鄂尔多斯盆地西缘宁东地区侏罗系含铀地层元素地球化学特征
|
摘要
沉积岩的地球化学特征记录了岩石沉积时的重要地质信息,是研究沉积古环境、源区构造背景及源岩属性的有效手段。采用X衍射荧光光谱(XRF)和等离子体质谱仪(ICP-MS)对鄂尔多斯盆地西缘宁东地区中侏罗统直罗组下段地层砂岩和泥岩样品的主、微量元素及稀土元素含量进行测试分析,旨在对其沉积古环境进行恢复,并对其源区构造背景、源岩属性等特征进行综合研究。研究表明:Sr含量、Sr/Cu值、V/(V+Ni)值、U/Th值、化学蚀变指数(CIA)等地球化学指标综合指示出研究区直罗组下段地层沉积古气候为半干旱–半湿润气候,古水体环境为富氧的淡水环境。根据稀土元素(REE)特征分析,推测研究区直罗组下段地层物源主要来自盆地西北部的阿拉善古陆,源岩岩性主要为片麻岩、石榴石浅粒岩、变不等粒石英砂岩和变中细粒石英砂岩。源区构造背景主要为大陆岛弧,与大洋岛弧也有一定关联。
The geochemical characteristics of sedimentary rocks record important geological information during the process of rock deposition, are an effective tool for the study of the paleoenvironment, the tectonic setting and the attributes of provenance. This paper aims to the comprehensive study of the paleoenvironment, the tectonic setting and provenance attribute of lower section of Zhiluo Formation by testing and analyzing the content of major elements, trace elements, and rare earth elements of the sandstone and mudstone samples collected from the lower section of Middle Jurassic Zhiluo Formation in the eastern margin of Ordos basin using the method of XRF and ICP-MS. The research indicates that Sr content, Sr/Cu ratio, V/(V+Ni) ratio, U/Th ratio, and CIA as well as other geochemical indexes suggest the semi-arid and semi-humid paleoclimate of lower section of Zhiluo Formation, and the oxygen enrichment-secondary oxygen enrichment freshwater environments as the paleo-water conditions; The rare earth feature proves that the provenances of lower section of Zhiluo Formation may be mainly the Alashan ancient land in the northwest of the basin. The provenance lithology is mainly made up of gneiss, garnet shallow rock, unequal grain quartz sandstone and medium-grained quartz sandstone. The tectonic setting of provenance area is mainly related to the continental island arc, and the oceanic island arc.
The geochemical characteristics of sedimentary rocks record important geological information during the process of rock deposition, are an effective tool for the study of the paleoenvironment, the tectonic setting and the attributes of provenance. This paper aims to the comprehensive study of the paleoenvironment, the tectonic setting and provenance attribute of lower section of Zhiluo Formation by testing and analyzing the content of major elements, trace elements, and rare earth elements of the sandstone and mudstone samples collected from the lower section of Middle Jurassic Zhiluo Formation in the eastern margin of Ordos basin using the method of XRF and ICP-MS. The research indicates that Sr content, Sr/Cu ratio, V/(V+Ni) ratio, U/Th ratio, and CIA as well as other geochemical indexes suggest the semi-arid and semi-humid paleoclimate of lower section of Zhiluo Formation, and the oxygen enrichment-secondary oxygen enrichment freshwater environments as the paleo-water conditions; The rare earth feature proves that the provenances of lower section of Zhiluo Formation may be mainly the Alashan ancient land in the northwest of the basin. The provenance lithology is mainly made up of gneiss, garnet shallow rock, unequal grain quartz sandstone and medium-grained quartz sandstone. The tectonic setting of provenance area is mainly related to the continental island arc, and the oceanic island arc.
引文
[1]王佟,王庆伟,傅雪海.煤系非常规天然气的系统研究及其意义[J].煤田地质与勘探,2014,42(1):24-27.WANG Tong,WANG Qingwei,FU Xuehai.The significance and the systematic research of the unconventional gas in coal measures[J].Coal Geology&Exploration,2014,42(1):24-27.
[2]雷开宇,刘池洋,张龙,等.鄂尔多斯盆地北部侏罗系泥岩地球化学特征:物源与古沉积环境恢复[J].沉积学报,2017,35(3):621-636.LEI Kaiyu,LIU Chiyang,ZHANG Long,et al.Element Geochemical characteristics of the Jurassic mudstones in the Northern Ordos basin:Implications for tracing sediment sources and paleoenvironment restoration[J].Acta Sedimentologica Sinica,2017,35(3):621-636.
