辽东桓仁西部古元古代侵入岩年代学及岩石地球化学
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摘要
华北克拉通东部辽东地区出露古元古代侵入岩,为准确认识辽东地区古元古代构造演化过程,选取北沟岩体、正岔岩体和树柳林子岩体的岩相学、岩石地球化学及年代学特征,探讨了岩体的形成时代、岩石成因及其构造环境。锆石SHRIMP U-Pb年代学研究表明,柳林子岩体年龄为(2 490±8) Ma,北沟岩体年龄为(2 457±11) Ma。北沟岩体高硅富钾,富集Rb、U、Th、K等大离子亲石元素,亏损Nb、Ti、P等高场强元素,为过铝质高钾钙碱性I型花岗岩,Nb/Ta平均值5. 75,Rb/Nb平均值4. 21,源于太古宙古老地壳的部分熔融;正岔岩体高硅富钾,富集Rb、Ba、U、Th、K等大离子亲石元素,亏损Nb、Ti、P等高场强元素,为弱过铝质高钾钙碱性A型花岗岩,Nb/Ta平均值16. 06,Rb/Nb平均值4. 81,源区可能由幔源岩浆底侵带来的热量加热地壳,导致其重熔并与之混合后形成的。柳林子岩体为变质角闪辉长岩,呈亚碱性,富集Rb、Ba、K等大离子亲石元素,亏损Nb、Ti、P等高场强元素,显示其岩浆可能形成于受陆壳微弱混染的软流圈地幔或岩石圈地幔。认为研究区古元古代侵入岩形成于东、西陆块碰撞拼合后的后造山挤压向板内伸展转换的构造环境,为构造体质转换的产物。
Paleoproterozoic intrusive rocks are widespread in the Eastern Liaoning Province( ELP),which is located in the eastern North China Craton( NCC). This paper reported the petrography,geochemistry and geochronology of the Beigou,Zhengcha and Liulinzi plutons in the Kaiyuan area of the eastern part of the northern NCC margin. We discussed the formation age,petrogenesis and tectonic environment of these plutons. Zircon U-Pb dating shows that both the Liulinzi( 2,490 ± 8 Ma) and Beigou( 2,457 ± 11 Ma) plutons were formed in the Early Paleoproterozoic. The Beigou intrusive rocks have higher Si O2 and K2 O contents,and are enriched inlarge ion lithophile elements( LILEs,e. g.,Rb,K,U and Th) but depleted in high field strength elements( HFSEs,e. g.,P,Nb and Ti),with Nb/Ta = 5. 75 and Rb/Nb = 4. 21. These features indicate that the Beigou pluton is metaluminous calc-alkaline I-type granite,which was likely originated from the partial melting of lower crust. The Zhengcha pluton samples have higher SiO2 and K2 O contents. They are also enriched in LILEs and depleted in HFSEs,with Nb/Ta = 16. 06 and Rb/Nb = 4. 81. These features indicate that the Zhengcha pluton is metaluminous calc-alkaline A-type granite,which was most likely originated from the partial melting of lower crust with minor mantle-derived input. The Liulinzi meta-gabbro is sub-alkaline,enriched in LILEs and depleted in HFSEs,indicating that the magma may have derived from the depleted mantle with crustal contamination in an intracontinental extension setting. Combined with previous studies,magmatic rocks of the study area may have formed under a compressional to extensional tectonic transition regime after the collision between the Eastern block and the Western block of the NCC.
