内蒙古因格井坳陷湖相白云质泥岩地球化学特征及地质意义
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摘要
本文对内蒙古巴音戈壁盆地因格井坳陷下白垩统音戈壁组上段湖相白云质泥岩进行了地球化学分析,据此探讨了其对构造背景、源岩属性及古沉积环境重建的意义。研究表明:白云质泥岩具有富Ca,Na,Sr,U,V元素,贫K,P,Ba,Rb,Sc,Th,Zr元素的特点;稀土元素总量变化范围大(59.29×10~(-6)～283.80×10~(-6)),轻、重稀土分异明显,δEu为中等偏强的负异常(平均值0.62),δCe无异常(平均值1.01)。构造判别图解及δEu异常特征共同指示白云质泥岩源岩具有大陆岛弧和主动大陆边缘构造背景。稀土配分模式及源岩属性判别图解指示白云质泥岩源岩以上地壳长英质岩石为主。垂向上巴音戈壁组上段整体为干旱、厌氧、偏强还原的咸湖环境。古气候、古盐度及氧化还原指标在巴音戈壁组上段中部和下部界面变化明显。在下部(K1b2-1)干热环境下出现过相对湿冷的沉积过程,古盐度、氧化还原环境也均与干热—冷湿演化具有耦合性,即在厌氧的、偏强还原的咸湖沉积环境下存在短暂的氧化环境。
Based on the geochemical analysis of lacustrine dolomitic mudstones in the upper Bayingebi Formation of the Lower Cretaceous in Yingejing Depression, Bayingebi Basin, Inner Mongolia, its geological significance, source rock properties, and paleo-depositional environment have been investigated. The results show that dolomitic mudstones are characterized by the enrichment in Ca, Na, Sr, U, V and depletion in K, P, Ba, Rb, Sc, Th, Zr. The total REEs contents vary significantly(59.29×10~(-6)～283.80×10~(-6)) with differentiation of LREE and HREE, which reveals a moderately strong negative Eu anomaly(average value 0.616) and Ce normality(average value of 1.01). Tectonic discrimination diagrams and features of Eu jointly indicate that source rocks of dolomitic mudstones were in a continental island arc and active continental margin setting. The pattern of REE distribution and diagrammatic diagramming of source rocks suggests that dolomitic mudstones are mainly composed of felsic rocks from upper crustal feldspar rocks. Vertically,upper Bayingebi Formation was deposited in a salty lacustrine environment with drought, anaerobic and strong partial reduction. And paleoclimate, paleosalinity and redox index changed obviously in the middle and lower parts of upper Bayingebi Formation. Meanwhile,a relatively wet-cold depositional process had appeared during the warm, dry environment of K1 b2-1. The paleosalinity and redox environment were also coupled with the evolution of warm-dry and cold-wet environment, that is, a brief oxic environment existed in the anaerobic and strongly reduced, salty lacustrine environment.
Based on the geochemical analysis of lacustrine dolomitic mudstones in the upper Bayingebi Formation of the Lower Cretaceous in Yingejing Depression, Bayingebi Basin, Inner Mongolia, its geological significance, source rock properties, and paleo-depositional environment have been investigated. The results show that dolomitic mudstones are characterized by the enrichment in Ca, Na, Sr, U, V and depletion in K, P, Ba, Rb, Sc, Th, Zr. The total REEs contents vary significantly(59.29×10~(-6)～283.80×10~(-6)) with differentiation of LREE and HREE, which reveals a moderately strong negative Eu anomaly(average value 0.616) and Ce normality(average value of 1.01). Tectonic discrimination diagrams and features of Eu jointly indicate that source rocks of dolomitic mudstones were in a continental island arc and active continental margin setting. The pattern of REE distribution and diagrammatic diagramming of source rocks suggests that dolomitic mudstones are mainly composed of felsic rocks from upper crustal feldspar rocks. Vertically,upper Bayingebi Formation was deposited in a salty lacustrine environment with drought, anaerobic and strong partial reduction. And paleoclimate, paleosalinity and redox index changed obviously in the middle and lower parts of upper Bayingebi Formation. Meanwhile,a relatively wet-cold depositional process had appeared during the warm, dry environment of K1 b2-1. The paleosalinity and redox environment were also coupled with the evolution of warm-dry and cold-wet environment, that is, a brief oxic environment existed in the anaerobic and strongly reduced, salty lacustrine environment.
引文
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王凤岗,侯树仁,张良,等.2018.巴音戈壁盆地南部塔木素铀矿床水岩作用特征及其与铀成矿关系研究[J].地质论评,64(3):633-646.
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吴赛赛,赵省民,邓坚.2016.漠河盆地中侏罗统漠河组泥岩元素地球化学特征及其地质意义:以MK-3井为例[J].地质科技情报,(3):17-27.
文华国,郑荣才,唐飞,等.2008.鄂尔多斯盆地耿湾地区长6段古盐度恢复与古环境分析[J].矿物岩石,28(1):114-120.
许中杰,程日辉,王嘹亮,等.2013.闽西南地区晚三叠-中侏罗世沉积岩矿物和元素地球化学特征:对盆地构造背景转变的约束[J].岩石学报,29(8):2913-2924.
徐崇凯,刘池洋,郭佩,等.2018.潜江凹陷古近系潜江组盐间泥岩地球化学特征及地质意义[J].沉积学报,36(3):617-629.
叶荷,张克信,季军良,等.2010.青海循化盆地23.1~5.0 Ma沉积地层中常量、微量元素组成特征及其古气候演变[J].地球科学,35(5):811-820.
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张成勇,聂逢君,侯树仁,等.2015.内蒙古巴音戈壁盆地塔木素地区砂岩型铀矿控制因素与成矿模式[J].地质科技情报,34(1):140-147.
张春良,沈玉林,秦勇,等.2016.崖南凹陷Y1井崖城组泥岩微量元素特征及地质意义[J].高校地质学报,22(3):512-518.
张耀东.2016.高放废物处置库-塔木素预选区巴音戈壁组上段粘土岩物质组成研究[D].南昌:东华理工大学.
张天福,孙立新,张云,等.2016.鄂尔多斯盆地北缘侏罗纪延安组、直罗组泥岩微量、稀土元素地球化学特征及其古沉积环境意义[J].地质学报,90(12):3454-3472.
张建军,牟传龙,周恳恳,等.2017.滇西户撒盆地芒棒组第三段泥岩地球化学特征:物源及其风化作用[J].矿物岩石地球化学通报,36(4):574-581.
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Bhatia M R.1985.Rare earth element geochemistry of Australian Paleozoic graywackes and mudrocks:Provenance and tectonic control[J].Sedimentary Geology,45(1):97-113.
Bhatia M R and Crook K A W.1986.Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J].Contributions to Mineralogy Petrology,92(2):181-193.
Cullers R L.1995.The controls on the major-and trace-element evolution of shales,siltstones and sandstones of Ordovician to tertiary age in the Wet Mountains region,Colorado,U.S.A.[J].Chemical Geology,123(1):107-131.
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