保山地体新元古代——早古生代沉积岩碎屑锆石年代学及其构造意义
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摘要
滇西潞西地区位于青藏高原东南缘,大地构造位置上属于保山地体。由于新生代强烈的陆内变形作用,保山地体与青藏高原腹地体的对应关系难以确定。野外观察及LA-ICP-MS锆石U-Pb测年结果表明,潞西新元古代—早古生代地层(震旦系—寒武系蒲满哨群及下奥陶统大矿山组)大部分碎屑锆石Th/U>0.1,说明其大多为岩浆成因。U-Pb年龄跨度较大,太古宙—早古生代都有分布,且具有明显的562Ma、892Ma及2265Ma年龄峰,以及较弱的1680Ma和2550Ma年龄峰。保山地体潞西地区沉积岩碎屑锆石年龄分布特征与特提斯喜马拉雅、南羌塘沉积地层碎屑锆石年龄分布特征相似,说明其具有相同的物源——冈瓦纳大陆北部的印度大陆。在新元古代晚期—早古生代,保山地体位于印度大陆北缘,与南羌塘、喜马拉雅地体相邻。伴随着俯冲相关的增生造山过程,保山地体形成相应的新元古代末期—早古生代沉积地层。
The Luxi area of west Yun'nan which belongs to Baoshan terrane is located on the southeastern margin of the Tibetan Plateau. It is difficult to confirm the relationship between Baoshan terrane and Tibetan Plateau due to the strong deformation in Cenozoic. Based on the field study and LA-ICP-MS U-Pb dating, the authors hold that most detrital zircons of Neoproterozoic to early Paleozoic strata in Luxi area have high Th/U ratios(>0.1), which corresponds to the features of magmatic zircons. Zircon UPb ages are distributed from Archean to Early Paleozoic, with age peaks showing strong peaks of Cambrian(562 Ma), Neoproterozoic(890 Ma), Paleoproterozoic(2292 Ma), and some weaker age peaks of Mesoproterozoic(1676 Ma) and Neoproterozoic(2500 Ma). The detrital zircon age distribution pattern in Baoshan terrane is similiar to that in South Qiangtang and Tethys Himalayan sedimentary strata, indicating that they were all derived from the Indian block located on the northern margin of Gondwanaland. From late Neoproterozoic to Early Paleozoic, Baoshen terrane was located on the northern margin of India block, adjacent to the north Qiangtang and Himalayan terrane. During the accretionary orogenic process related to the subduction, the late Newproterozoic to Early Paleozoic sedimentary strata were formed in the Baoshan terrane.
The Luxi area of west Yun'nan which belongs to Baoshan terrane is located on the southeastern margin of the Tibetan Plateau. It is difficult to confirm the relationship between Baoshan terrane and Tibetan Plateau due to the strong deformation in Cenozoic. Based on the field study and LA-ICP-MS U-Pb dating, the authors hold that most detrital zircons of Neoproterozoic to early Paleozoic strata in Luxi area have high Th/U ratios(>0.1), which corresponds to the features of magmatic zircons. Zircon UPb ages are distributed from Archean to Early Paleozoic, with age peaks showing strong peaks of Cambrian(562 Ma), Neoproterozoic(890 Ma), Paleoproterozoic(2292 Ma), and some weaker age peaks of Mesoproterozoic(1676 Ma) and Neoproterozoic(2500 Ma). The detrital zircon age distribution pattern in Baoshan terrane is similiar to that in South Qiangtang and Tethys Himalayan sedimentary strata, indicating that they were all derived from the Indian block located on the northern margin of Gondwanaland. From late Neoproterozoic to Early Paleozoic, Baoshen terrane was located on the northern margin of India block, adjacent to the north Qiangtang and Himalayan terrane. During the accretionary orogenic process related to the subduction, the late Newproterozoic to Early Paleozoic sedimentary strata were formed in the Baoshan terrane.
引文
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[5]Metcalfe I.Palaeozoic and Mesozoic tectonic evolution and palaeogeography of East Asian crustal fragments:The Korean Peninsula in context[J].Gondwana Research,2006,9(1/2):24-46.
[6]Morley C K.Nested strike-slip duplexes,and other evidence for Late Cretaceouse Palaeogene transpressional tectonics before and during Indiae Eurasia collision,in Thailand,Myanmar and Malaysia[J].Journal of the Geological Society,London,2004,161:799-812.
[7]Kapp P,DeCelles P G,Gehrels G E,et al.Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet[J].GSA Bulletin,2007,119(7/8):917-932.