Paleoproterozoic intrusive rocks are widespread in the Eastern Liaoning Province( ELP),which is located in the eastern North China Craton( NCC). This paper reported the petrography,geochemistry and geochronology of the Beigou,Zhengcha and Liulinzi plutons in the Kaiyuan area of the eastern part of the northern NCC margin. We discussed the formation age,petrogenesis and tectonic environment of these plutons. Zircon U-Pb dating shows that both the Liulinzi( 2,490 ± 8 Ma) and Beigou( 2,457 ± 11 Ma) plutons were formed in the Early Paleoproterozoic. The Beigou intrusive rocks have higher Si O2 and K2 O contents,and are enriched inlarge ion lithophile elements( LILEs,e. g.,Rb,K,U and Th) but depleted in high field strength elements( HFSEs,e. g.,P,Nb and Ti),with Nb/Ta = 5. 75 and Rb/Nb = 4. 21. These features indicate that the Beigou pluton is metaluminous calc-alkaline I-type granite,which was likely originated from the partial melting of lower crust. The Zhengcha pluton samples have higher SiO2 and K2 O contents. They are also enriched in LILEs and depleted in HFSEs,with Nb/Ta = 16. 06 and Rb/Nb = 4. 81. These features indicate that the Zhengcha pluton is metaluminous calc-alkaline A-type granite,which was most likely originated from the partial melting of lower crust with minor mantle-derived input. The Liulinzi meta-gabbro is sub-alkaline,enriched in LILEs and depleted in HFSEs,indicating that the magma may have derived from the depleted mantle with crustal contamination in an intracontinental extension setting. Combined with previous studies,magmatic rocks of the study area may have formed under a compressional to extensional tectonic transition regime after the collision between the Eastern block and the Western block of the NCC.
引文
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[3]侯贵廷,李江海,刘玉琳,等.华北克拉通古元古代末的伸展事件:拗拉谷与岩墙群[J].自然科学进展,2005,15(11):1366-1373.
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[7]LI Sanzhong,ZHEN Sheng,LIU Yongjiang.Stratification of metamorphic belts and its genesis in the Liaohe Group[J].Chinese Science Bulletin,1998,43(5):430-434.
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[11]杨进辉,吴福元,谢烈文,等.辽东矿洞沟正长岩成因及其构造意义:锆石原位微区U-Pb年龄和Hf同位素制约[J].岩石学报,2007,23(2):263-276.
[12]路孝平,吴福元,张艳斌,等.吉林南部通化地区古元古代辽吉花岗岩的侵位年代与形成构造背景[J].岩石学报,2004,20(3):381-392.
[13]COMPSTON D,WILLIANS I S,KIRSCHVINK J L,et al.Zircon U-Pb ages from the Early Cambrian times-scale[J].Journal of Geological Society of London,1992,149:171-179.
[14]LUDWIG K R.User's Manual for Isoplot 3.0:A Geochronological Toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center,2003:1-20.
[15]IRVINE T H,BARAGAR W R.A guide to the chemical classification of the common volcanic rocks[J].Canadian Journal of Earth Sciences,1971,8(5):523-548.
[16]RICKWOOD P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].Lithos,1989,22(4):247-263.
[17]MANIAR P,PICCOL P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
[18]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[19]WHALEN J B,CURRIE K L,CHAPELL B W.A-type granites:geochemical characteristics and petrogenesis[J].Contributions to Mineralogy and Petrology,1987,95(4):407-419.
[20]WHELAN J F,COBB J C.Stable isotope geochemistry of sphalerite and other mineral matter in coal beds of the Illinois and Forest City basins[J].Economic Geology,1988,83(5):990-1007.
[21]李玉静,王玉芳,徐国新,等.冀东分水岭岩体锆石U-Pb年代学、地球化学特征及地质意义[J].地质学报,2018,92(9):1904-1917.
[22]SUN Jinlong,REN Yunsheng,YANG Yushan,et al.Re-Os isotopic dating of molybdenite from Taipingcun Mo deposit in eastern Hebei and its geological significance[J].Global Geology,2016,35(3):738-751.
[23]TAYLOR S R,MCLENNAN S M.The Continental Crust:Its Composition and Evolution[M].Boston:Blackwell Scientific Publication,1985:57-72.
[24]LOISELLE M C,WONES D R.Characteristics and origin of anorogenic granites[J].Geological Society of America Bulletin,1979,11:468.
[25]PITCHER W S.The Nature and Origin of Granite[M].London:Blackie Academic and Professional,1993:1-316.
[26]FROST C D,FROST B R.On ferroan(A-type)granitoids:Their compositional variability and modes of origin[J].Journal of Petrology,2011,52(1):39-53.
