松潘—甘孜造山带南缘江浪穹窿文家坪花岗岩成因及地质意义
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摘要
为厘定江浪穹窿文家坪花岗岩的侵位时代并探讨岩石成因,开展了地球化学、锆石U-Pb年代学和Hf同位素研究。文家坪花岗岩岩性为黑云母花岗岩,由石英(约40%)、钾长石(约35%)、黑云母(约15%)及斜长石(<10%)等矿物组成。主微量元素分析表明,江浪穹窿文家坪花岗岩具有高的SiO_2含量(67.70%~70.09%)、Na_2O+K_2O含量(7.43%~7.84%)、Zr+Nb+Ce+Y含量(363×10~(-6)~476×10~(-6))、Mg~#指数(35.9~38.7)及10 000×Ga/Al比值(2.58~2.84),显示右倾的稀土配分型式,富集大离子亲石元素、亏损高场强元素。锆石U-Pb定年与Hf同位素示踪表明,花岗岩结晶年龄为(164.6±0.9)Ma(n=21,MSWD=3.2),ε_(Hf)(t)值介于-13.0~+1.4之间。综合研究提出,文家坪花岗岩属后造山A2型花岗岩,形成于岩石圈伸展构造背景,岩浆源区主要为江浪穹窿核部的中元古界里伍岩群及少量的幔源物质。结合其他地质成果,认为江浪穹窿成穹时代为早—中侏罗世,且区域Cu、W成矿作用很可能与约165 Ma花岗质岩浆活动具有成因联系。
The petrogenesis and emplacement age of the Wenjiaping granite in the Jianglang dome remains unknown. Our petrological and geochemical data show that Wenjiaping granite is biotite granite,which is mainly composed of quartz( ca. 40%),K-feldspar( ca. 35%),biotite( ca. 15%) and plagioclase( < 10%),with high SiO_2( 67. 70%-70. 09%),Na_2O + K_2O( 7. 43%-7. 84%) and Zr + Nb + Ce + Y contents( 363 × 10~(-6)-476 × 10~(-6)),high Mg~#( 35. 9-38. 7) and 10,000 × Ga/Al( 2. 58-2. 84) values. They display enrichmentof LREE and large ion lithophile elements( LILE) and depletion of high field strength elements( HFSE). Zircon U-Pb dating and Hf isotopic tracing indicate that the granite was crystallized at( 164. 6 ± 0. 9) Ma( n = 21,MSWD = 3. 2) with ε_(Hf)( t) values of-13. 0 to + 1. 4. Based on comprehensive studies,we proposed that the Wenjiaping granite belonged to a post-orogenic A2-type granite formed in lithospheric extension. The magma was chiefly originated from the Mesoproterozoic Liwu Group in the core of the Jianglang dome,with minor mantle-derived components. Combined with other geological evidence,we advocated that the doming of the Jianglang dome took place between the Early and Middle Jurassic,and the regional Cu and W mineralization was most likely associated with ca. 165 Ma granitic magmatic activity.
The petrogenesis and emplacement age of the Wenjiaping granite in the Jianglang dome remains unknown. Our petrological and geochemical data show that Wenjiaping granite is biotite granite,which is mainly composed of quartz( ca. 40%),K-feldspar( ca. 35%),biotite( ca. 15%) and plagioclase( < 10%),with high SiO_2( 67. 70%-70. 09%),Na_2O + K_2O( 7. 43%-7. 84%) and Zr + Nb + Ce + Y contents( 363 × 10~(-6)-476 × 10~(-6)),high Mg~#( 35. 9-38. 7) and 10,000 × Ga/Al( 2. 58-2. 84) values. They display enrichmentof LREE and large ion lithophile elements( LILE) and depletion of high field strength elements( HFSE). Zircon U-Pb dating and Hf isotopic tracing indicate that the granite was crystallized at( 164. 6 ± 0. 9) Ma( n = 21,MSWD = 3. 2) with ε_(Hf)( t) values of-13. 0 to + 1. 4. Based on comprehensive studies,we proposed that the Wenjiaping granite belonged to a post-orogenic A2-type granite formed in lithospheric extension. The magma was chiefly originated from the Mesoproterozoic Liwu Group in the core of the Jianglang dome,with minor mantle-derived components. Combined with other geological evidence,we advocated that the doming of the Jianglang dome took place between the Early and Middle Jurassic,and the regional Cu and W mineralization was most likely associated with ca. 165 Ma granitic magmatic activity.
引文
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[2]ROGER F,JOLIVET M,MALAVIEILLE J.The tectonic evolution of the Songpan-Garzê(North Tibet)and adjacent areas from Proterozoic to present:A synthesis[J].Journal of Asian Earth Sciences,2010,39(4):254-269.
[3]胡健民,孟庆任,石玉若,等.松潘—甘孜地体内花岗岩锆石SHRIMP U-Pb定年及其构造意义[J].岩石学报,2005,21(3):867-880.
[4]ROGER F,MALAVIEILLE J,LELOUP P H,et al.Timing of granite emplacement and cooling in the Songpan-Garzêfold belt(eastern Tibetan Plateau)with tectonic implications[J].Journal of Asian Earth Sciences,2004,22(5):465-481.
[5]万传辉,袁静,李芬香,等.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[J].岩石矿物学杂志,2011,30(2):185-198.
