鄂尔多斯盆地延长组长7段沉积岩元素地球化学特征及沉积环境分析
Geoscience（2019）
Abstract
沉积岩的地球化学特征可以反映盆地沉积环境.为了探讨鄂尔多斯盆地延长组沉积时期古气候、氧化还原条件、古盐度等特征,对鄂尔多斯盆地东南部铜川延长组长7段的5个砂岩、8个页岩样品进行主量、微量以及稀土元素地球化学分析.结果 显示,长7段细粒沉积物Al2O3/SiO2值与K2O/Na2O值指示样品成分成熟度差别不大,黏土矿物含量较高.ΣREE平均值为132.65×10-6,明显低于北美页岩平均稀土元素含量,也低于全球平均大陆上地壳值;LREE分异程度较高,呈微弱的Eu正异常,无Ce异常.“C值”、Sr/Cu、Rb/Sr、Mg/Ca等指标显示延长组沉积期整体处于温暖潮湿的气候区.研究区样品富集微量元素U、Sc、Cs(平均20.11 ×10-6、9.66×10-6、6.08×10-6),结合V、δU、Th/U、V/Cr、V/Sc、V/(V+ Ni)等指标分析,结果指示延长组沉积期以底层水体呈强分层的还原环境为主.Li、Sr、Ni、Sr/Ba、(MgO/Al2O3)×100等值显示沉积期水体总体为淡水-微咸水.
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