[3]王水利,梁绍暹.华北北部山西组煤系黏土岩稀土元素地球化学特征[J].煤田地质与勘探,2010,38(6):12-16.WANG Shuili,LIANG Shaoxian.REE geochemistry of clay in coal measures of Shanxi Formation in the north of North China[J].Coal Geology&Exploration,2010,38(6):12-16.
[4]张天福,孙立新,张云,等.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,2016,90(12):3454-3472.ZHANG Tianfu,SUN Lixin,ZHANG Yun,et al.Geochemical characteristics of the Jurassic Yan’an and Zhiluo Formations in the northern margin of Ordos basin and their paleoenvironmental implications[J].Acta Geologica Sinica,2016,90(12):3454-3472.
[5]秦国红,邓丽君,刘亢,等.鄂尔多斯盆地西缘煤中稀土元素特征[J].煤田地质与勘探,2016,44(6):8-14.QIN Guohong,DENG Lijun,LIU Kang,et al.Characteristic of rare earth elements in coal in western margin of Ordos basin[J].Coal Geology&Exploration,2016,44(6):8-14.
[6]陈岳龙,李大鹏,王忠,等.鄂尔多斯盆地周缘地壳形成与演化历史:来自锆石U-Pb年龄与Hf同位素组成的证据[J].地学前缘,2012,19(3):147-166.CHEN Yuelong,LI Dapeng,WANG Zhong,et al.History of formation and evolution on the crust around the Ordos basin:Evidences from U-Pb dating and Hf isotopic composition of zirons[J].Earth Science Frontiers,2012,19(3):147-167.
[7]刘池洋,赵红格,王锋,等.鄂尔多斯盆地西缘(部)中生代构造属性[J].地质学报,2005,79(6):737-745.LIU Chiyang,ZHAO Hongge,WANG Feng,et al.Attributes of the Mesozoic structure on the west margin of the Ordos basin[J].Acta Geologica Sinica,2005,79(6):737-745.
[8]NESBITT H W,YOUNG G M.Early proterozoic climates and plate motions inferred from major element chemistry of lutites[J].Nature,1982,299:715-717.
[9]FEDO C M,NESBITT H W,YOUNG G M.Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols,with implications for paleoweathering conditions and provenance[J].Geology,1995,23(10):921-924.
[10]冯连君,储雪蕾,张启锐,等.化学蚀变指数(CIA)及其在新元古代碎屑岩中的应用[J].地学前缘,2003,10(4):539-544.FENG Lianjun,CHU Xuelei,ZHAGN Qirui,et al.CIA(Chemical Index of Alteration)and its applications in the Neopratreozoic clastic rocks[J].Earth Science Frontiers,2003,10(4):539-544.
[11]TRIBOVILLARD N,ALGEO T J,LYONS T,et al.2006.Tracementals as paleoredox and paleoproductivity proxies:An update[J].Chemical Geology,2006,232(1/2):12-32.
[12]陈骏,汪永进,陈旸,等.中国黄土地层Rb和Sr地球化学特征及其古季风气候意义[J].地质学报,2001,75(2):259-266.CHEN Jun,WANG Yongjin,CHEN Yang,et al.Rb and Sr geochemical characterization of the Chinese loess and its implications for palaeomonsoon climate[J].Acta Geologica Sinica,2001,75(2):259-266.
[13]叶荷,张克信,季军良,等.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(中国地质大学学报),2010,35(5):811-820.YE He,ZHANG Kexin,JI Junliang,et al.Major and trace element characters of the sediments and paleoclimatic evolvement during about 23.1-5.0 Ma in Xunhua basin,Qinghai[J].Earth Science(Journal of China University of Geosciences),2010,35(5):811-820.
[14]RUSSELL A D,MORFORD J L.The behavior of redox-sensitive metals across a laminated-massive-laminated transition in Saanich Inlet,British Columbia[J].Marine Geology,2001,174:341-354.
[15]FRANCOIS R.The study on the regulation of the concern trations of some tracementals(Rb,Sr,Zn,Cu,V,Cr,Ni,Mn,and Mo)in Saanich inlet sediments,British Columbia,Canada[J].Marine Geology,1988,83:258-308.
[16]JONES B,MANNING D A C.Comparion of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstone[J].Chemical Geology,1994,111(1/2/3/4):111-129.
[17]郑荣才,柳梅青.鄂尔多斯盆地长6油层组古盐度研究[J].石油与天然气地质,1999,20(1):20-25.ZHENG Rongcai,LIU Meiqing.Study on palaeosalinity of Chang-6 oil reservoir set in Ordos basin[J].Oil&Gas Geology,1999,20(1):20-25.
