扬子陆块西缘乌拉溪花岗岩体SHRIMP锆石U-Pb定年及地质意义
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摘要
乌拉溪花岗岩体位于扬子陆块西缘的江浪穹窿北侧,为精确厘定其形成时代并探讨岩石成因、构造意义及与里伍式铜矿的关系,对其进行了SHRIMP锆石U-Pb年代学研究。定年结果表明,乌拉溪花岗岩中发育940.3~199.6Ma的锆石,最年轻一组岩浆锆石206Pb/238U加权平均年龄为166.6±1.1Ma(MSWD=2.6,n=6)。结合前人研究成果,认为乌拉溪花岗岩体形成于~166.6Ma,接近邻近的文家坪花岗岩体结晶年龄(~161.5Ma),可能均是松潘—甘孜造山带伸展构造背景下里伍岩群部分熔融的产物。2个岩体年龄大致代表江浪穹窿的成穹时代,后者可能发生于166.6~161.5Ma。此外,花岗岩体结晶年龄与金属硫化物Re-Os定年结果相近,表明江浪穹窿的Cu、W成矿可能与岩浆热液作用相关。
The Wulaxi granite is located in the north side of the Jianglang dome in the western margin of the Yangtze block.In order to accurately determine the formation age of the granite and discuss its petrogenesis,tectonic significance,and relationship with the Liwu-type copper deposits,the SHRIMP zircon U-Pb dating of the granite has been carried out in this study.The results show that the Wulaxi granite contains zircons of numerous ages varying from 940.3 Ma to199.6 Ma,with the youngest magmatic zircons having the206 Pb /238 U weighted mean age of 166.6 ± 1.1 Ma(MSWD =2.6,n = 6).Combining with the previous studies,it is proposed that the Wulaxi granite was formed at ~ 166.6 Ma which was close to the crystallization age of the adjacent Wenjiaping granite(~ 161.5 Ma).They both could be formed by the partial melting of the Liwu group under extensionalenvironment in the Songpan-Garze orogenic belt.The crystallization ages of two granite bodies(166.6-161.5 Ma) could roughly represent the formation age of the Jianglang dome.Moreover,the Re-Os ages of sulfides are close to the crystallization ages of the Wulaxi and Wenjiaping granites,indicating that the Cu and W mineralization coourred in the Jianglang dome were most likely associated with the magmatic hydrothermal fluid activities.
The Wulaxi granite is located in the north side of the Jianglang dome in the western margin of the Yangtze block.In order to accurately determine the formation age of the granite and discuss its petrogenesis,tectonic significance,and relationship with the Liwu-type copper deposits,the SHRIMP zircon U-Pb dating of the granite has been carried out in this study.The results show that the Wulaxi granite contains zircons of numerous ages varying from 940.3 Ma to199.6 Ma,with the youngest magmatic zircons having the206 Pb /238 U weighted mean age of 166.6 ± 1.1 Ma(MSWD =2.6,n = 6).Combining with the previous studies,it is proposed that the Wulaxi granite was formed at ~ 166.6 Ma which was close to the crystallization age of the adjacent Wenjiaping granite(~ 161.5 Ma).They both could be formed by the partial melting of the Liwu group under extensionalenvironment in the Songpan-Garze orogenic belt.The crystallization ages of two granite bodies(166.6-161.5 Ma) could roughly represent the formation age of the Jianglang dome.Moreover,the Re-Os ages of sulfides are close to the crystallization ages of the Wulaxi and Wenjiaping granites,indicating that the Cu and W mineralization coourred in the Jianglang dome were most likely associated with the magmatic hydrothermal fluid activities.
