思茅陆块东缘二叠世末期碎屑锆石U-Pb年代学及微量元素组成研究
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摘要
本文对采自云南哀牢山构造带西侧、思茅陆块东缘二叠纪末的四个砂岩样品中的碎屑锆石进行了LA-ICP-MS U-Pb年龄和微量元素测试,所有样品的年龄谱都显示出250～290 Ma的显著特征峰, XD37、XD40还得到900～1000 Ma的主特征峰和400～600 Ma的次特征峰;另外两个样品XD41和XD50也具有400～600 Ma和900～1000 Ma的特征峰,但是锆石数量较少。绝大部分的碎屑锆石微量元素都指示其源岩来自岩浆弧/造山带构造环境。结合前人研究成果,我们认为这些砂岩沉积于一个靠近思茅陆块边缘的弧后盆地,该弧后盆地可能是哀牢山洋二叠纪自东向西俯冲消减而产生。
In this study, we present new U-Pb ages and trace element concentrations of detrital zircon grains from the Late Permian strata in the eastern margin of the Simao Block. All the four samples show a significant detrital zircon age peak at 250 – 290 Ma. Two samples(XD37 and XD40) also contain a major age peak at 900 – 1000 Ma and a minor age peak at 400 – 600 Ma, while the other two samples(XD41 and XD50) show similar age peaks although relatively less zircons were dated. The features of trace elements suggest that the detrital zircons came from an igneous arc or orgenic belt. Based on these data, we suggest that the Late Permian strata in the east margin of the Simao Block were deposited in a back-arc basin related to the westward subduction of the Ailaoshan Ocean.
In this study, we present new U-Pb ages and trace element concentrations of detrital zircon grains from the Late Permian strata in the eastern margin of the Simao Block. All the four samples show a significant detrital zircon age peak at 250 – 290 Ma. Two samples(XD37 and XD40) also contain a major age peak at 900 – 1000 Ma and a minor age peak at 400 – 600 Ma, while the other two samples(XD41 and XD50) show similar age peaks although relatively less zircons were dated. The features of trace elements suggest that the detrital zircons came from an igneous arc or orgenic belt. Based on these data, we suggest that the Late Permian strata in the east margin of the Simao Block were deposited in a back-arc basin related to the westward subduction of the Ailaoshan Ocean.
引文
段新华,赵鸿.论哀牢山?藤条河断裂--古板块俯冲带.高校地质学报,55(4):258-266
莫宣学,邓晋福,董方浏,喻学惠,王勇,周肃,杨伟光.2001.西南三江造山带火山岩?构造组合及其意义.高校地质学报,7(2):121-138.
沈上越,魏启荣,程惠兰,莫宣学.1998.“三江”哀牢山?李仙江带火山岩构造岩浆类型.矿物岩石,18(2):18-24.
王铠元.1993.论哀牢山构造?变质带的几个主要问题.云南地质,12(1):130-135.
魏启荣,沈上越.1997.哀牢山区太忠?李仙江带上二叠统(P2)弧火山岩.矿物岩石,17(2):8-16.
云南省地矿局,1990.云南省区域地质志.北京:地质出版社.
张旗,赵大升,周德进.1992.三江地区超镁铁岩的特征及其产出的构造背景.矿物岩石地球化学通报,11(4):243-245.
张旗,周德进,赵大升,彭兴阶,罗万,林邀,刘祥品.1996.滇西古特提斯造山带的威尔逊旋回:岩浆活动记录和深部过程讨论.岩石学报,12(1):17-28.
钟大赉.1998.滇川西部古特提斯造山带.北京:科学出版社.
Black L P,Kamo S L,Allen C M,Aleinikoff J N,Davis D W,Korsch R and Foudoulis C.2003.TEMORA 1:A new zircon standard for Phanerozoic U-Pb geochronology.Chemical Geology,200:155-170.
Cawood P,Wang Y J,Xu Y J and Zhao G C.2013.Locating South China in Rodinia and Gondwana:A fragment of greater India lithosphere?Geology,41:903-906.
Escayola M P,Pimentel M M and Armstrong R.2007.Neoproterozoic backarc basin:Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges,Argentina.Geology,35:495-498.
