西昆仑卡拉吉拉花岗岩体年代学、岩石地球化学特征及地质意义
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摘要
为确定西昆仑卡拉吉拉花岗岩体的成因及构造背景,对其进行了LA-ICP-MS锆石U-Pb测年及岩石地球化学研究。结果表明,岩体的~(206)Pb/~(238)U加权平均年龄为(223.2±2)Ma(MSWD=0.19),属于晚三叠世早期的岩浆活动产物;岩体具有较高的SiO_2含量和碱度率,低Al_2O_3、Fe_2O_3、MgO、P_2O_5,稀土元素总量较低,轻、重稀土元素分馏明显,富集Rb、Th、Zr、Hf等元素,强烈亏损Ba、Sr、P和Ti元素,相对亏损Nb和Ta元素,为高钾偏铝质钙碱系列A型花岗岩。结合区域地质资料认为,该岩体形成于后碰撞伸展环境,标志着西昆仑造山带在晚三叠世早期造山作用结束,为向板内伸展的环境过渡。
The Kalajila pluton intruded the Carboniferous Talong Group and the Sangzhutage Group of the Jixian system in the West Kunlun district. Geochronology and petrogeochemistry are used to constrain the petrogensis and tectonic setting. LA-ICP-MS zircon U-Pb dating results indicate that the pluton was formed in early Late Triassic(223.2±2) Ma. The granite is characterized by high SiO_2 and alkali, low Al_2O_3, Fe_2O_3, MgO, P_2O_5 and ∑REE. It has high LREE/HREE ratios and is enriched in Rb, Th, Zr and Hf and significantly depleted in Ba, Sr, P, Ti, slightly depleted in Nb and Ta, belonging to high-K calc-alkaline series A-type granite. Combining with regional geology, the granite was likely to be formed in post-collision environment, which recorded the transition from compressional to extensional setting of the West Kunlun orogeny in early Late Triassic.
The Kalajila pluton intruded the Carboniferous Talong Group and the Sangzhutage Group of the Jixian system in the West Kunlun district. Geochronology and petrogeochemistry are used to constrain the petrogensis and tectonic setting. LA-ICP-MS zircon U-Pb dating results indicate that the pluton was formed in early Late Triassic(223.2±2) Ma. The granite is characterized by high SiO_2 and alkali, low Al_2O_3, Fe_2O_3, MgO, P_2O_5 and ∑REE. It has high LREE/HREE ratios and is enriched in Rb, Th, Zr and Hf and significantly depleted in Ba, Sr, P, Ti, slightly depleted in Nb and Ta, belonging to high-K calc-alkaline series A-type granite. Combining with regional geology, the granite was likely to be formed in post-collision environment, which recorded the transition from compressional to extensional setting of the West Kunlun orogeny in early Late Triassic.
引文
Belousova E, Griffin W, O'Reilly S Y, Fisher N. 2002. Igneous zircon: Trace element composition as an indicator of source rock type. Contributions to Mineralogy and Petrology, 143(5): 602-622
Eby G N. 1992. Chemical subdivision of the A-type granitoids: Petrogenetic and tectonic implications. Geology, 20(7): 641-644
Hoskin P W O, Ireland T R. 2000. Rare earth element chemistry of zircon and its use as a provenance indicator. Geology, 28(7): 627-630
Jackson S E, Pearson N J, Griffin W L, Belousova E A. 2004. The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology. Chemical Geology, 211(1-2): 47-69
Jiang Y H, Jia R Y, Liu Z, Liao S Y, Zhao P, Zhou Q. 2013. Origin of Middle Triassic high-K calc-alkaline granitoids and their potassic microgranular enclaves from the Western Kunlun orogen, northwest China: A record of the closure of Paleo-Tethys. Lithos, 156-159: 13-30
Le Maitre R W, Streckeisen A, Zanettin B, Le Bas M J, Bonin B, Bateman P. 2005. Igneous Rocks: A classification and glossary of terms: Recommendations of the international union of geological sciences subcommission on the systematics of Igneous Rocks. 2nd ed. UK: Cambridge University Press, 236
Ludwig K R. 1998. ISOPLOT/EX-a geochronological tool kit for Microsoft excel. Berkeley CA: Geochronology Center, 4: 1-53
Maniar P D, Piccoli P M. 1989. Tectonic discrimination of granitoids. Geological Society of America Bulletin, 101(5): 635-643
Patino Douce, A E. 2005. Vapor-Absent Melting of Tonalite at 15-32 kbar. Journal of Petrology, 46(2):275-290
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.