[8]Searle M P,Noble S R,Cottle J M,et al.Tectonic evolution of the Mogok metamorphic belt,Burma(Myanmar):Constrained by U-Th-Pb dating of metamorphic and magmatic rocks[J].Tectonics,2007,26:1-24.
[9]Xu Z Q,Wang Q,Cai Z H,et al.Kinematics of the Tengchong Terrane in SE Tibet from the late Eocene to early Miocene:Insights from coeval mid-crustal detachments and strike-slip shear zones[J].Tectonophysics,2015,8:127-148.
[10]Chen F K,Li X H,Wang X L,et al.Zircon age and Nd-Hf isotopic composition of the Yunnan Tethyan belt,southwestern China[J].International Journal of Earth Sciences,2007,96(6):1179-1194.
[11]Liu S,Hu R Z,Gao S,et al.U-Pb zircon,geochemical and SrNd-Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong-Baoshan Block,Western Yunnan Province,SW China[J].Journal of Asian Earth Sciences,2008,36:168-182.
[12]刘琦胜,叶培盛,吴中海.滇西高黎贡山南段奥陶纪花岗岩SHRIMP锆石U-Pb测年和地球化学特征[J].地质通报,2012,31(2):250-257.
[13]董美玲,董国臣,莫宣学,等.滇西保山地块早古生代花岗岩类的年代学、地球化学及意义[J].岩石学报,2012,28(5):1453-1464.
[14]Wang Y J,Xing X W,Peter A,et al.Petrogenesis of early Paleozoic peraluminous granite in the Sibumasu Block of SWYunnan and iachronous accretionary orogenesis along the northern margin of Gondwana[J].Lithos,2013,182:67-85.
[15]蔡志慧,许志琴,段向东,等.青藏高原东南缘滇西早古生代早期造山事件[J].岩石学报,2013,29(6):223-2140.
[16]Gehrels G E,DeCelles P G,Martin A,et al.Initiation of the Himalayan orogen as an Early Paleozoic thin-skinned thrust belt[J].GSA Today,2003,13(9):4-9.
[17]Decelles P G,Gehrels G E,Quade J,et al.Tectonic implications of U-Pb zircon ages of the himalayan orogenic belt in nepal[J].Science,2000,288(5465):497-499.
[18]Godin L,Parrish R R,Brown R L,et al.Crustal thickening leading to exhumation of the Himalayan metamorphic core of central Nepal:Insight from U-Pb geochronology and40Ar/39Ar thermochronology[J].Tectonics,2001,20(5):729-747.
[19]Miller C,Th?ni M,Frank W,et al.The early Palaeozoic magmatic event in the Northwest,Himalaya,India:source,tectonic setting and age of emplacement[J].Geological Magazine,2001,138(3):237-251.
[20]Marquer D,Chawla H S,Challandes N.Pre-Alpine high-grade metamorphism in the High Himalaya crystalline sequences:Evidence from Lower Palaeozoic Kinnaaur Kailas granite and surrounding rocks in Sutlej Valley(Himal Ptadesch,India)[J].Eclogae Geologicae Helvetiae,2000,93:207-220.
[21]Lee J,Hacker B R,Dinklage W S,et al.Evolution of the Kangmar Dome,southern Tibet:Structural,petrologic,and thermochronologic constraints[J].Tectonics,2000,19(5):872-895.
[22]许志琴,杨经绥,梁凤华,等.喜马拉雅地体的泛非-早古生代造山事件年龄记录[J].岩石学报,2005,21(1):1-12.
[23]Cawood P A,Johnson M R W,Nemchin A A.Early Palaeozoic orogenesis along the Indian margin of Gondwana:Tectonic response to Gondwana assembly[J].Earth and Planetary Science Letters,2007,255(1):70-84.
[24]Cawood P A.Terra Australis Orogen:Rodinia breakup and development of the Pacific and Iapetus margins of Gondwana during the Neoproterozoic and Paleozoic[J].Earth-Science Reviews,2005,69(3/4):249-279.
[25]张泽明,王金丽,沈昆,等.环东冈瓦纳大陆周缘的古生代造山作用:东喜马拉雅构造结南迎巴瓦岩群的岩石学和年代学证据[J].岩石学报,2008,24(7):1627-1637.
[26]戚学祥,李化启,李天福,等.东喜马拉雅构造结南迦巴瓦群高压麻粒岩中含石榴石花岗岩脉锆石SHRIMP U-Pb定年及其折返作用[J].岩石学报,2010,26(3):975-984.
[27]Pullen A,Kapp P,Gehrels G E,et al.Metamorphic rocks in central Tibet:Lateral variations and implications for crustal structure[J].Geological Society of America Bulletin,2011,123(3/4):585-600.