[27]林强,葛文春,吴福元,等.大兴安岭中生代花岗岩类地球化学[J].岩石学报,2004,20(3):403-412.
[28]杨明春,陈斌,闫聪.华北克拉通胶-辽-吉带古元古代条痕状花岗岩成因及其构造意义[J].地球科学与环境学报,2015,37(5):32-53.
[29]FREY F A,PRINZ M.Ultramafic inclusions from San Carlos,Arizona:Petrologic and geochemical data bearing on their petrogenesis[J].Earth and Planetary Science Letters,1978,38(1):129-176.
[30]GROVE T L,DONNELLY-NOLAN J M.The evolution of young silicic lavas at Medicine Lake Volcano,California:Implications for the origin of compositional gaps in calc-alkaline series lavas[J].Contributions to Mineralogy and Petrology,1986,92(3):281-302.
[31]HOFMANN A W.Chemical differentiation of the Earth:The relationship between mantle,continental crust,and oceanic crust[J].Earth and Planetary Science Letters,1988,90(3):297-314.
[32]RUDNICK R L,GAO S,LING W L,et al.Petrology and geochemistry of spinel peridotite xenoliths from Hannuoba and Qixia,North China Craton[J].Lithos,2004,77(1/4):609-637.
[33]TAYLOR S R,MCLENNAN S M.The geochemical evolution of the continental crust[J].Reviews of Geophysics,2016,33(2):241-265.
[34]PEARCE J A,HARRIS N B W,TINDLE A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
[35]宋运红,杨凤超,闫国磊,等.辽东地区古元古代花岗岩SHRIMP U-Pb年龄、Hf同位素组成及构造意义[J].地质学报,2016,90(10):2620-2636.
[36]杨凤超,宋运红,赵玉岩.辽宁盘岭矿集区花岗岩锆石SHRIMP U-Pb年龄、Hf同位素组成及地质意义[J].吉林大学学报(地球科学版),2017,47(5):1430-1440.
[37]王艺芬,徐贵忠,佘宏全.辽东地区早元古代火山岩特征及其形成的动力学背景[J].现代地质,2005,19(3):316-323.
[38]李超,孙克克,陈斌.辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义[J].地球科学与环境学报,2017,39(2):144-159.
[39]郝德峰,李三忠,赵国春,等.辽吉地区古元古代花岗岩成因及对构造演化的制约[J].岩石学报,2004,20(6):1409-1416.
[40]李三忠,杨振声,刘永江,等.胶辽吉地区古元古代早期花岗岩的侵位模式及其与隆滑构造的关系[J].岩石学报,1997,13(2):189-202.
[41]李三忠,郝德峰,韩宗珠,等.胶辽地块古元古代构造-热演化与深部过程[J].地质学报,2003,77(3):328-340.
[42]杨明春,陈斌,闫聪.吉南地区古元古代双岔巨斑状花岗岩成因及其构造意义:岩石学、年代学、地球化学和Sr-NdHf同位素证据[J].岩石学报,2015,31(6):1573-1588.
[43]ZHAO Guochun,SUN Min,WILDE S A.Late Archean to Paleoproterozoic evolution of the North China Craton:Key issues revisited[J].Precambrian Research,2005,136(2):177-202.
[44]BATCHELOR R A,BOWDEN P.Petrogenetic interpretation of granitoid rock series using multi-cationic parameters[J].Chemical Geology,1985,21:43-55.
[45]刘军,刘福兴,李生辉,等.辽宁省小佟家堡子金矿床流体包裹体及同位素地球化学特征[J].现代地质,2018,32(4):631-645.
[46]BARBARIN B.A review of the relationships between granitoid types,their origins and their geodynamic environments[J].Lithos,1999,46:605-626.
[47]WANG Y L,ZHANG C J.Th/Hf-Ta/Hf identification of tectonic setting of basalts[J].Acta Petrologica Sinica,2001,17(3):413-421.
[2]SANTOSH M,SAJEEV K,LI J H.Extreme crustal metamorphism during Columbia supercontinent assembly:Evidence from North China Craton[J].Gondwana Research,2006,10(3/4):256-266.