Peccerillo A, Taylor S R. 1976. Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contributions to Mineralogy and Petrology, 58(1): 63-81
Rapp R P, Watson E B, Miller C F. 1991. Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites. Precambrian Research, 51(1-4): 1-25
Roberts M P, Clemens J D. 1993. Origin of high-potassium, calc-alkaline, I-type granitoids. Geology, 21(9): 825-828
Rubatto D. 2002. Zircon trace element geochemistry: Partitioning with garnet and the link between U-Pb ages and metamorphism. Chemical Geology, 184(1-2): 123-138
Sun S S, McDonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geological Society, London, Special Publications, 42(1): 313-345
Whalen J B, Currie K L, Chappell B W. 1987. A-type granites: Geochemical characteristics, discrimination and petrogenesis. Contributions to Mineralogy and Petrology, 95(4): 407-419
Williams I S, Buick I S, Cartwright I. 1996. An extended episode of early Mesoproterozoic metamorphic fluid flow in the Reynolds Range, central Australia. Journal of Metamorphic Geology, 14(1): 29-47
Xiao W J, Windley B F, Fang A M, Zhou H, Yuan C, Wang Z H, Hao J, Hou Q L, Li J L. 2001. Palaeozoic-Early Mesozoic Accretionary Tectonics of the Western Kunlun Range, NW China. Gondwana Research, 4(4): 826-827
曹烨, 李胜荣, 李真真, 刘小滨, 敖翀. 2009. 太行山北段石湖金矿区中生代岩浆岩中单颗粒锆石的稀土元素特征及启示. 中国稀土学报, 27(4): 564-573
陈海云, 孙妍, 包平, 白俊, 孙晓东. 2014. 西昆仑上其木干岩体岩石成因及地质意义: 地球化学及U-Pb年代学证据. 岩石矿物学杂志, 33(4): 657-670
高晓峰, 校培喜, 康磊, 奚仁刚, 过磊, 谢从瑞, 杨再朝. 2013. 西昆仑大同西岩体成因: 矿物学、地球化学和锆石U-Pb年代学制约. 岩石学报, 29(9): 3065-3079
河南省地质调查院.2005. 新疆1:25万英吉沙县幅区域地质调查报告
姜春发, 王宗起, 李锦轶. 2000. 中央造山带开合构造. 北京: 地质出版社, 7-13
姜耀辉, 芮行健, 郭坤一, 贺菊瑞. 2000. 西昆仑造山带花岗岩形成的构造环境. 地球学报, 21(1): 23-25
康磊, 校培喜, 高晓峰, 奚仁刚, 过磊, 董增产. 2012a. 西昆仑慕士塔格岩体的岩石地球化学特征、岩石成因及其构造意义. 地质通报, 31(12): 2001-2014
康磊, 校培喜, 高晓峰, 董增产,过磊,奚仁刚. 2012b. 西昆仑慕士塔格岩体的LA-ICP-MS锆石U-Pb定年: 对古特提斯碰撞时限的制约. 地质论评, 58(4): 763-774
匡文龙, 高珍权, 印建平, 朱自强, 刘石华. 2002. 西昆仑地区塔木MVT型铅锌矿床成矿作用和成矿物质来源探讨. 矿物岩石地球化学通报, 21(4): 253-257
李荣社, 计文化, 杨永成, 于浦生, 赵振明, 陈守建. 2008. 昆仑山及邻区地质. 北京: 地质出版社, 384-388
李献华, 周汉文, 刘颖, 李寄嵎, 陈正宏, 于津生, 桂训唐. 2000. 粤西阳春中生代钾玄质侵入岩及其构造意义: Ⅰ. 岩石学和同位素地质年代学. 地球化学, 29(6): 513-520