[28]Wang X,Zhang J,Santosh M,et al.Andean-type orogeny in the Himalayas of south Tibet:Implications for early Paleozoic tectonics along the Indian margin of Gondwana[J].Lithos,2012,154(4):248-262.
[29]Zhu D C,Zhao Z D,Niu Y,et al.Cambrian bimodal volcanism in the Lhasa Terrane,southern Tibet:Record of an early Paleozoic Andean-type magmatic arc in the Australian proto-Tethyan margin[J].Chemical Geology,2012,328(11):290-308.
[30]毛晓长,尹福光,唐渊,等.保山地块西缘早古生代增生造山作用[J].地球科学-中国地质大学学报,2014,8:1129-1139.
[31]杨学俊,贾小川,熊昌利,等.滇西高黎贡山南段公养河群变质基性火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2012,31(2):264-276.
[32]徐晓尹,蔡志慧,陈希节,等.保山地体寒武纪基性火山岩及其大地构造意义[J].地质通报,2017,36(7):1104-1117.
[33]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,2009,28(4):481-492.
[34]Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induces melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010,51(1/2):535-571.
[35]Vermeesch P.Multi-sample comparison of detrital age distributions[J].Chemical Geology,2002,191:1-209.
[36]Hoskin P W O,L P Black.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon[J].Geol.,2000,18:423-439.
[37]Mojzsis S J,Harrison T M.Establishment of a 3.83 Ga magmatic age for the Akilia tonalite(southern West Greenland)[J].Earth Planet.Sci.Lett.,2002,202:563-576.
[38]Zhu D C,Zhao Z D,Niu Y,et al.Lhasa terrane in southern Tibet came from Australia[J].Geology,2011,39(8):727-730.
[39]Pullen A,Kapp P,Gehrels G E,et al.Triassic continental subduction in central Tibet and Mediterranean-style closure of the Paleo-Tethys Ocean[J].Geology,2008,36:351-354.
[40]Dong C Y,Li C,Wan Y S,et al.Detrital zircon age model of Ordovician Wenquan quartzite south of Lungmuco-Shuanghu Suture in the Qiangtang area,Tibet:constraint on tectonic affinity and source regions[J].Science China(Earth Sciences),2011,54:1034-1042.
[41]McQuarrie N,Robinson D,Long S,et al.Preliminary stratigraphic and structural architecture of Bhutan:implications for the along strike architecture of the Himalayan system[J].Earth and Planetary Science Letters,2008,272:105-117.
[42]Myrow P M,Hughes N C,Searle M P,et al.Stratigraphic correlation of Cambrian-Ordovician deposits along the Himalaya:implications for the age and nature of rocks in the Mount Everest region[J].Geological Society of America Bulletin,2009,120:323-332.
[43]Myrow P M,Hughes N C,Goodge J W,et al.Extraordinary transport and mixing of sediment across Himalayan central Gondwana during the Cambrian-Ordovician[J].Geological Society of America Bulletin,2010,122:1660-1670.
[44]Gehrels G,Kapp P,DeCelles P,et al.Detrital zircon geochronology of pre-Tertiary strata in the Tibetan-Himalaya orogen[J].Tectonics,2011,30(5):1-27.
[45]Zhu D C,Zhao Z D,Niu Y,et al.The origin and pre-Cenozoic evolution of the Tibetan Plateau[J].Gondwana Research,2012,23:1429-1454.
[46]黄勇,郝家栩,白龙,等.滇西施甸地区晚泛非运动的地层学和岩石学响应[J].地质通报,2012,31(2/3):306-313.(1)
(1)云南地质调查局. 1∶25万潞西市幅区域地质报告, 2008.
[2]Seng?r A M C,Cin A,Rowley D B,et al.Space-time patterns of magmatism along the Tethysides:A preliminary study[J].Journal of Geology,1993,101(1):51-84.
[3]Dewey J F,Shackleton R M,Chang C F,et al.The tectonic evolution of the Tibetan Plateau[J].Philosophical Transactions of the Royal Society of London(Series A):Mathematical and Physical Sciences,1988,327(1594):379-413.
[4]Yin A,Harrison T M.Geologic evolution of the HimalayanTibetan orogen[J].Annual Review of Earth and Planetary Sciences,2000,28(1):211-280.
[5]Metcalfe I.Palaeozoic and Mesozoic tectonic evolution and palaeogeography of East Asian crustal fragments:The Korean Peninsula in context[J].Gondwana Research,2006,9(1/2):24-46.
