大兴安岭中南段下二叠统寿山沟组典型泥岩地球化学特征及其地质意义
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摘要
西乌珠穆沁旗地区下二叠统寿山沟组泥岩为大兴安岭中南段发育的较好烃源岩.通过对寿山沟组泥岩中的主量、微量、稀土元素特征的分析,深入剖析了寿山沟组的物源、构造背景及其风化作用.岩石样品ICV值分布于1.15～1.57,平均值为1.33,认为样品基本未受到二次成岩作用影响.通过A-CN-K三角图判断寿山沟组泥岩受到一定的钾交代作用,经过校正得到CIA_(corr)值为54.28～70.06,平均值为65.33,表明物源区经历了初等—中等的化学风化作用.通过主量-微量元素多变量物源区环境分析,认为寿山沟组泥质沉积物主要来源于长英质物源区,且混有少量铁镁质火山岩源区物质,其构造背景为大陆岛弧.综合分析认为,大兴安岭中南段下二叠统寿山沟组泥岩的沉积特征归因于古亚洲洋二叠纪初期洋壳的俯冲作用.
The mudstones of Lower Permian Shoushangou Formation in Xi Ujimqin Qi of Inner Mongolia are welldeveloped source rocks in middle-south Daxinganling Mountains. With study on the characteristics of major,trace and rare earth elements in the mudstones, the paper analyzes the provenance, tectonic setting and weathering of Shoushangou Formation in depth. The ICV values of rock samples ranging from 1.15 to 1.57(averagely 1.33)show that the samples are basically not affected by secondary diagenesis. According to the A-CN-K triangular diagram,the mudstones are subjected to certain K-metasomatism. The CIA_(corr) values of 54.28-70.06(averagely 65.33) are gained after correction,indicating the provenance has experienced primary-moderate weathering. Based on the analysis on the multivariable environment of major and trace elements,it is concluded that the argillaceous sediments of Shoushangou Formation are mainly derived from the felsic provenance,mixed with minus materials from the femic volcanic rock provenance,under the tectonic background of continental island arc. From the above,it is thought that the sedimentary features of the mudstones in the study area are attributed to the subduction of the Paleo-Asian Oceanic crust in early Permian.
The mudstones of Lower Permian Shoushangou Formation in Xi Ujimqin Qi of Inner Mongolia are welldeveloped source rocks in middle-south Daxinganling Mountains. With study on the characteristics of major,trace and rare earth elements in the mudstones, the paper analyzes the provenance, tectonic setting and weathering of Shoushangou Formation in depth. The ICV values of rock samples ranging from 1.15 to 1.57(averagely 1.33)show that the samples are basically not affected by secondary diagenesis. According to the A-CN-K triangular diagram,the mudstones are subjected to certain K-metasomatism. The CIA_(corr) values of 54.28-70.06(averagely 65.33) are gained after correction,indicating the provenance has experienced primary-moderate weathering. Based on the analysis on the multivariable environment of major and trace elements,it is concluded that the argillaceous sediments of Shoushangou Formation are mainly derived from the felsic provenance,mixed with minus materials from the femic volcanic rock provenance,under the tectonic background of continental island arc. From the above,it is thought that the sedimentary features of the mudstones in the study area are attributed to the subduction of the Paleo-Asian Oceanic crust in early Permian.
引文
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[24]Bhatia M R.Rare earth element geochemistry of Australian Paleozoic graywackes and mudrocks:Provenance and tectonic control[J].Sedimentary Geology,1985,45(1):97-113.
[25]刘彬,王学求.长江中下游地区早古生代沉积岩地球化学特征及其构造背景与物源分析[J].大地构造与成矿学,2018,42(1):163-176.
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[27]李徐生,韩志勇,杨守业,等.镇江下蜀土剖面的化学风化强度与元素迁移特征[J].地理学报,2007,62(11):1174-1184.
[28]徐小涛,邵龙义.利用泥质岩化学蚀变指数分析物源区风化程度时的限制因素[J].古地理学报,2018,20(3):515-522.
[29]Cox R,Lowe D R,Cullers R L.The influence of sediment recycling and basement composition on evolution of mudrock chemistry in the southwestern United States[J].Geochim Cosmochim Acta,1995,59(14):2919-2940.
[30]Kamp P C,Leake B E.Petrography and geochemistry of feldspathic and mafic sediments of the northeastern Pacific margin[J].Transactions of the Royal Society of Edinburgh Earth Sciences,1985,76(4):411-449.
[31]Nesbitt H W,Young G M.Prediction of some weathering trends of plutonic and volcanic rocks based on thermodynamic and kinetic considerations[J].Geochimica et Cosmochimica Acta,1984,48(7):1523-1534.
[32]Nesbitt H W,Young G M.Formation and diagenesis of weathering Profiles[J].Journal of Geology,1989,97(2):129-147.
