Shaanxi Xiaobaodang Mining Co., Ltd.
College of Geology and Environment, Xi’an University of Science and Technology

为恢复小保当煤矿新近系保德组沉积古环境,采用地球化学方法对小保当煤矿新近系保德组红土层古气候、古盐度、古氧化还原、古水深等进行沉积古环境研究。结果表明:小保当煤矿保德组修正后的CIAcorr指数、Al2O3/MgO值、MgO/CaO值、CaO/(MgO·Al2O3)值及Sr/Cu值和Rb/Sr值指示温暖、湿润的中等风化条件,呈干旱-湿润、寒冷-温暖交替变化;Sr、Li、Ga、Rb/K2O反映保德组为淡水-微咸水沉积环境;Fe2+/Fe3+、Ni/Co、V/Cr、V/(V+Ni)、δU、δCe和Cu/Zn反映保德组为氧化环境,局部指示贫氧环境;Co含量反映保德组古水深呈深浅交替变化。研究为小保当煤矿保德组恢复了沉积古环境,也为其他层位、其他地区古环境恢复提供依据。

In order to restore the sedimentary paleoenvironment of Neogene Baode Formation in Xi- aobaodang Coal Mine, the paleoclimate, paleosalinity, paleoredox and water depth of the red soil layer of Neogene Baode Formation in Xiaobaodang Coal Mine were studied by geochemical methods. The re- sults show that the modified CIAcorr index, Al2 O3 / MgO, MgO/ CaO, CaO/ ( MgO· Al2 O3 ) , Sr/ Cu and Rb / Sr value of Baode Formation in Xiabaodang Coal Mine indicate the moderate weathering conditions of warm and wet, with alternating changes of drought-wet and cold-warm. Sr, Li, Ga, Rb / K2O indicate that the sedimentary environment of Baode Formation is fresh-brackish water. Fe2 + / Fe3 + , Ni/ Co, V/ Cr, V/ ( V + Ni) , δU, δCe and Cu / Zn indicate that Baode formation is oxidizing environment and local oxygen-poor environment. The content of Co indicates that the paleo-water depth of Baode Formation is alternately deep and shallow. The study can restore the sedimentary paleoenvironment of Baode Forma- tion in Xiabaodang Coal Mine, and provide the basis for the paleoenvironment restoration of other strata and other areas.

国家自然科学基金项目(41641018);西安科技大学博士研究启动项目(2020DQJ02)第一作者:白坤,男,陕西西安人,工程师,E-mail:3067421248@qq.com

白坤,马越,贾栋栋,等.小保当煤矿新近系保德组沉积古环境恢复[J].西安科技大学学报,2024,44(2):328-335.

BAI Kun, MA Yue, JIA Dongdong, et al. Restoration of sedimentary paleoenvironment of Neogene Baode Formation in XiabaodangCoal Mine[ J] . Journal of Xi’an University of Science and Technology, 2024, 44( 2) : 328-335.