[6]Morley C K.Nested strike-slip duplexes,and other evidence for Late Cretaceouse Palaeogene transpressional tectonics before and during Indiae Eurasia collision,in Thailand,Myanmar and Malaysia[J].Journal of the Geological Society,London,2004,161:799-812.
[7]Kapp P,DeCelles P G,Gehrels G E,et al.Geological records of the Lhasa-Qiangtang and Indo-Asian collisions in the Nima area of central Tibet[J].GSA Bulletin,2007,119(7/8):917-932.
[8]Searle M P,Noble S R,Cottle J M,et al.Tectonic evolution of the Mogok metamorphic belt,Burma(Myanmar):Constrained by U-Th-Pb dating of metamorphic and magmatic rocks[J].Tectonics,2007,26:1-24.
[9]Xu Z Q,Wang Q,Cai Z H,et al.Kinematics of the Tengchong Terrane in SE Tibet from the late Eocene to early Miocene:Insights from coeval mid-crustal detachments and strike-slip shear zones[J].Tectonophysics,2015,8:127-148.
[10]Chen F K,Li X H,Wang X L,et al.Zircon age and Nd-Hf isotopic composition of the Yunnan Tethyan belt,southwestern China[J].International Journal of Earth Sciences,2007,96(6):1179-1194.
[11]Liu S,Hu R Z,Gao S,et al.U-Pb zircon,geochemical and SrNd-Hf isotopic constraints on the age and origin of Early Palaeozoic I-type granite from the Tengchong-Baoshan Block,Western Yunnan Province,SW China[J].Journal of Asian Earth Sciences,2008,36:168-182.
[12]刘琦胜,叶培盛,吴中海.滇西高黎贡山南段奥陶纪花岗岩SHRIMP锆石U-Pb测年和地球化学特征[J].地质通报,2012,31(2):250-257.
[13]董美玲,董国臣,莫宣学,等.滇西保山地块早古生代花岗岩类的年代学、地球化学及意义[J].岩石学报,2012,28(5):1453-1464.
[14]Wang Y J,Xing X W,Peter A,et al.Petrogenesis of early Paleozoic peraluminous granite in the Sibumasu Block of SWYunnan and iachronous accretionary orogenesis along the northern margin of Gondwana[J].Lithos,2013,182:67-85.
[15]蔡志慧,许志琴,段向东,等.青藏高原东南缘滇西早古生代早期造山事件[J].岩石学报,2013,29(6):223-2140.
[16]Gehrels G E,DeCelles P G,Martin A,et al.Initiation of the Himalayan orogen as an Early Paleozoic thin-skinned thrust belt[J].GSA Today,2003,13(9):4-9.
[17]Decelles P G,Gehrels G E,Quade J,et al.Tectonic implications of U-Pb zircon ages of the himalayan orogenic belt in nepal[J].Science,2000,288(5465):497-499.
[18]Godin L,Parrish R R,Brown R L,et al.Crustal thickening leading to exhumation of the Himalayan metamorphic core of central Nepal:Insight from U-Pb geochronology and40Ar/39Ar thermochronology[J].Tectonics,2001,20(5):729-747.
[19]Miller C,Th?ni M,Frank W,et al.The early Palaeozoic magmatic event in the Northwest,Himalaya,India:source,tectonic setting and age of emplacement[J].Geological Magazine,2001,138(3):237-251.
[20]Marquer D,Chawla H S,Challandes N.Pre-Alpine high-grade metamorphism in the High Himalaya crystalline sequences:Evidence from Lower Palaeozoic Kinnaaur Kailas granite and surrounding rocks in Sutlej Valley(Himal Ptadesch,India)[J].Eclogae Geologicae Helvetiae,2000,93:207-220.
[21]Lee J,Hacker B R,Dinklage W S,et al.Evolution of the Kangmar Dome,southern Tibet:Structural,petrologic,and thermochronologic constraints[J].Tectonics,2000,19(5):872-895.
[22]许志琴,杨经绥,梁凤华,等.喜马拉雅地体的泛非-早古生代造山事件年龄记录[J].岩石学报,2005,21(1):1-12.
[23]Cawood P A,Johnson M R W,Nemchin A A.Early Palaeozoic orogenesis along the Indian margin of Gondwana:Tectonic response to Gondwana assembly[J].Earth and Planetary Science Letters,2007,255(1):70-84.
[24]Cawood P A.Terra Australis Orogen:Rodinia breakup and development of the Pacific and Iapetus margins of Gondwana during the Neoproterozoic and Paleozoic[J].Earth-Science Reviews,2005,69(3/4):249-279.
