摘要
利用多元统计分析方法对广西来宾铁桥剖面栖霞组层纹灰岩和江西慈化洪桥剖面栖霞组粒泥灰岩的岩石地球化学特征进行了分析;对广西来宾铁桥剖面栖霞组的灰岩样品40件及该剖面中产出的菊花石样品8件、江西慈化洪桥剖面的粒泥灰岩样品8件、浏阳永和剖面的灰岩样品10件及该区产出的菊花石样品3件进行了黄铁矿矿化程度(DOP值)的测定分析,分析结果表明华南地区的DOP值多数大于0.42;结合岩石微量元素比值特征的分析,表明华南地区栖霞组灰岩形成于缺氧的沉积环境。DOP值的变化趋势为:浏阳>来宾>慈化,表明华南地区3个剖面的沉积环境含氧量的关系为:浏阳<来宾<慈化。DOP值在3个剖面上的周期性变化与剖面中的沉积旋回相对应,亦表明沉积环境的含氧量呈周期性变化。
The geochemical features of sediments and/or rocks may be employed as important indicators for the sedimentary environment. DOP data analysis is made of about 69 samples collected from Laibing carbonates and its chrysanthemum stones, Cihua carbonates, Liuyang carbonates and its chrysanthemum stones, showing DOP data more than 0.42. This integrated with the ratio of microelements,suggests that Qixia Formation could have been deposited in dysaerobic sedimentary environments. While the value of DOP in the three sections indicates the amounts of oxygen in the environments,respectively of Cihua, Laibing, and Liuyang. The periodicity of the DOP value in the three sections,connected with the gyration of stratum, suggests the change of oxygen amount in the sedimentation periods.
出处
《地质科技情报》
CAS
CSCD
北大核心
2004年第1期33-37,41,共6页
Geological Science and Technology Information
基金
国家自然科学基金资助项目(49002030)
关键词
沉积学
地球化学
栖霞组
黄铁矿
矿化度
Qixia Formation
geochemistry
DOP
dysaerobic sedimentary