引文
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Crittenden Jr M D.1980.Metamorphic core complexes of the North A-merican Cordillera:Summary.Geological Society of America Memoirs,153:485-492
de Sigoyer J,Vanderhaeghe O,Duchêne S,Billerot A.2014.Generation and emplacement of Triassic granitoids within the Songpan Ganze accretionary-orogenic wedge in a context of slab retreat accommodated by tear faulting,Eastern Tibetan plateau,China.Journal o Asian Earth Sciences,88:192-216
Harris N B W,Pearce J A,Tindle A G.1986.Geochemical characteristics of collision-zone magmatism.Geological Society,London,Special Publications,19:67-81
Hoskin P W O,Schaltegger U.2003.The composition of zircon and igneous and metamorphic petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62
Huang M H,Buick I S,Hou L W.2002.Tectonometamorphic evolution of the eastern Tibet Plateau:Evidence from the central SongpanGarzêorogenic belt,western China.Journal of Petrology,44(2):225-278
Huang M H,Maas R,Buick I S,Williams I S.2003.Crustal response to continental collisions between the Tibet,Indian,South China and North China Blocks:Geochronological constraints from the SongpanGarzêorogenic belt,Western China.Journal of Metamorphic Geology,21(3):223-240
Li Z X,Bogdanova S V,Collins A S,Davidson A,De Waele B,Ernst RE,Fitzsimons I C W,Fuck R A,Gladkochub D P,Jacobs J,Karlstrom K E,Lu S,Natapov L M,Pease V,Pisarevsky S A,Thrane K,Vernikovsky V.2008.Assembly,configuration,and break-up history of Rodinia:A synthesis.Precambrian Research,160(1-2):179-210
Lister G S,Baldwin S L.1993.Plutonism and the origin of metamorphic core complexes.Geology,21(7):607-610
Nance R D,Murphy J B,Santosh M.2014.The supercontinent cycle:A retrospective essay.Gondwana Research,25(1):4-29
Pearce J A,Harris N B W,Tindle A G.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,25(4):956-983
Rino S,Kon Y,Sato W,Maruyama S,Santosh M,Zhao D.2008.The grenvillian and pan-African orogens:World's largest orogenies through geologic time,and their implications on the origin of superplume.Gondwana Research,14(1-2):51-72
Roger F,Malavieille J,Leloup P H,Calassou S,Xu Z.2004.Timing of granite emplacement and cooling in the Songpan-Garzêfold belt(Eastern Tibetan Plateau)with tectonic implications.Journal of Asian Earth Sciences,22(5):465-481
Roger F,Jolivet M,Cattin R,Malavieille J.2011.Mesozoic-Cenozoic tectonothermal evolution of the eastern part of the Tibetan Plateau(Songpan-Garzê,Longmen Shan area):Insights from thermochronological data and simple thermal modelling.Geological Society,London,Special Publications,353(1):9-25
Song H L,Wei B Z.1990.Metamorphic core complexes and its significance in the continental crustal evolution.Journal of China University of Geosciences,1(1):111-121
Sun S S,McD onough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Geological Society,London,Special Publications,42:313-345
Taylor S R,McL ennan S M.1985.The continental crust:Its composition and evolution:An examination of the geochemical record preserved in sedimentary rocks.Oxford:Blackwell,1-328
Xiao L,Zhang H F,Clemens J D,Wang Q W,Kan Z Z,Wang K M,Ni P Z,Liu X M.2007.Late Triassic granitoids of the eastern margin of the Tibetan Plateau:Geochronology,petrogenesis and implications for tectonic evolution.Lithos,96(3-4):436-452