[25]张泽明,王金丽,沈昆,等.环东冈瓦纳大陆周缘的古生代造山作用:东喜马拉雅构造结南迎巴瓦岩群的岩石学和年代学证据[J].岩石学报,2008,24(7):1627-1637.
[26]戚学祥,李化启,李天福,等.东喜马拉雅构造结南迦巴瓦群高压麻粒岩中含石榴石花岗岩脉锆石SHRIMP U-Pb定年及其折返作用[J].岩石学报,2010,26(3):975-984.
[27]Pullen A,Kapp P,Gehrels G E,et al.Metamorphic rocks in central Tibet:Lateral variations and implications for crustal structure[J].Geological Society of America Bulletin,2011,123(3/4):585-600.
[28]Wang X,Zhang J,Santosh M,et al.Andean-type orogeny in the Himalayas of south Tibet:Implications for early Paleozoic tectonics along the Indian margin of Gondwana[J].Lithos,2012,154(4):248-262.
[29]Zhu D C,Zhao Z D,Niu Y,et al.Cambrian bimodal volcanism in the Lhasa Terrane,southern Tibet:Record of an early Paleozoic Andean-type magmatic arc in the Australian proto-Tethyan margin[J].Chemical Geology,2012,328(11):290-308.
[30]毛晓长,尹福光,唐渊,等.保山地块西缘早古生代增生造山作用[J].地球科学-中国地质大学学报,2014,8:1129-1139.
[31]杨学俊,贾小川,熊昌利,等.滇西高黎贡山南段公养河群变质基性火山岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2012,31(2):264-276.
[32]徐晓尹,蔡志慧,陈希节,等.保山地体寒武纪基性火山岩及其大地构造意义[J].地质通报,2017,36(7):1104-1117.
[33]侯可军,李延河,田有荣.LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,2009,28(4):481-492.
[34]Liu Y S,Gao S,Hu Z C,et al.Continental and oceanic crust recycling-induces melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010,51(1/2):535-571.
[35]Vermeesch P.Multi-sample comparison of detrital age distributions[J].Chemical Geology,2002,191:1-209.
[36]Hoskin P W O,L P Black.Metamorphic zircon formation by solid-state recrystallization of protolith igneous zircon[J].Geol.,2000,18:423-439.
[37]Mojzsis S J,Harrison T M.Establishment of a 3.83 Ga magmatic age for the Akilia tonalite(southern West Greenland)[J].Earth Planet.Sci.Lett.,2002,202:563-576.
[38]Zhu D C,Zhao Z D,Niu Y,et al.Lhasa terrane in southern Tibet came from Australia[J].Geology,2011,39(8):727-730.
[39]Pullen A,Kapp P,Gehrels G E,et al.Triassic continental subduction in central Tibet and Mediterranean-style closure of the Paleo-Tethys Ocean[J].Geology,2008,36:351-354.
[40]Dong C Y,Li C,Wan Y S,et al.Detrital zircon age model of Ordovician Wenquan quartzite south of Lungmuco-Shuanghu Suture in the Qiangtang area,Tibet:constraint on tectonic affinity and source regions[J].Science China(Earth Sciences),2011,54:1034-1042.
[41]McQuarrie N,Robinson D,Long S,et al.Preliminary stratigraphic and structural architecture of Bhutan:implications for the along strike architecture of the Himalayan system[J].Earth and Planetary Science Letters,2008,272:105-117.
[42]Myrow P M,Hughes N C,Searle M P,et al.Stratigraphic correlation of Cambrian-Ordovician deposits along the Himalaya:implications for the age and nature of rocks in the Mount Everest region[J].Geological Society of America Bulletin,2009,120:323-332.
[43]Myrow P M,Hughes N C,Goodge J W,et al.Extraordinary transport and mixing of sediment across Himalayan central Gondwana during the Cambrian-Ordovician[J].Geological Society of America Bulletin,2010,122:1660-1670.
[44]Gehrels G,Kapp P,DeCelles P,et al.Detrital zircon geochronology of pre-Tertiary strata in the Tibetan-Himalaya orogen[J].Tectonics,2011,30(5):1-27.
[45]Zhu D C,Zhao Z D,Niu Y,et al.The origin and pre-Cenozoic evolution of the Tibetan Plateau[J].Gondwana Research,2012,23:1429-1454.
[46]黄勇,郝家栩,白龙,等.滇西施甸地区晚泛非运动的地层学和岩石学响应[J].地质通报,2012,31(2/3):306-313.(1)
(1)云南地质调查局. 1∶25万潞西市幅区域地质报告, 2008.
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