摘要
沉积物元素地球化学特征是盆地沉积环境变化的响应。本文根据元素Ti、Mn、Li、Cr、Co、Ni、Cu、Zn、Ga、Cd、Ba、Pb、Sr、Rb、V的含量及Sr/Ba、Ni/Co、Ni/V、Cu/Zn、V/(V+Ni)比值的变化规律,并结合有机地球化学特征,对抚顺盆地始新统计军屯组油页岩的沉积环境进行了分析。以Li、Ti为代表的外源元素,贫矿段的含量高于富矿段;而Sr、Ba等湖盆内化学沉积元素,富矿段的含量高于贫矿。Sr/Ba、V/(V+Ni)、Ni/Co、Cu/Zn比值从贫矿段到富矿段呈现逐渐增大的趋势。富矿段有机质类型主要为I型,而贫矿段主要为II1、II2。分析表明,本区油页岩富矿段形成于水体盐度较贫矿段高、还原性强的深湖环境,而贫矿段则形成于还原性较弱的半深湖-浅湖环境。
Elemental geochemistry characteristics of sediment are responses to the depositional environment. Based on the contentsof the elementsincludingTi, Mn, Li, Cr, Co, Ni, Cu, Zn, Ga, Cd, Ba, Pb, Sr, Rb, V and elemental ratios such as Sr/Ba, Ni/Co, Ni/V, Cu/Zn, V/ （V＋ Ni） as well as organic geochemistry, the authors analyzed the depositional environment of the oil shale. Exogenic elements enriched in lowgrade section, such as Li and Ti; while endogenic elements, represented by Sr and Ba in low concentrations. Elemental ratios including Sr/Ba, V/ （V ＋ Ni）, Ni/Co, Cu/Zn gradually increased from low-grade section to high-grade section. Organic matter types are mainly Ⅰ type in high-grade section, while Ⅱ1 and Ⅱ2 types in low-grade section. These indices suggest that high-grade oil shale generates from deep lake with heavyish salinity and powerful reducibility and low-grade oil shale generates from semi-deep lake-mere with weak reducibility.
出处
《世界地质》
CAS
CSCD
2007年第4期441-446,共6页
World Geology
基金
国家自然科学基金(40672075)
高等学校博士学科点专项科研项目(20050183051)联合资助
关键词
抚顺盆地
始新统
油页岩
地球化学
沉积环境
Fushun Basin
Eocene
oil shale
geochemistry
depositional environment