柳政甫, 李秋根, 王宗起, 汤好书, 陈衍景, 朱杰, 肖兵. 2017. 西昆仑慕士塔格岩体锆石U-Pb和黑云母40Ar-39Ar年龄及其地质意义. 地球科学与环境学报, 39(3): 344-356
沈能平, 张正伟, 彭建堂, 肖加飞, 朱笑青, 游富华, 张中山, 王富东. 2010. 西昆仑阿巴列克地区地层样品稀土元素地球化学特征. 矿物岩石地球化学通报, 29(4): 388-399
汪玉会, 冷成彪, 张兴春. 2013. 新疆叶城县库喀阿孜铅-锌-(铜-钨)多金属矿区中-酸性侵入岩元素地球化学和年代学初步研究. 矿物岩石地球化学通报, 32(6): 736-745
汪玉珍, 方锡廉. 1987. 西昆仑山、喀喇昆仑山花岗岩类时空分布规律的初步探讨. 新疆地质, 5(1): 9-24
许志琴, 李思田, 张建新, 杨经绥, 何碧竹, 李海兵, 林畅松, 蔡志慧. 2011. 塔里木地块与古亚洲/特提斯构造体系的对接. 岩石学报, 27(1): 1-22
袁超, 孙敏, 周辉, 肖文交, 侯泉林, 李继亮. 2003. 西昆仑阿卡阿孜山岩体的年代、源区和构造意义. 新疆地质, 21(1): 37-45
袁洪林, 吴福元, 高山, 柳小明, 徐平, 孙德有. 2003. 东北地区新生代侵入体的锆石激光探针U-Pb年龄测定与稀土元素成分分析. 科学通报, 48(14): 1511-1520
张传林, 于海峰, 王爱国, 郭坤一. 2005. 西昆仑西段三叠纪两类花岗岩年龄测定及其构造意义. 地质学报, 79(5): 645-652
Eby G N. 1992. Chemical subdivision of the A-type granitoids: Petrogenetic and tectonic implications. Geology, 20(7): 641-644
Hoskin P W O, Ireland T R. 2000. Rare earth element chemistry of zircon and its use as a provenance indicator. Geology, 28(7): 627-630
Jackson S E, Pearson N J, Griffin W L, Belousova E A. 2004. The application of laser ablation-inductively coupled plasma-mass spectrometry to in situ U-Pb zircon geochronology. Chemical Geology, 211(1-2): 47-69
Jiang Y H, Jia R Y, Liu Z, Liao S Y, Zhao P, Zhou Q. 2013. Origin of Middle Triassic high-K calc-alkaline granitoids and their potassic microgranular enclaves from the Western Kunlun orogen, northwest China: A record of the closure of Paleo-Tethys. Lithos, 156-159: 13-30
Le Maitre R W, Streckeisen A, Zanettin B, Le Bas M J, Bonin B, Bateman P. 2005. Igneous Rocks: A classification and glossary of terms: Recommendations of the international union of geological sciences subcommission on the systematics of Igneous Rocks. 2nd ed. UK: Cambridge University Press, 236
Ludwig K R. 1998. ISOPLOT/EX-a geochronological tool kit for Microsoft excel. Berkeley CA: Geochronology Center, 4: 1-53
Maniar P D, Piccoli P M. 1989. Tectonic discrimination of granitoids. Geological Society of America Bulletin, 101(5): 635-643
Patino Douce, A E. 2005. Vapor-Absent Melting of Tonalite at 15-32 kbar. Journal of Petrology, 46(2):275-290
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.