[3]侯贵廷,李江海,刘玉琳,等.华北克拉通古元古代末的伸展事件:拗拉谷与岩墙群[J].自然科学进展,2005,15(11):1366-1373.
[4]WILDE S A,ZHAO G C,SUN M.Development of the North China during the late Archean and its final amalgamation at 1.8Ga:some speculation on its position within a global Paleoproterowic supercontinent[J].Gondwana Research,2002,5:85-94.
[5]刘树文,王伟,白翔,等.前寒武纪地球动力学(Ⅶ):早期大陆地壳的形成与演化[J].地学前缘,2015,22(6):97-108.
[6]李三忠,杨振声.胶辽地块古元古代花岗岩类型及成因[J].西北地质,1997,18(3):21-26.
[7]LI Sanzhong,ZHEN Sheng,LIU Yongjiang.Stratification of metamorphic belts and its genesis in the Liaohe Group[J].Chinese Science Bulletin,1998,43(5):430-434.
[8]李厚民,刘明军,李立兴,等.弓长岭铁矿二矿区蚀变岩中锆石SHRIMP U-Pb年龄及地质意义[J].岩石学报,2014,30(5):1205-1217.
[9]LU X P,WU F Y,GUO J H,et al.Zircon U-Pb geochronological constraints on the Paleoproterozoic crustal evolution of the Eastern block in the North China Craton[J].Precambrian Research,2006,146(3/4):138-164.
[10]LI Sanzhong,ZHAO Guochun.SHRIMP U-Pb zircon geochronology of the Liaoji granitoids:Constraints on the evolution of the Paleoproterozoic Jiao-Liao-Ji belt in the Eastern Block of the North China Craton[J].Precambrian Research,2007,158(1/2):1-16.
[11]杨进辉,吴福元,谢烈文,等.辽东矿洞沟正长岩成因及其构造意义:锆石原位微区U-Pb年龄和Hf同位素制约[J].岩石学报,2007,23(2):263-276.
[12]路孝平,吴福元,张艳斌,等.吉林南部通化地区古元古代辽吉花岗岩的侵位年代与形成构造背景[J].岩石学报,2004,20(3):381-392.
[13]COMPSTON D,WILLIANS I S,KIRSCHVINK J L,et al.Zircon U-Pb ages from the Early Cambrian times-scale[J].Journal of Geological Society of London,1992,149:171-179.
[14]LUDWIG K R.User's Manual for Isoplot 3.0:A Geochronological Toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center,2003:1-20.
[15]IRVINE T H,BARAGAR W R.A guide to the chemical classification of the common volcanic rocks[J].Canadian Journal of Earth Sciences,1971,8(5):523-548.
[16]RICKWOOD P C.Boundary lines within petrologic diagrams which use oxides of major and minor elements[J].Lithos,1989,22(4):247-263.
[17]MANIAR P,PICCOL P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101(5):635-643.
[18]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[19]WHALEN J B,CURRIE K L,CHAPELL B W.A-type granites:geochemical characteristics and petrogenesis[J].Contributions to Mineralogy and Petrology,1987,95(4):407-419.
[20]WHELAN J F,COBB J C.Stable isotope geochemistry of sphalerite and other mineral matter in coal beds of the Illinois and Forest City basins[J].Economic Geology,1988,83(5):990-1007.
[21]李玉静,王玉芳,徐国新,等.冀东分水岭岩体锆石U-Pb年代学、地球化学特征及地质意义[J].地质学报,2018,92(9):1904-1917.
[22]SUN Jinlong,REN Yunsheng,YANG Yushan,et al.Re-Os isotopic dating of molybdenite from Taipingcun Mo deposit in eastern Hebei and its geological significance[J].Global Geology,2016,35(3):738-751.
[23]TAYLOR S R,MCLENNAN S M.The Continental Crust:Its Composition and Evolution[M].Boston:Blackwell Scientific Publication,1985:57-72.