Fan W M,Wang Y J,Zhang A M,Zhang F F and Zhang Y Z.2010.Permian arc-back-arc basin development along the Ailaoshan tectonic zone:Geochemical,isotopic and geochronological evidence from the Mojiang volcanic rocks,Southwest China.Lithos,119:553-568.
Faure M,Lepvrier C,Nguyen V V,Vu T V,Lin W and Chen Z C.2014.The South China block-Indochina collision:Where,when,and how?Journal of Asian Earth Sciences,79:260-274.
Fedo C M,Sircombe K N and Rainbird R H.2003.Detrital zircon analysis of the sedimentary record.Reviews in Mineralogy and Geochemistry,53:277-303.
Fernández-Suárez S J,Gutiérrez-Alonso G,Jenner G A and Tubrett M N.2000.New ideas on the Proterozoic-Early Palaeozoic evolution of NW Iberia:Insights from U-Pb detrital zircon ages.Precambrian Research,102:185-206.
Grimes C B,John B E,Kelemen P B,Mazdab F K,Wooden J L,Cheadle M J,Hangh?j K and Schwartz J J.2007.Trace element chemistry of zircons from oceanic crust:A method for distinguishing detrital zircon provenance.Geology,35:643-646.
Hoskin P W O.2003.The composition of zircon and igneous and metamorphic petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62.
Hoskin P W O and Ireland T R.2000.Rare earth element chemistry of zircon and its use as a provenance indicator.Geology,28(7):627-630.
Jian P,Liu D Y,Kr?ner A,Zhang Q,Wang Y Z,Sun X Mand Zhang W.2009.Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China(I):Geochemistry of ophiolites,arc/back-arc assemblages and within-plate igneous rocks.Lithos,113:748-766.
Jian P,Liu D Y and Sun X M.2008.SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite,southwestern China:Geochronological constraints for the evolution of Paleo-Tethys.Journal of Asian Earth Sciences,32:371-384.
Lai C K,Meffre S,Crawford A J,Zaw K,Halpin J A,Xue CD and Salam A.2014.The Central Ailaoshan ophiolite and modern analogs.Gondwana Research,26:75-88.
Leloup P H,Lacassin R,Tapponnier P,Sch?rer U,Zhong DL,Liu X H,Zhang L S,Ji S C and Trinh P T.1995.The Ailao Shan-Red River shear zone(Yunnan,China),Tertiary transform boundary of Indochina.Tectonophysics,251:13-84.
Liu H C,Wang Y J,Cawood P A,Fan W M,Cai Y F and Xing X W.2015.Record of Tethyan ocean closure and Indosinian collision along the Ailaoshan suture zone(SW China).Gondwana Research,27:1292-1306.
Liu Y S,Hu Z C,Gao S,Günther D,Xu J,Gao C G and Chen H H.2008.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard.Chemical Geology,257:34-43.
Ludwig K.2003.User’s manual for Isoplot 3.00:A geochronological toolkit for Microsoft Excel.
McLennan S M and Taylor S R.1988.Crustal evolution:Comments on“The Archean-Proterozoic transition:Evidence from the geochemistry of metasedimentary rocks from the Guyana and Montana”by A.K.Gibbs,C.W.Montgomery,P.A.O’day and E.A.Erslev.Geochimica et Cosmochimica Acta,52:785-787.
Metcalfe I.1996.Gondwanaland dispersion,Asian accretion and evolution of eastern Tethys.Australian Journal of Earth Sciences,43:605-623.
Metcalfe I.2002.Permian tectonic framework and palaeogeography of SE Asian.Journal of Asian Earth Sciences,20:551-566.
Metcalfe I.2006.Palaeozoic and Mesozoic tectonic evolution and palaeogeography of East Asian crustal fragments:The Korean Peninsula in context.Gondwana Research,9:24-46.
Metcalfe I.2011.Tectonic framework and Phanerozoic evolution of Sundaland.Gondwana Research,19:3-21.
Metcalfe I.2013.Gondwana dispersion and Asian accretion:Tectonic and palaeogeographic evolution of eastern Tethys.Journal of Asian Earth Sciences,66:1-33.
Suess E.1893.Are great ocean depths permanent?Natural Science,2(13):180-187.
Sun S S and McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Geological Society,London,Special Publications,42:313-315.
Wang W,Qu Q M and Zhu M.2010.A brief review of the Middle Palaeozoic vertebrates from Southeast Asia.Palaeoworld,19:27-36.