[33]Panahi A,Young G M,Rainbird R H.Behavior of major and trace elements(including REE)during Paleoproterozoic pedogenesis and diagenetic alteration of an Archean granite near Ville Marie,Québec,Canada[J].Geochimica et Cosmochimica Acta,2000,64(13):2199-2220.
[34]闫臻,王宗起,王涛,等.秦岭造山带泥盆系形成构造环境:来自碎屑岩组成和地球化学方面的约束[J].岩石学报,2007,23(5):1023-1042.
[35]Roser B P,Korsch R J.Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of majorelement data[J].Chemical Geology,1988,67(1):119-139.
[36]田洋,赵小明,王令占,等.鄂西南利川三叠纪须家河组地球化学特征及其对风化、物源与构造背景的指示[J].岩石学报,2015,31(1):261-272.
[37]Girty G H,Ridge D L,Knaack C.Provenance and depositional setting of Paleozoic chert and argillite,Sierra Nevada,California[J].Journal of Sedimentary Research,1996,66(1):107-118.
[38]张力强,顾雪祥,章永梅,等.西天山博罗科努地区古生代地层物源分析及构造意义[J].矿物岩石地球化学通报,2014,33(5):582-597.
[39]Floyd P A,Leveridge B E.Tectonic environment of the Devonian Gramscatho basin,south Cornwall:Framework mode and geochemical evidence from turbiditic sandstones[J].Journal of the Geological Society,1987,144(4):531-542.
[40]Bhatia M R,Crook K A W.Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J].Contributions to Mineralogy&Petrology,1986,92(2):181-193.
[41]李双应,杨栋栋,等.南天山中段上石炭统碎屑岩岩石学、地球化学、重矿物和锆石年代学特征及其对物源区、构造演化的约束[J].地质学报,2014,88(2):167-184.
[42]路远发.Geo Kit:一个用VBA构建的地球化学工具软件包[J].地球化学,2004,33(5):459-464.
[2]王成文,马志红,孙跃武,等.晚古生代海相地层——东北地区油气勘查的一个新层系[J].世界地质,2008,27(2):113-118.
[3]周建波,张兴洲,马志红,等.中国东北地区的构造格局与盆地演化[J].石油与天然气地质,2009,30(5):530-538.
[4]韩春元,金凤鸣,王静,等.内蒙古二连盆地上古生界油气勘探前景[J].地质通报,2011,30(Z1):243-249.
[5]公繁浩,黄欣,郑月娟,等.内蒙古西乌旗下二叠统寿山沟组海底扇的发现及意义[J].地质与资源,2013,22(6):478-483.
[6]公繁浩,黄欣,陈树旺,等.内蒙古西乌珠穆沁旗地区寿山沟组烃源岩有机地球化学特征[J].地质通报,2013,32(8):1322-1328.
[7]Wronkiewicz D J,Condie K C.Geochemistry and provenance of sediments from the Pongola Supergroup,South Africa:Evidence for a3.0-Ga-old continental craton[J].Geochimica et Cosmochimica Acta,1989,53(7):1537-1549.
[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]Nesbitt H W,Young G M,Mc Lennan S M,et al.Effects of chemical weathering and sorting on the petrogenesis of siliciclastic sediments,with implications for provenance studies[J].Journal of Geology,1996,104(5):525-542.
[10]Nesbitt H W,Young G M.Petrogenesis of sediments in the absence of chemical weathering:Effects of abrasion and sorting on bulk composition and mineralogy[J].Sedimentology,1996,43(2):341-358.
[11]Mc Lennan S M.Weathering and global denudation[J].Journal of Geology,1993,101(2):295-303.
[12]Cullers R L.The geochemistry of shales,siltstones and sandstones of Pennsylvanian-Permian age,Colorado,USA:Implications for provenance and metamorphic studies[J].Lithos,2000,51(3):181-203.
[13]陶继雄,白立兵,宝音乌力吉,等.内蒙古满都拉地区二叠纪俯冲造山过程的岩石记录[J].地质调查与研究,2003,26(4):241-249.
[14]李朋武,高锐,管烨,等.内蒙古中部索伦-林西缝合带封闭时代的古地磁分析[J].吉林大学学报:地球科学版,2006,36(5):744-758.
[15]李大鹏,陈岳龙,王忠,等.内蒙古中-东部兴蒙造山带古生代沉积记录:对物源特征及中亚造山带构造演化的指示[J].科学通报,2012,57(7):647-656.
[16]吕志成,段国正,郝立波,等.大兴安岭中段二叠系大石寨组细碧岩的岩石学地球化学特征及其成因探讨[J].岩石学报,2002,18(2):212-222.
[17]鲍庆中,张长捷,吴之理,等.内蒙古东南部西乌珠穆沁旗地区石炭纪-二叠纪岩石地层和层序地层[J].地质通报,2006,25(5):572-579.