[18]刘刚,周东升.微量元素分析在判别沉积环境中的应用:以江汉盆地潜江组为例[J].石油实验地质,2007,29(3):307-310.LIU Gang,ZHOU Dongsheng.Application of microelements analysis in identifying sedimentary environment:Taking Qianjiang Formation in the Jianghan basin as an example[J].Petroleum Geology&Experiment,2007,29(3):307-310.
[19]CULLERS R L.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,1995,123(1/2/3/4):107-131.
[20]BHATIA M R,CROOK K A W.Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J].Contributions to Mineralogy and Petrology,1986,92(2):181-193.
[21]王国茹.鄂尔多斯盆地北部上古生界物源及层序岩相古地理研究[D].成都:成都理工大学,2011.
[22]赵庆英,李刚,刘正宏,等.内蒙古大青山地区沙德盖岩体特征及成因[J].吉林大学学报(地球科学版),2009,39(6):1073-1079.ZHAO Qingying,LI Gang,LIU Zhenghong,et al.Characteristics and origin of the Shadegai pluton in the Daqingshan area,Inner Mongolia[J].Journal of Jilin University(Earth Science Edition),2009,39(6):1073-1079.
[23]刘平华,刘福来,蔡佳,等.华北克拉通孔兹岩带中段大青山-乌拉山变质杂岩立甲子基性麻粒岩年代学及地球化学研究[J].岩石学报,2013,29(2):462-484.LIU Pinghua,LIU Fulai,CAI Jia,et al.Geochronological and geochemical study of the Lijiazi mafic granulites from the Daqingshan-Wulashan metamorphic complex,the central Khondalite belt in the North China Craton[J].Acta Petrologica Sinica,2013,29(2):462-484.
[24]罗婷婷,周立发.鄂尔多斯盆地南缘下石盒子组碎屑岩地球化学特征[J].西北大学学报(自然科学版),2013,43(5):765-775.LUO Tingting,ZHOU Lifa.Geochemistry characteristic of theclastic rocks from Xiashihezi Formation in the south of Ordos basin[J].Journal of Northwest University(Natural Science Edition),2013,43(5):765-775.
[2]雷开宇,刘池洋,张龙,等.鄂尔多斯盆地北部侏罗系泥岩地球化学特征:物源与古沉积环境恢复[J].沉积学报,2017,35(3):621-636.LEI Kaiyu,LIU Chiyang,ZHANG Long,et al.Element Geochemical characteristics of the Jurassic mudstones in the Northern Ordos basin:Implications for tracing sediment sources and paleoenvironment restoration[J].Acta Sedimentologica Sinica,2017,35(3):621-636.
[3]王水利,梁绍暹.华北北部山西组煤系黏土岩稀土元素地球化学特征[J].煤田地质与勘探,2010,38(6):12-16.WANG Shuili,LIANG Shaoxian.REE geochemistry of clay in coal measures of Shanxi Formation in the north of North China[J].Coal Geology&Exploration,2010,38(6):12-16.
[4]张天福,孙立新,张云,等.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,2016,90(12):3454-3472.ZHANG Tianfu,SUN Lixin,ZHANG Yun,et al.Geochemical characteristics of the Jurassic Yan’an and Zhiluo Formations in the northern margin of Ordos basin and their paleoenvironmental implications[J].Acta Geologica Sinica,2016,90(12):3454-3472.
[5]秦国红,邓丽君,刘亢,等.鄂尔多斯盆地西缘煤中稀土元素特征[J].煤田地质与勘探,2016,44(6):8-14.QIN Guohong,DENG Lijun,LIU Kang,et al.Characteristic of rare earth elements in coal in western margin of Ordos basin[J].Coal Geology&Exploration,2016,44(6):8-14.
[6]陈岳龙,李大鹏,王忠,等.鄂尔多斯盆地周缘地壳形成与演化历史:来自锆石U-Pb年龄与Hf同位素组成的证据[J].地学前缘,2012,19(3):147-166.CHEN Yuelong,LI Dapeng,WANG Zhong,et al.History of formation and evolution on the crust around the Ordos basin:Evidences from U-Pb dating and Hf isotopic composition of zirons[J].Earth Science Frontiers,2012,19(3):147-167.
[7]刘池洋,赵红格,王锋,等.鄂尔多斯盆地西缘(部)中生代构造属性[J].地质学报,2005,79(6):737-745.LIU Chiyang,ZHAO Hongge,WANG Feng,et al.Attributes of the Mesozoic structure on the west margin of the Ordos basin[J].Acta Geologica Sinica,2005,79(6):737-745.
[8]NESBITT H W,YOUNG G M.Early proterozoic climates and plate motions inferred from major element chemistry of lutites[J].Nature,1982,299:715-717.