Yan D P,Zhou M F,Song H L,Fu Z R.2003.Structural style and tectonic significance of the Jianglang dome in the eastern margin of the Tibetan Plateau,China.Journal of Structural Geology,25(5):765-779
陈敏华,丁俊,陈道前.2011.四川省九龙县里伍铜田成矿物质来源探讨.沉积与特提斯地质,31(1):89-93
代堰锫,张连昌,王长乐,刘利,崔敏利,朱明田,相鹏.2012.辽宁本溪歪头山条带状铁矿的成因类型、形成时代及构造背景.岩石学报,28(11):3574-3594
冯孝良,刘俨松,张惠华,吴政波,李同柱.2008.四川九龙县里伍铜矿包裹体研究.沉积与特提斯地质,28(2):1-11
傅昭仁,李德威,李先福,王显达.1992.变质核杂岩及剥离断层的控矿构造解析.武汉:中国地质大学出版社,1-185
傅昭仁,宋鸿林,颜丹平.1997.扬子地台西缘江浪变质核杂岩结构及对成矿的控制.地质学报,71(2):113-122
胡健民,孟庆任,石玉若,渠洪杰.2005.松潘-甘孜地体内花岗岩锆石SHRIMP U-Pb定年及其构造意义.岩石学报,21(3):867-880
李建忠,刘宇平,沈战武,马国桃,祝向平,唐高林.2012.四川省九龙县黑牛洞铜锌矿的矿床地质特征、成因及其成矿时代.地质学报,86(12):1972-1993
李同柱,冯孝良,张惠华,唐高林,吴振波,夏祥标.2010.四川里伍铜矿含矿岩系地球化学特征及成因分析.地质与勘探,46(5):921-930
马国桃,马东方,高大发,汪名杰,李建忠,姚鹏,祝向平,陈敏华,梁鲸.2010.四川九龙黑牛洞铜锌矿床地质特征及成因探讨.沉积与特提斯地质,30(2):84-90
四川省地质矿产局.1991.四川省区域地质志.北京:地质出版社,1-680
宋彪,张玉海,刘敦一.2002.微量原位分析仪器SHRIMP的产生与锆石同位素地质年代学.质谱学报,23(1):58-62
宋鸿林.1995.变质核杂岩研究进展、基本特征及成因探讨.地学前缘,2(1-2):103-111
唐高林,王发清,寇林林.2006.里伍铜矿矿床地质特征及找矿前景.四川有色金属,(4):21-25
万传辉,袁静,李芬香,鄢圣武.2011.松潘-甘孜造山带南段晚三叠世兰尼巴和羊房沟花岗岩岩石学、地球化学特征及成因.岩石矿物学杂志,30(2):185-198
许志琴,侯立炜,王宗秀.1992.中国松潘-甘孜造山带的造山过程.北京:地质出版社,1-190
颜丹平,宋鸿林,傅昭仁,田竞亚.1997.扬子地台西缘变质核杂岩带.北京:地质出版社,1-94
姚鹏,汪名杰,李建忠,马国桃,祝向平.2008.里伍式富铜矿床同位素示踪及其成矿地质意义.地球学报,29(6):691-696
袁静,肖龙,万传辉,高睿.2011.松潘-甘孜南部放马坪-三岩龙花岗岩的成因及其构造意义.地质学报,85(2):195-206
张惠华,冯孝良,唐高林,周清,李同柱,祝向平,吴振波,夏祥标.2013.四川省九龙县中咀铜矿构造与成矿关系研究.高校地质学报,19(1):95-108
周家云,谭洪旗,龚大兴,朱志敏,罗丽萍.2013.川西江浪穹隆核部新火山花岗岩LA-ICP-MS锆石U-Pb定年和Hf同位素研究.矿物岩石,33(4):42-52
周家云,谭洪旗,龚大兴,朱志敏,罗丽萍.2014.乌拉溪铝质A型花岗岩:松潘-甘孜造山带早燕山期热隆伸展的岩石记录.地质论评,60(2):348-362
Crittenden Jr M D.1980.Metamorphic core complexes of the North A-merican Cordillera:Summary.Geological Society of America Memoirs,153:485-492
de Sigoyer J,Vanderhaeghe O,Duchêne S,Billerot A.2014.Generation and emplacement of Triassic granitoids within the Songpan Ganze accretionary-orogenic wedge in a context of slab retreat accommodated by tear faulting,Eastern Tibetan plateau,China.Journal o Asian Earth Sciences,88:192-216
Harris N B W,Pearce J A,Tindle A G.1986.Geochemical characteristics of collision-zone magmatism.Geological Society,London,Special Publications,19:67-81
Hoskin P W O,Schaltegger U.2003.The composition of zircon and igneous and metamorphic petrogenesis.Reviews in Mineralogy and Geochemistry,53(1):27-62
Huang M H,Buick I S,Hou L W.2002.Tectonometamorphic evolution of the eastern Tibet Plateau:Evidence from the central SongpanGarzêorogenic belt,western China.Journal of Petrology,44(2):225-278
Huang M H,Maas R,Buick I S,Williams I S.2003.Crustal response to continental collisions between the Tibet,Indian,South China and North China Blocks:Geochronological constraints from the SongpanGarzêorogenic belt,Western China.Journal of Metamorphic Geology,21(3):223-240
Li Z X,Bogdanova S V,Collins A S,Davidson A,De Waele B,Ernst RE,Fitzsimons I C W,Fuck R A,Gladkochub D P,Jacobs J,Karlstrom K E,Lu S,Natapov L M,Pease V,Pisarevsky S A,Thrane K,Vernikovsky V.2008.Assembly,configuration,and break-up history of Rodinia:A synthesis.Precambrian Research,160(1-2):179-210
Lister G S,Baldwin S L.1993.Plutonism and the origin of metamorphic core complexes.Geology,21(7):607-610
