Formation in the middle-upper Yangtze Region.Based on field observation and description,combined with the analysis of thin section of rocks,carbon and oxygen isotope data and trace element data,the features of eyeballshaped limestone in Xiakou Area of Xingshan County of Hubei Province were described systematically,its formation mechanism was studied.The comprehensive analysis indicated that the eyeball was the product of oxygen enriched deposition and eyelid was the product of anoxic deposition,the eyelid might be the product of upwelling.The eyeball-shaped limestones was formed by the interaction of sedimentation and differential compaction under the influence of upwelling.The organic carbon content of the eyelid part of the eyeball-shaped limestone is high,and its distribution is wide,which should be agood source rock.
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