[6]袁静,肖龙,万传辉,等.松潘—甘孜南部放马坪—三岩龙花岗岩的成因及其构造意义[J].地质学报,2011,85(2):195-206.
[7]赵永久,袁超,周美夫,等.松潘—甘孜造山带早侏罗世的后造山伸展:来自川西牛心沟和四姑娘山岩体的地球化学制约[J].地球化学,2007,36(2):139-152.
[8]周家云,谭洪旗,龚大兴,等.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[J].地质论评,2014,60(2):348-362.
[9]蔡宏明,张宏飞,徐旺春,等.松潘带印支期岩石圈拆沉作用新证据:来自火山岩岩石成因的研究[J].中国科学:地球科学,2010,30(11):1518-1532.
[10]颜丹平,宋鸿林,傅昭仁,等.扬子地台西缘变质核杂岩带[M].北京:地质出版社,1997:1-94.
[11]颜丹平,周美夫,宋鸿林,等.华南在Rodinia古陆中位置的讨论:扬子地块西缘变质—岩浆杂岩证据及其与Seychelles地块的对比[J].地学前缘,2002,9(4):249-256.
[12]姚鹏,汪名杰,李建忠,等.里伍式富铜矿床同位素示踪及其成矿地质意义[J].地球学报,2008,29(6):691-696.
[13]代堰锫,张惠华,朱玉娣,等.扬子陆块西缘江浪穹窿及“里伍式”富铜矿床研究进展与问题[J].地球科学与环境学报,2016,38(1):66-78.
[14]傅昭仁,宋鸿林,颜丹平.扬子地台西缘江浪变质核杂岩结构及对成矿的控制[J].地质学报,1997,71(2):113-122.
[15]张惠华,冯孝良,唐高林,等.四川省九龙县中咀铜矿构造与成矿关系研究[J].高校地质学报,2013,19(1):95-108.
[16]陈敏华,丁俊,陈道前.四川省九龙县里伍铜田成矿物质来源探讨[J].沉积与特提斯地质,2011,31(1):89-93.
[17]周家云,谭洪旗,龚大兴,等.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[J].矿物岩石,2013,33(4):42-52.
[18]NIE S,YIN A,ROWLEY D B,et al.Exhumation of the Dabie Shan ultra-high-pressure rocks and accumulation of the SongpanGanzi flysch sequence,central China[J].Geology,1994,22:999-1002.
[19]苏本勋,陈岳龙,刘飞,等.松潘—甘孜地块三叠系砂岩的地球化学特征及其意义[J].岩石学报,2006,22(4):961
[20]ZHANG H F,PARRISH R,ZHANG L,et al.A-type granite and adakitic magmatism association in Songpan-Garze fold belt,eastern Tibetan Plateau:Implication for lithospheric delamination[J].Lithos,2007,97:323-335.
[21]ZHANG H F,ZHANG L,HARRIS N,et al.U-Pb zircon ages,geochemical and isotopic compositions of granitoids in SongpanGarzêFold Belt,eastern Tibet Plateau:Constraints on petrogenesis,nature of basement and tectonic evolution[J].Contributions to Mineralogy and Petrology,2006,152:75-88.
[22]时章亮,张宏飞,蔡宏明.松潘造山带马尔康强过铝质花岗岩的成因及其构造意义[J].地球科学:中国地质大学学报,2009,34:569-584.
[23]四川省地质矿产局.四川省区域地质志[M].北京:地质出版社,1990:1-680.
[24]YAN D P,ZHOU M F,SONG H L,et al.Structural style and tectonic significance of the Jianglang dome in the eastern margin of the Tibetan Plateau,China[J].Journal of Structural Geology,2003,25(5):765-779.
[25]LIU Y S,GAO S,HU Z C,et al.Continental and oceanic crust recycling-induced 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,2010,51:537-571.
[26]YUAN H L,GAO S,DAI M N,et al.Simultaneous determinations of U-Pb age,Hf isotopes and trace element compositions of zircon by excimer laser-ablation quadrupole and multiple-collector ICP-MS[J].Chemical Geology,2008,247:100-118.
[27]MIDDLEMOST E A K.Naming materials in the magma/igneous rock system[J].Earth-Science Reviews,1994,37:215-224.
[28]PECCERILLO A,TAYLOR S R.Geochemistry of Eocene calcalkaline volcanic rocks from the Kastamonu area,Northern Turkey[J].Contributions to Mineralogy and Petrology,1976,58:63-81.
[29]TAYLOR S R,MCLENNAN S M.The Continental Crust:Its Composition and Evolution[M].Oxford:Blackwell,1985:1-328.
[30]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes[J].Geological Society of London Special Publications,1989,42:313-345.
[31]李同柱,冯孝良,张惠华,等.四川里伍铜矿含矿岩系地球化学特征及成因分析[J].地质与勘探,2010,46(5):921-930.
[32]HOSKIN P W O,SCHALTEGGER U.The composition of zircon and igneous and metamorphic petrogenesis[J].Reviews in Mineralogy and Geochemistry,2003,53:27-62.
[33]WARREN I,SIMMONS S F,MAUK J L.Whole-rock geochemical techniques for evaluating hydrothermal alteration,mass changes,and compositional gradients associated with epithermal AuAg mineralization[J].Economic Geology,2007,102:923
[34]GILL R.Igneous Rocks and Processes:A Practical Guide[M].Chichester:Wiley-Blackwell,2010:1-472.
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