[9]FEDO C M,NESBITT H W,YOUNG G M.Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols,with implications for paleoweathering conditions and provenance[J].Geology,1995,23(10):921-924.
[10]冯连君,储雪蕾,张启锐,等.化学蚀变指数(CIA)及其在新元古代碎屑岩中的应用[J].地学前缘,2003,10(4):539-544.FENG Lianjun,CHU Xuelei,ZHAGN Qirui,et al.CIA(Chemical Index of Alteration)and its applications in the Neopratreozoic clastic rocks[J].Earth Science Frontiers,2003,10(4):539-544.
[11]TRIBOVILLARD N,ALGEO T J,LYONS T,et al.2006.Tracementals as paleoredox and paleoproductivity proxies:An update[J].Chemical Geology,2006,232(1/2):12-32.
[12]陈骏,汪永进,陈旸,等.中国黄土地层Rb和Sr地球化学特征及其古季风气候意义[J].地质学报,2001,75(2):259-266.CHEN Jun,WANG Yongjin,CHEN Yang,et al.Rb and Sr geochemical characterization of the Chinese loess and its implications for palaeomonsoon climate[J].Acta Geologica Sinica,2001,75(2):259-266.
[13]叶荷,张克信,季军良,等.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(中国地质大学学报),2010,35(5):811-820.YE He,ZHANG Kexin,JI Junliang,et al.Major and trace element characters of the sediments and paleoclimatic evolvement during about 23.1-5.0 Ma in Xunhua basin,Qinghai[J].Earth Science(Journal of China University of Geosciences),2010,35(5):811-820.
[14]RUSSELL A D,MORFORD J L.The behavior of redox-sensitive metals across a laminated-massive-laminated transition in Saanich Inlet,British Columbia[J].Marine Geology,2001,174:341-354.
[15]FRANCOIS R.The study on the regulation of the concern trations of some tracementals(Rb,Sr,Zn,Cu,V,Cr,Ni,Mn,and Mo)in Saanich inlet sediments,British Columbia,Canada[J].Marine Geology,1988,83:258-308.
[16]JONES B,MANNING D A C.Comparion of geochemical indices used for the interpretation of palaeoredox conditions in ancient mudstone[J].Chemical Geology,1994,111(1/2/3/4):111-129.
[17]郑荣才,柳梅青.鄂尔多斯盆地长6油层组古盐度研究[J].石油与天然气地质,1999,20(1):20-25.ZHENG Rongcai,LIU Meiqing.Study on palaeosalinity of Chang-6 oil reservoir set in Ordos basin[J].Oil&Gas Geology,1999,20(1):20-25.
[18]刘刚,周东升.微量元素分析在判别沉积环境中的应用:以江汉盆地潜江组为例[J].石油实验地质,2007,29(3):307-310.LIU Gang,ZHOU Dongsheng.Application of microelements analysis in identifying sedimentary environment:Taking Qianjiang Formation in the Jianghan basin as an example[J].Petroleum Geology&Experiment,2007,29(3):307-310.
[19]CULLERS R L.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,1995,123(1/2/3/4):107-131.
[20]BHATIA M R,CROOK K A W.Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J].Contributions to Mineralogy and Petrology,1986,92(2):181-193.
[21]王国茹.鄂尔多斯盆地北部上古生界物源及层序岩相古地理研究[D].成都:成都理工大学,2011.
[22]赵庆英,李刚,刘正宏,等.内蒙古大青山地区沙德盖岩体特征及成因[J].吉林大学学报(地球科学版),2009,39(6):1073-1079.ZHAO Qingying,LI Gang,LIU Zhenghong,et al.Characteristics and origin of the Shadegai pluton in the Daqingshan area,Inner Mongolia[J].Journal of Jilin University(Earth Science Edition),2009,39(6):1073-1079.
[23]刘平华,刘福来,蔡佳,等.华北克拉通孔兹岩带中段大青山-乌拉山变质杂岩立甲子基性麻粒岩年代学及地球化学研究[J].岩石学报,2013,29(2):462-484.LIU Pinghua,LIU Fulai,CAI Jia,et al.Geochronological and geochemical study of the Lijiazi mafic granulites from the Daqingshan-Wulashan metamorphic complex,the central Khondalite belt in the North China Craton[J].Acta Petrologica Sinica,2013,29(2):462-484.
[24]罗婷婷,周立发.鄂尔多斯盆地南缘下石盒子组碎屑岩地球化学特征[J].西北大学学报(自然科学版),2013,43(5):765-775.LUO Tingting,ZHOU Lifa.Geochemistry characteristic of theclastic rocks from Xiashihezi Formation in the south of Ordos basin[J].Journal of Northwest University(Natural Science Edition),2013,43(5):765-775.