豫西宜洛盆地上二叠统—下三叠统泥质岩地球化学特征与物源分析
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摘要
宜洛盆地晚二叠世—三叠纪沉积充填演化是秦岭造山带与华北克拉通共同作用的结果,物源分析是揭示盆山耦合的重要手段之一。论文采用沉积地球化学分析的方法对宜洛盆地上二叠统—下三叠统泥质岩地球化学特征与物源进行了研究,结果表明:宜洛盆地泥质岩稀土元素球粒陨石标准化曲线显示轻稀土元素富集,重稀土亏损,为右倾式曲线,元素Eu中度负异常,元素Ce轻微亏损,符合上地壳稀土元素分布特征。泥质岩源区源岩属性判别图解显示,宜洛盆地物源以长英质岩为主,主要来自于上地壳,孙家沟组后期有少量古老基底杂岩混入。构造背景判别图解显示,研究区物源经历了被动大陆边缘为主(孙家沟组下段)—活动大陆边缘为主(孙家沟组上段和刘家沟组)—大陆岛弧为主(和尚沟组)的演化;华北克拉通和秦岭造山带是宜洛盆地重要物源区,华北地台北部内蒙古隆起可能提供了一定量的物源。孙家沟组早期以克拉通内部物源为主,孙家沟组土门段之后秦岭微地块物源供给明显,体现了华北克拉通南缘基底隆升,由被动大陆边缘向秦岭初始"弧-陆"碰撞隆升的构造演化过程。这对深入揭示南华北盆地与周围造山带之间的耦合关系具有重要意义。
The sediment filling and evolution of the Yiluo Basin during the Late Permian to the Triassic resulted from the tectonic movement in the Qinlin orogen and the North China craton,and the provenance analysis is interpreted as one of the important tools for revealing the basin-mountain coupling processes. The geochemical signatures and provenance analysis are treated in the present paper for the Upper Permian to Lower Triassic argillaceous rocks from the Yiluo Basin,western Henan. The argillaceous rocks in the Yiluo Basin are characterized by the LREE enrichment,HREE depletion,moderate Eu anomaly and slight Ce depletion,indicating a dominant upper crust origin,with the mixtures of a small amount of ancient basement complexes in the Sunjiagou Formation.The tectonic settings of the provenances in the study area have gone through the transition from the passive continental margin( the lower member of the Sunjiagou Formation) through the active continental margin( the upper member of the Sunjiagou Formation and the Liujiagou Formation) to the continental island arc( Heshanggou Formation). The Qinlin orogen and the North China craton are believed to be the key provenances for the Yiluo Basin. The cratonic origin during the deposition of the lower member of the Sunjiagou Formation and Qinling origin after the deposition of the Tumen member of the Sunjiagou Formation in the Yiluo Basin indicate the basement uplift on the southern margin of the North China craton,and the tectonic evolution from the passive continental margin to the "arc-continent"collision and uplift of the Qinling block. The results of research in this study are helpful to the understanding of the coupling processes of the southern North China Basin and its surrounding orogenic zones.
The sediment filling and evolution of the Yiluo Basin during the Late Permian to the Triassic resulted from the tectonic movement in the Qinlin orogen and the North China craton,and the provenance analysis is interpreted as one of the important tools for revealing the basin-mountain coupling processes. The geochemical signatures and provenance analysis are treated in the present paper for the Upper Permian to Lower Triassic argillaceous rocks from the Yiluo Basin,western Henan. The argillaceous rocks in the Yiluo Basin are characterized by the LREE enrichment,HREE depletion,moderate Eu anomaly and slight Ce depletion,indicating a dominant upper crust origin,with the mixtures of a small amount of ancient basement complexes in the Sunjiagou Formation.The tectonic settings of the provenances in the study area have gone through the transition from the passive continental margin( the lower member of the Sunjiagou Formation) through the active continental margin( the upper member of the Sunjiagou Formation and the Liujiagou Formation) to the continental island arc( Heshanggou Formation). The Qinlin orogen and the North China craton are believed to be the key provenances for the Yiluo Basin. The cratonic origin during the deposition of the lower member of the Sunjiagou Formation and Qinling origin after the deposition of the Tumen member of the Sunjiagou Formation in the Yiluo Basin indicate the basement uplift on the southern margin of the North China craton,and the tectonic evolution from the passive continental margin to the "arc-continent"collision and uplift of the Qinling block. The results of research in this study are helpful to the understanding of the coupling processes of the southern North China Basin and its surrounding orogenic zones.
