摘要
胶莱盆地莱阳群瓦屋夼组和水南组多以页岩和砂岩为主,见部分灰岩。采用波长色散X荧光光谱仪、等离子质谱仪等对研究区岩石样品进行元素地球化学测试,根据样品的主量、微量、稀土元素含量及相关元素比值,探讨瓦屋夼组、水南组的古沉积环境。得到以下结论:瓦屋夼组、水南组SiO_2、MgO、CaO含量较高,水南组部分样品Al_2O_3含量超过10%,且两套地层都表现出较明显的轻稀土元素富集特征;利用Sr/Ba、Rb/K、V/Ni、Th/U、Fe2+/Fe3+、U/Th、Eu/Eu*、Ce/Ce*、Sr/Cu等一系列环境判别指标,结合近期研究成果和野外地质特征认为,瓦屋夼组具明显的海相沉积特征,形成于干热和氧化环境,水南组也具有海相沉积特征,形成于干热和还原环境。
The strata of Wawukuang and Shuinan Formations in Laiyang Group,Jiaolai Basin are mainly composed of shale and sandstone with some limestone.This paper conducted the element geochemistry test of the rock samples in the study area by using WD-XRF,ICP-MS and other instrument and discussed the palaeoenvironment of Wawukuang and Shuinan Formations based on the content of major,trace and rare earth element and the ratio of related elements in the samples.After research,it came to the following conclusions:The contents of SiO2,MgO and CaO are relatively higher in Wawukuang and Shuinan Formations,and the content of Al2 O3 in some samples of Shuinan Formation amounts to more than 10%.Both the sets of strata show the obvious enrichment of light rare earth elements.By using a series of environmental criteria such as Sr/Ba,Rb/K,V/Ni,Th/U,U/Th,Eu/Eu*,Ce/Ce*,and Sr/Cu,and by combining with previous studies and field section characteristics,it is found that the strata of both Wawukuang and Shuinan Formations show obvious marine sedimentary characteristics formed in dry,hot and oxidized environments.
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2018年第1期20-34,共15页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(41428201)
关键词
瓦屋夼组
水南组
元素地球化学
沉积琢境
分析指标
剖面特征
Wawukuang formation
Shuinan formation
element geochemistry
depositional environment
analysis of indicators
the section characteristics