Wiedenbeck M,AlléP,Corfu F,Griffin W L,Meier M,Oberli F,Quadt A V,Roddick J C and Spiegel W.1995.Three natural zircon standards for U-Th-Pb,Lu-Hf,trace element and REE analyses.Geostandards Newsletter,19:1-23.
Xia X P,Nie X S,Lai C K,Wang Y J,Long X P and Meffre S.2016.Where was the Ailaoshan Ocean and when did it open:A perspective based on detrital zircon U-Pb age and Hf isotope evidence.Gondwana Research,36:488-502.
Yang J H,Cawood P A,Du Y S,Huang H and Hu L S.2012.Detrital record of Indosinian mountain building in SWChina:Provenance of the Middle Triassic turbidites in the Youjiang Basin.Tectonophysics,574-575:105-117.
Zi J W,Cawood P,Fan W M,Wang Y J and Tohver E.2012.Contrasting rift and subduction-related plagiogranites in the Jinshajiang ophiolitic mélange,southwest China,and implications for the Paleo-Tethys.Tectonics,31.TC2012.
莫宣学,邓晋福,董方浏,喻学惠,王勇,周肃,杨伟光.2001.西南三江造山带火山岩?构造组合及其意义.高校地质学报,7(2):121-138.
沈上越,魏启荣,程惠兰,莫宣学.1998.“三江”哀牢山?李仙江带火山岩构造岩浆类型.矿物岩石,18(2):18-24.
王铠元.1993.论哀牢山构造?变质带的几个主要问题.云南地质,12(1):130-135.
魏启荣,沈上越.1997.哀牢山区太忠?李仙江带上二叠统(P2)弧火山岩.矿物岩石,17(2):8-16.
云南省地矿局,1990.云南省区域地质志.北京:地质出版社.
张旗,赵大升,周德进.1992.三江地区超镁铁岩的特征及其产出的构造背景.矿物岩石地球化学通报,11(4):243-245.
张旗,周德进,赵大升,彭兴阶,罗万,林邀,刘祥品.1996.滇西古特提斯造山带的威尔逊旋回:岩浆活动记录和深部过程讨论.岩石学报,12(1):17-28.
钟大赉.1998.滇川西部古特提斯造山带.北京:科学出版社.
Black L P,Kamo S L,Allen C M,Aleinikoff J N,Davis D W,Korsch R and Foudoulis C.2003.TEMORA 1:A new zircon standard for Phanerozoic U-Pb geochronology.Chemical Geology,200:155-170.
Cawood P,Wang Y J,Xu Y J and Zhao G C.2013.Locating South China in Rodinia and Gondwana:A fragment of greater India lithosphere?Geology,41:903-906.
Escayola M P,Pimentel M M and Armstrong R.2007.Neoproterozoic backarc basin:Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges,Argentina.Geology,35:495-498.
Fan W M,Wang Y J,Zhang A M,Zhang F F and Zhang Y Z.2010.Permian arc-back-arc basin development along the Ailaoshan tectonic zone:Geochemical,isotopic and geochronological evidence from the Mojiang volcanic rocks,Southwest China.Lithos,119:553-568.
Faure M,Lepvrier C,Nguyen V V,Vu T V,Lin W and Chen Z C.2014.The South China block-Indochina collision:Where,when,and how?Journal of Asian Earth Sciences,79:260-274.
Fedo C M,Sircombe K N and Rainbird R H.2003.Detrital zircon analysis of the sedimentary record.Reviews in Mineralogy and Geochemistry,53:277-303.
Fernández-Suárez S J,Gutiérrez-Alonso G,Jenner G A and Tubrett M N.2000.New ideas on the Proterozoic-Early Palaeozoic evolution of NW Iberia:Insights from U-Pb detrital zircon ages.Precambrian Research,102:185-206.
Grimes C B,John B E,Kelemen P B,Mazdab F K,Wooden J L,Cheadle M J,Hangh?j K and Schwartz J J.2007.Trace element chemistry of zircons from oceanic crust:A method for distinguishing detrital zircon provenance.Geology,35:643-646.
Hoskin P W O.2003.The composition of zircon and igneous and metamorphic petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62.
Hoskin P W O and Ireland T R.2000.Rare earth element chemistry of zircon and its use as a provenance indicator.Geology,28(7):627-630.