[24]LOISELLE M C,WONES D R.Characteristics and origin of anorogenic granites[J].Geological Society of America Bulletin,1979,11:468.
[25]PITCHER W S.The Nature and Origin of Granite[M].London:Blackie Academic and Professional,1993:1-316.
[26]FROST C D,FROST B R.On ferroan(A-type)granitoids:Their compositional variability and modes of origin[J].Journal of Petrology,2011,52(1):39-53.
[27]林强,葛文春,吴福元,等.大兴安岭中生代花岗岩类地球化学[J].岩石学报,2004,20(3):403-412.
[28]杨明春,陈斌,闫聪.华北克拉通胶-辽-吉带古元古代条痕状花岗岩成因及其构造意义[J].地球科学与环境学报,2015,37(5):32-53.
[29]FREY F A,PRINZ M.Ultramafic inclusions from San Carlos,Arizona:Petrologic and geochemical data bearing on their petrogenesis[J].Earth and Planetary Science Letters,1978,38(1):129-176.
[30]GROVE T L,DONNELLY-NOLAN J M.The evolution of young silicic lavas at Medicine Lake Volcano,California:Implications for the origin of compositional gaps in calc-alkaline series lavas[J].Contributions to Mineralogy and Petrology,1986,92(3):281-302.
[31]HOFMANN A W.Chemical differentiation of the Earth:The relationship between mantle,continental crust,and oceanic crust[J].Earth and Planetary Science Letters,1988,90(3):297-314.
[32]RUDNICK R L,GAO S,LING W L,et al.Petrology and geochemistry of spinel peridotite xenoliths from Hannuoba and Qixia,North China Craton[J].Lithos,2004,77(1/4):609-637.
[33]TAYLOR S R,MCLENNAN S M.The geochemical evolution of the continental crust[J].Reviews of Geophysics,2016,33(2):241-265.
[34]PEARCE J A,HARRIS N B W,TINDLE A G.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J].Journal of Petrology,1984,25(4):956-983.
[35]宋运红,杨凤超,闫国磊,等.辽东地区古元古代花岗岩SHRIMP U-Pb年龄、Hf同位素组成及构造意义[J].地质学报,2016,90(10):2620-2636.
[36]杨凤超,宋运红,赵玉岩.辽宁盘岭矿集区花岗岩锆石SHRIMP U-Pb年龄、Hf同位素组成及地质意义[J].吉林大学学报(地球科学版),2017,47(5):1430-1440.
[37]王艺芬,徐贵忠,佘宏全.辽东地区早元古代火山岩特征及其形成的动力学背景[J].现代地质,2005,19(3):316-323.
[38]李超,孙克克,陈斌.辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义[J].地球科学与环境学报,2017,39(2):144-159.
[39]郝德峰,李三忠,赵国春,等.辽吉地区古元古代花岗岩成因及对构造演化的制约[J].岩石学报,2004,20(6):1409-1416.
[40]李三忠,杨振声,刘永江,等.胶辽吉地区古元古代早期花岗岩的侵位模式及其与隆滑构造的关系[J].岩石学报,1997,13(2):189-202.
[41]李三忠,郝德峰,韩宗珠,等.胶辽地块古元古代构造-热演化与深部过程[J].地质学报,2003,77(3):328-340.
[42]杨明春,陈斌,闫聪.吉南地区古元古代双岔巨斑状花岗岩成因及其构造意义:岩石学、年代学、地球化学和Sr-NdHf同位素证据[J].岩石学报,2015,31(6):1573-1588.
[43]ZHAO Guochun,SUN Min,WILDE S A.Late Archean to Paleoproterozoic evolution of the North China Craton:Key issues revisited[J].Precambrian Research,2005,136(2):177-202.
[44]BATCHELOR R A,BOWDEN P.Petrogenetic interpretation of granitoid rock series using multi-cationic parameters[J].Chemical Geology,1985,21:43-55.
[45]刘军,刘福兴,李生辉,等.辽宁省小佟家堡子金矿床流体包裹体及同位素地球化学特征[J].现代地质,2018,32(4):631-645.
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