抚顺盆地始新统计军屯组微量元素特征及油页岩的有利成矿条件

通过剖面上样品的无机地球化学元素分析,对始新统计军屯组微量元素特征进行了研究,并据此探讨了计军屯组油页岩的有利成矿条件。计军屯组贫矿段和富矿段Sr/Cu、Rb/Sr、Sr/Ba、B/Ga的平均值分别为2.30、0.63、0.20、1.07和3.41、0.43、0.34、1.50,结合元素Rb、Sr、Cu、Ba、Ga、B的质量分数,揭示了计军屯组形成于温暖湿润气候和淡水沉积环境;西露天组Sr/Cu、Rb/Sr、Sr/Ba、B/Ga的平均值分别为24.63、0.14、1.25、3.90,结合元素Rb、Sr、Cu、Ba、Ga、B的质量分数,揭示了西露天组形成于干旱炎热气候和半咸水—咸水环境。古气候和古盐度的元素地球化学参数Sr/Cu、Rb/Sr和Sr/Ba的相关关系以及西露天组碳酸盐岩碳、氧同位素的相关关系,指示了研究区计军屯组富矿段和西露天组沉积时古气候是湖泊古盐度的主要控制因素,并且古湖泊较为封闭。研究区计军屯组高品质油页岩形成于温暖湿润气候和淡水沉积环境。温暖湿润气候和封闭型古湖泊可能是形成研究区高品位油页岩的有利条件。

Trace Element Characteristics of Eocene Jijuntun Formation and the Favorable Metallogenic Conditions of Oil Shale in Fushun Basin

Based on the field geological profile and inorganic geochemical elemental analysis of samples,trace element characteristics of Eocene Jijuntun Formation have been studied and favorable oil shale metallogenic conditions have been discussed.The average values Sr/Cu,Rb/Sr,Sr/Ba,B/Ga in poor ore and rich ore segments of Jijuntun Formation are 2.30,0.63,0.20,1.07 and 3.41,0.43,0.34,1.50 separately.The contents of Rb,Sr,Cu,Ba,Ga,B and those ratios indicate that in study aera Jijuntun Formation formed in warm,humid climatic conditions and fresh water environment.The average values of Sr/Cu,Rb/Sr,Sr/Ba and B/G are 24.63,0.14,1.25 and 3.90 respectively,and these ratios and the contents of Rb,Sr,Cu,Ba,Ga,B indicate Xiloutian Formation formed in dry,hot climatic conditions and simisaline-saline water environment.Correlation between Sr/Cu,Rb/Sr and Sr/Ba and carbon and oxygen isotope in carbonate rock of Xilutian Formation indicate that the paleoclimate is the main factor which controls the palaeosalinity and paleo-lake is closed type during the upper segment of Jijuntun Formation and Xiloutian Formation.The oil shale formed in warm,humid climatic conditions and fresh water depositional environment.Warm,humid climatic conditions and closed type paleo-lake are beneficial for the forming of high grade oil shale.