Jian P,Liu D Y,Kr?ner A,Zhang Q,Wang Y Z,Sun X Mand Zhang W.2009.Devonian to Permian plate tectonic cycle of the Paleo-Tethys Orogen in southwest China(I):Geochemistry of ophiolites,arc/back-arc assemblages and within-plate igneous rocks.Lithos,113:748-766.
Jian P,Liu D Y and Sun X M.2008.SHRIMP dating of the Permo-Carboniferous Jinshajiang ophiolite,southwestern China:Geochronological constraints for the evolution of Paleo-Tethys.Journal of Asian Earth Sciences,32:371-384.
Lai C K,Meffre S,Crawford A J,Zaw K,Halpin J A,Xue CD and Salam A.2014.The Central Ailaoshan ophiolite and modern analogs.Gondwana Research,26:75-88.
Leloup P H,Lacassin R,Tapponnier P,Sch?rer U,Zhong DL,Liu X H,Zhang L S,Ji S C and Trinh P T.1995.The Ailao Shan-Red River shear zone(Yunnan,China),Tertiary transform boundary of Indochina.Tectonophysics,251:13-84.
Liu H C,Wang Y J,Cawood P A,Fan W M,Cai Y F and Xing X W.2015.Record of Tethyan ocean closure and Indosinian collision along the Ailaoshan suture zone(SW China).Gondwana Research,27:1292-1306.
Liu Y S,Hu Z C,Gao S,Günther D,Xu J,Gao C G and Chen H H.2008.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard.Chemical Geology,257:34-43.
Ludwig K.2003.User’s manual for Isoplot 3.00:A geochronological toolkit for Microsoft Excel.
McLennan S M and Taylor S R.1988.Crustal evolution:Comments on“The Archean-Proterozoic transition:Evidence from the geochemistry of metasedimentary rocks from the Guyana and Montana”by A.K.Gibbs,C.W.Montgomery,P.A.O’day and E.A.Erslev.Geochimica et Cosmochimica Acta,52:785-787.
Metcalfe I.1996.Gondwanaland dispersion,Asian accretion and evolution of eastern Tethys.Australian Journal of Earth Sciences,43:605-623.
Metcalfe I.2002.Permian tectonic framework and palaeogeography of SE Asian.Journal of Asian Earth Sciences,20:551-566.
Metcalfe I.2006.Palaeozoic and Mesozoic tectonic evolution and palaeogeography of East Asian crustal fragments:The Korean Peninsula in context.Gondwana Research,9:24-46.
Metcalfe I.2011.Tectonic framework and Phanerozoic evolution of Sundaland.Gondwana Research,19:3-21.
Metcalfe I.2013.Gondwana dispersion and Asian accretion:Tectonic and palaeogeographic evolution of eastern Tethys.Journal of Asian Earth Sciences,66:1-33.
Suess E.1893.Are great ocean depths permanent?Natural Science,2(13):180-187.
Sun S S and McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Geological Society,London,Special Publications,42:313-315.
Wang W,Qu Q M and Zhu M.2010.A brief review of the Middle Palaeozoic vertebrates from Southeast Asia.Palaeoworld,19:27-36.
Wiedenbeck M,AlléP,Corfu F,Griffin W L,Meier M,Oberli F,Quadt A V,Roddick J C and Spiegel W.1995.Three natural zircon standards for U-Th-Pb,Lu-Hf,trace element and REE analyses.Geostandards Newsletter,19:1-23.
Xia X P,Nie X S,Lai C K,Wang Y J,Long X P and Meffre S.2016.Where was the Ailaoshan Ocean and when did it open:A perspective based on detrital zircon U-Pb age and Hf isotope evidence.Gondwana Research,36:488-502.
Yang J H,Cawood P A,Du Y S,Huang H and Hu L S.2012.Detrital record of Indosinian mountain building in SWChina:Provenance of the Middle Triassic turbidites in the Youjiang Basin.Tectonophysics,574-575:105-117.
Zi J W,Cawood P,Fan W M,Wang Y J and Tohver E.2012.Contrasting rift and subduction-related plagiogranites in the Jinshajiang ophiolitic mélange,southwest China,and implications for the Paleo-Tethys.Tectonics,31.TC2012.