引文
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[18]李明龙,郑德顺,戴光忠,等.豫西济源盆地侏罗系泥质岩地球化学特征及其环境和物源示踪[J].地质学报,2014,88(2):228-238.
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[22]Dean W E,Gardner J V,Piper D Z.Inorganic geochemical indicators of glacial-interglacial changes in productivity and anoxia on the California continental margin[J].Geochimica et Cosmochimica Acta,1997,61(21):4507-4518.
[23]Bhatia M R.Plate tectonic and geochemical composition of sandstones:Reply[J].Geology,1985,93(1):85-87.
[24]和钟铧,王玉芬,侯伟.漠河盆地中侏罗统砂岩地球化学特征及物源属性分析[J].沉积与特提斯地质,2008,28(4):93-100.
[25]Gu X X,Liu J M,Zheng M H,et al.Provenance and Tectonic Setting of the Proterozoic Turbidites in Hunan,South China:Geochemical Evidence[J].Journal of Sedimentary Research,2002,72(3):393-407.
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[27]Allegre C T.Quantitative models of trace plant[J].Earth Plant,1978,38(1):1-20.
[28]白斌,周立发,刘彬辉,等.南华北上二叠统石千峰组物源与沉积环境分析[J].西北大学学报自然科学版,2006,36(3):461-466.
[29]Yu H,Zhang H F,Li X H,et al.Tectonic evolution of the North Qinling Orogen from subduction to collision and exhumation:Evidence from zircons in metamorphic rocks of the Qinling Group[A].中国科学院地质与地球物理研究所2015年度[C].2016.65-78.
[30]张国伟,孟庆任.秦岭造山带的造山过程及其动力学特征[J].中国科学:地球科学,1996,26(3):193-200.
[31]杨文涛,杜远生.豫西济源盆地中生代泥岩地球化学特征对物源区的指示[J].地球科学:中国地质大学学报,2017,(1):53-67.
[32]孙小勇,牟传龙,葛祥英,等.四川广元-陕西镇巴地区上奥陶统五峰组地球化学特征及沉积环境意义[J].沉积与特提斯地质,2016,36(1):46-54.
[2]刘少峰,张国伟.东秦岭-大别山及邻区盆-山系统演化与动力学[J].地质通报,2008,27(12):1943-1960.
[3]于炳松,裘愉卓.贵州地区新元古代—三叠纪沉积岩中稀土元素地球化学特征与地壳演化[J].现代地质,1998,(2):173-179.
[4]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.
[5]王惠勇.豫西洛阳-伊川地区晚古生代、早中生代沉积体系与岩相古地理恢复[D].青岛:山东科技大学,2006.
[6]姚纪明,于炳松,陈建强,等.中扬子北缘上侏罗统—白垩系沉积岩地球化学特征与构造背景分析[J].地球化学,2009,38(3):231-241.
[7]Mc Lennan S M,Hemming S,Mc Daniel D K,et al.Geochemical approaches to sedimentation,provenance,and tectonics[J].GSA Special Publication,1993,284:21-40.
[8]杜远生,殷鸿福,王治平.秦岭造山带晚加里东-早海西期的盆地格局与构造演化[J].地球科学-中国地质大学学报,1997,22(4):401-405.
[9]Dong Y,Santosh M.Tectonic architecture and multiple orogeny of the Qinling Orogenic Belt,Central China[J].Gondwana Research,2015,29(1):1-40.
[10]张利伟,杨文涛,牛永斌.河南宜阳地区陆相二叠系—三叠系界线附近微生物成因沉积构造特征及意义[J].地质论评,2014,60(5):1051-1060.