Nance R D,Murphy J B,Santosh M.2014.The supercontinent cycle:A retrospective essay.Gondwana Research,25(1):4-29
Pearce J A,Harris N B W,Tindle A G.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,25(4):956-983
Rino S,Kon Y,Sato W,Maruyama S,Santosh M,Zhao D.2008.The grenvillian and pan-African orogens:World's largest orogenies through geologic time,and their implications on the origin of superplume.Gondwana Research,14(1-2):51-72
Roger F,Malavieille J,Leloup P H,Calassou S,Xu Z.2004.Timing of granite emplacement and cooling in the Songpan-Garzêfold belt(Eastern Tibetan Plateau)with tectonic implications.Journal of Asian Earth Sciences,22(5):465-481
Roger F,Jolivet M,Cattin R,Malavieille J.2011.Mesozoic-Cenozoic tectonothermal evolution of the eastern part of the Tibetan Plateau(Songpan-Garzê,Longmen Shan area):Insights from thermochronological data and simple thermal modelling.Geological Society,London,Special Publications,353(1):9-25
Song H L,Wei B Z.1990.Metamorphic core complexes and its significance in the continental crustal evolution.Journal of China University of Geosciences,1(1):111-121
Sun S S,McD onough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Geological Society,London,Special Publications,42:313-345
Taylor S R,McL ennan S M.1985.The continental crust:Its composition and evolution:An examination of the geochemical record preserved in sedimentary rocks.Oxford:Blackwell,1-328
Xiao L,Zhang H F,Clemens J D,Wang Q W,Kan Z Z,Wang K M,Ni P Z,Liu X M.2007.Late Triassic granitoids of the eastern margin of the Tibetan Plateau:Geochronology,petrogenesis and implications for tectonic evolution.Lithos,96(3-4):436-452
Yan D P,Zhou M F,Song H L,Fu Z R.2003.Structural style and tectonic significance of the Jianglang dome in the eastern margin of the Tibetan Plateau,China.Journal of Structural Geology,25(5):765-779
陈敏华,丁俊,陈道前.2011.四川省九龙县里伍铜田成矿物质来源探讨.沉积与特提斯地质,31(1):89-93
代堰锫,张连昌,王长乐,刘利,崔敏利,朱明田,相鹏.2012.辽宁本溪歪头山条带状铁矿的成因类型、形成时代及构造背景.岩石学报,28(11):3574-3594
冯孝良,刘俨松,张惠华,吴政波,李同柱.2008.四川九龙县里伍铜矿包裹体研究.沉积与特提斯地质,28(2):1-11
傅昭仁,李德威,李先福,王显达.1992.变质核杂岩及剥离断层的控矿构造解析.武汉:中国地质大学出版社,1-185
傅昭仁,宋鸿林,颜丹平.1997.扬子地台西缘江浪变质核杂岩结构及对成矿的控制.地质学报,71(2):113-122
胡健民,孟庆任,石玉若,渠洪杰.2005.松潘-甘孜地体内花岗岩锆石SHRIMP U-Pb定年及其构造意义.岩石学报,21(3):867-880
李建忠,刘宇平,沈战武,马国桃,祝向平,唐高林.2012.四川省九龙县黑牛洞铜锌矿的矿床地质特征、成因及其成矿时代.地质学报,86(12):1972-1993
李同柱,冯孝良,张惠华,唐高林,吴振波,夏祥标.2010.四川里伍铜矿含矿岩系地球化学特征及成因分析.地质与勘探,46(5):921-930
马国桃,马东方,高大发,汪名杰,李建忠,姚鹏,祝向平,陈敏华,梁鲸.2010.四川九龙黑牛洞铜锌矿床地质特征及成因探讨.沉积与特提斯地质,30(2):84-90
四川省地质矿产局.1991.四川省区域地质志.北京:地质出版社,1-680
宋彪,张玉海,刘敦一.2002.微量原位分析仪器SHRIMP的产生与锆石同位素地质年代学.质谱学报,23(1):58-62
宋鸿林.1995.变质核杂岩研究进展、基本特征及成因探讨.地学前缘,2(1-2):103-111
唐高林,王发清,寇林林.2006.里伍铜矿矿床地质特征及找矿前景.四川有色金属,(4):21-25
万传辉,袁静,李芬香,鄢圣武.2011.松潘-甘孜造山带南段晚三叠世兰尼巴和羊房沟花岗岩岩石学、地球化学特征及成因.岩石矿物学杂志,30(2):185-198
许志琴,侯立炜,王宗秀.1992.中国松潘-甘孜造山带的造山过程.北京:地质出版社,1-190
颜丹平,宋鸿林,傅昭仁,田竞亚.1997.扬子地台西缘变质核杂岩带.北京:地质出版社,1-94
姚鹏,汪名杰,李建忠,马国桃,祝向平.2008.里伍式富铜矿床同位素示踪及其成矿地质意义.地球学报,29(6):691-696
袁静,肖龙,万传辉,高睿.2011.松潘-甘孜南部放马坪-三岩龙花岗岩的成因及其构造意义.地质学报,85(2):195-206
张惠华,冯孝良,唐高林,周清,李同柱,祝向平,吴振波,夏祥标.2013.四川省九龙县中咀铜矿构造与成矿关系研究.高校地质学报,19(1):95-108
周家云,谭洪旗,龚大兴,朱志敏,罗丽萍.2013.川西江浪穹隆核部新火山花岗岩LA-ICP-MS锆石U-Pb定年和Hf同位素研究.矿物岩石,33(4):42-52
周家云,谭洪旗,龚大兴,朱志敏,罗丽萍.2014.乌拉溪铝质A型花岗岩:松潘-甘孜造山带早燕山期热隆伸展的岩石记录.地质论评,60(2):348-362