[18]晨辰,张志诚,郭召杰,等.内蒙古达茂旗满都拉地区早二叠世基性岩的年代学、地球化学及其地质意义[J].中国科学:地球科学,2012,42(3):343-358.
[19]徐备,赵盼,鲍庆中,等.兴蒙造山带前中生代构造单元划分初探[J].岩石学报,2014,30(7):1841-1857.
[20]胡兆珣,郑春子.吉林桦甸早二叠世寿山沟组的苔藓虫[J].微体古生物学报,1984,1(1):72-81,117-118.
[21]郑月娟,公繁浩,陈树旺,等.内蒙古西乌珠穆沁旗地区下二叠统原寿山沟组碎屑锆石LA-ICP-MSU-Pb年龄及地质意义[J].地质通报,2013,32(8):1260-1268.
[22]Garzanti E,Padoan M,AndòS,et al.Weathering and relative durability of detrital minerals in equatorial climate:Sand petrology and geochemistry in the East African Rift[J].Journal of Geology,2013,121(6):547-580.
[23]Taylor S R,Mc Lennan S M.The continental crust:Its composition and evolution,an examination of the geochemical record preserved in sedimentary rocks[J].Journal of Geology,1985,94(4):632-633.
[24]Bhatia M R.Rare earth element geochemistry of Australian Paleozoic graywackes and mudrocks:Provenance and tectonic control[J].Sedimentary Geology,1985,45(1):97-113.
[25]刘彬,王学求.长江中下游地区早古生代沉积岩地球化学特征及其构造背景与物源分析[J].大地构造与成矿学,2018,42(1):163-176.
[26]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.
[27]李徐生,韩志勇,杨守业,等.镇江下蜀土剖面的化学风化强度与元素迁移特征[J].地理学报,2007,62(11):1174-1184.
[28]徐小涛,邵龙义.利用泥质岩化学蚀变指数分析物源区风化程度时的限制因素[J].古地理学报,2018,20(3):515-522.
[29]Cox R,Lowe D R,Cullers R L.The influence of sediment recycling and basement composition on evolution of mudrock chemistry in the southwestern United States[J].Geochim Cosmochim Acta,1995,59(14):2919-2940.
[30]Kamp P C,Leake B E.Petrography and geochemistry of feldspathic and mafic sediments of the northeastern Pacific margin[J].Transactions of the Royal Society of Edinburgh Earth Sciences,1985,76(4):411-449.
[31]Nesbitt H W,Young G M.Prediction of some weathering trends of plutonic and volcanic rocks based on thermodynamic and kinetic considerations[J].Geochimica et Cosmochimica Acta,1984,48(7):1523-1534.
[32]Nesbitt H W,Young G M.Formation and diagenesis of weathering Profiles[J].Journal of Geology,1989,97(2):129-147.
[33]Panahi A,Young G M,Rainbird R H.Behavior of major and trace elements(including REE)during Paleoproterozoic pedogenesis and diagenetic alteration of an Archean granite near Ville Marie,Québec,Canada[J].Geochimica et Cosmochimica Acta,2000,64(13):2199-2220.
[34]闫臻,王宗起,王涛,等.秦岭造山带泥盆系形成构造环境:来自碎屑岩组成和地球化学方面的约束[J].岩石学报,2007,23(5):1023-1042.
[35]Roser B P,Korsch R J.Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of majorelement data[J].Chemical Geology,1988,67(1):119-139.
[36]田洋,赵小明,王令占,等.鄂西南利川三叠纪须家河组地球化学特征及其对风化、物源与构造背景的指示[J].岩石学报,2015,31(1):261-272.
[37]Girty G H,Ridge D L,Knaack C.Provenance and depositional setting of Paleozoic chert and argillite,Sierra Nevada,California[J].Journal of Sedimentary Research,1996,66(1):107-118.
[38]张力强,顾雪祥,章永梅,等.西天山博罗科努地区古生代地层物源分析及构造意义[J].矿物岩石地球化学通报,2014,33(5):582-597.
[39]Floyd P A,Leveridge B E.Tectonic environment of the Devonian Gramscatho basin,south Cornwall:Framework mode and geochemical evidence from turbiditic sandstones[J].Journal of the Geological Society,1987,144(4):531-542.
[40]Bhatia M R,Crook K A W.Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J].Contributions to Mineralogy&Petrology,1986,92(2):181-193.
[41]李双应,杨栋栋,等.南天山中段上石炭统碎屑岩岩石学、地球化学、重矿物和锆石年代学特征及其对物源区、构造演化的约束[J].地质学报,2014,88(2):167-184.
[42]路远发.Geo Kit:一个用VBA构建的地球化学工具软件包[J].地球化学,2004,33(5):459-464.
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