[11]Chu D,Tong J,Bottjer D J,et al.Microbial mats in the terrestrial Lower Triassic of North China and implications for the Permian-Triassic mass extinction[J].Palaeogeography Palaeoclimatology Palaeoecology,2017,474:214-231.
[12]朱淑慧,白万备,乔雨.潭头盆地恐龙化石埋藏层位古气候和物源分析[J].河南理工大学学报自然科学版,2015,34(6):784-790.
[13]方国庆,刘德良.复理石杂砂岩的化学组成与板块构造[J].沉积与特提斯地质,2000,20(3):105-112.
[14]郝奕玮,骆满生,徐增连,等.华北陆块新元古代-中生代沉积盆地划分及其构造演化[J].地球科学,2014,(8):1230-1242.
[15]吴智平,马在平,周瑶琪.济源盆地三叠系与侏罗系界线地层沉积相及元素地球化学特征[J].中国石油大学学报自然科学版,2002,26(3):20-25.
[16]吴贤涛.豫西济源-义马盆地浊流沉积中的痕迹化石及其环境意义[J].沉积学报,1985,3(3):23-31.
[17]陈世悦.华北地块南部晚古生代至三叠纪沉积构造演化[J].中国矿业大学学报,2000,29(5):536-540.
[18]李明龙,郑德顺,戴光忠,等.豫西济源盆地侏罗系泥质岩地球化学特征及其环境和物源示踪[J].地质学报,2014,88(2):228-238.
[19]Boynton W V.Chapter 3—Cosmochemistry of the Rare Earth Elements:Meteorite Studies[J].Developments in Geochemistry,1984,2(2):63-114.
[20]Rudnick R L,Gao S.Composition of the Continental Crust[A].Treatise on Geochemistry[C].Elsevier Ltd.20014,1-51.
[21]Pratt L M,Comer J B,Brassell S C,et al.Geochemistry of organic matter in sediments and sedimentary rocks:text for short course No.27[J].Sedimentary Geology,1992,27:1-27
[22]Dean W E,Gardner J V,Piper D Z.Inorganic geochemical indicators of glacial-interglacial changes in productivity and anoxia on the California continental margin[J].Geochimica et Cosmochimica Acta,1997,61(21):4507-4518.
[23]Bhatia M R.Plate tectonic and geochemical composition of sandstones:Reply[J].Geology,1985,93(1):85-87.
[24]和钟铧,王玉芬,侯伟.漠河盆地中侏罗统砂岩地球化学特征及物源属性分析[J].沉积与特提斯地质,2008,28(4):93-100.
[25]Gu X X,Liu J M,Zheng M H,et al.Provenance and Tectonic Setting of the Proterozoic Turbidites in Hunan,South China:Geochemical Evidence[J].Journal of Sedimentary Research,2002,72(3):393-407.
[26]Floyd P A,Leveridge B E.Tectonic environment of the Devonian Gramscatho basin,south Cornwall:Framework mode and geochemical evidence from turbidite sandstones[J].Journal of the Geological Society,1987,144(4):531-542.
[27]Allegre C T.Quantitative models of trace plant[J].Earth Plant,1978,38(1):1-20.
[28]白斌,周立发,刘彬辉,等.南华北上二叠统石千峰组物源与沉积环境分析[J].西北大学学报自然科学版,2006,36(3):461-466.
[29]Yu H,Zhang H F,Li X H,et al.Tectonic evolution of the North Qinling Orogen from subduction to collision and exhumation:Evidence from zircons in metamorphic rocks of the Qinling Group[A].中国科学院地质与地球物理研究所2015年度[C].2016.65-78.
[30]张国伟,孟庆任.秦岭造山带的造山过程及其动力学特征[J].中国科学:地球科学,1996,26(3):193-200.
[31]杨文涛,杜远生.豫西济源盆地中生代泥岩地球化学特征对物源区的指示[J].地球科学:中国地质大学学报,2017,(1):53-67.
[32]孙小勇,牟传龙,葛祥英,等.四川广元-陕西镇巴地区上奥陶统五峰组地球化学特征及沉积环境意义[J].沉积与特提斯地质,2016,36(1):46-54.