Peccerillo A, Taylor S R. 1976. Geochemistry of eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contributions to Mineralogy and Petrology, 58(1): 63-81
Rapp R P, Watson E B, Miller C F. 1991. Partial melting of amphibolite/eclogite and the origin of Archean trondhjemites and tonalites. Precambrian Research, 51(1-4): 1-25
Roberts M P, Clemens J D. 1993. Origin of high-potassium, calc-alkaline, I-type granitoids. Geology, 21(9): 825-828
Rubatto D. 2002. Zircon trace element geochemistry: Partitioning with garnet and the link between U-Pb ages and metamorphism. Chemical Geology, 184(1-2): 123-138
Sun S S, McDonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. Geological Society, London, Special Publications, 42(1): 313-345
Whalen J B, Currie K L, Chappell B W. 1987. A-type granites: Geochemical characteristics, discrimination and petrogenesis. Contributions to Mineralogy and Petrology, 95(4): 407-419
Williams I S, Buick I S, Cartwright I. 1996. An extended episode of early Mesoproterozoic metamorphic fluid flow in the Reynolds Range, central Australia. Journal of Metamorphic Geology, 14(1): 29-47
Xiao W J, Windley B F, Fang A M, Zhou H, Yuan C, Wang Z H, Hao J, Hou Q L, Li J L. 2001. Palaeozoic-Early Mesozoic Accretionary Tectonics of the Western Kunlun Range, NW China. Gondwana Research, 4(4): 826-827
曹烨, 李胜荣, 李真真, 刘小滨, 敖翀. 2009. 太行山北段石湖金矿区中生代岩浆岩中单颗粒锆石的稀土元素特征及启示. 中国稀土学报, 27(4): 564-573
陈海云, 孙妍, 包平, 白俊, 孙晓东. 2014. 西昆仑上其木干岩体岩石成因及地质意义: 地球化学及U-Pb年代学证据. 岩石矿物学杂志, 33(4): 657-670
高晓峰, 校培喜, 康磊, 奚仁刚, 过磊, 谢从瑞, 杨再朝. 2013. 西昆仑大同西岩体成因: 矿物学、地球化学和锆石U-Pb年代学制约. 岩石学报, 29(9): 3065-3079
河南省地质调查院.2005. 新疆1:25万英吉沙县幅区域地质调查报告
姜春发, 王宗起, 李锦轶. 2000. 中央造山带开合构造. 北京: 地质出版社, 7-13
姜耀辉, 芮行健, 郭坤一, 贺菊瑞. 2000. 西昆仑造山带花岗岩形成的构造环境. 地球学报, 21(1): 23-25
康磊, 校培喜, 高晓峰, 奚仁刚, 过磊, 董增产. 2012a. 西昆仑慕士塔格岩体的岩石地球化学特征、岩石成因及其构造意义. 地质通报, 31(12): 2001-2014
康磊, 校培喜, 高晓峰, 董增产,过磊,奚仁刚. 2012b. 西昆仑慕士塔格岩体的LA-ICP-MS锆石U-Pb定年: 对古特提斯碰撞时限的制约. 地质论评, 58(4): 763-774
匡文龙, 高珍权, 印建平, 朱自强, 刘石华. 2002. 西昆仑地区塔木MVT型铅锌矿床成矿作用和成矿物质来源探讨. 矿物岩石地球化学通报, 21(4): 253-257
李荣社, 计文化, 杨永成, 于浦生, 赵振明, 陈守建. 2008. 昆仑山及邻区地质. 北京: 地质出版社, 384-388
李献华, 周汉文, 刘颖, 李寄嵎, 陈正宏, 于津生, 桂训唐. 2000. 粤西阳春中生代钾玄质侵入岩及其构造意义: Ⅰ. 岩石学和同位素地质年代学. 地球化学, 29(6): 513-520
柳政甫, 李秋根, 王宗起, 汤好书, 陈衍景, 朱杰, 肖兵. 2017. 西昆仑慕士塔格岩体锆石U-Pb和黑云母40Ar-39Ar年龄及其地质意义. 地球科学与环境学报, 39(3): 344-356
沈能平, 张正伟, 彭建堂, 肖加飞, 朱笑青, 游富华, 张中山, 王富东. 2010. 西昆仑阿巴列克地区地层样品稀土元素地球化学特征. 矿物岩石地球化学通报, 29(4): 388-399
汪玉会, 冷成彪, 张兴春. 2013. 新疆叶城县库喀阿孜铅-锌-(铜-钨)多金属矿区中-酸性侵入岩元素地球化学和年代学初步研究. 矿物岩石地球化学通报, 32(6): 736-745
汪玉珍, 方锡廉. 1987. 西昆仑山、喀喇昆仑山花岗岩类时空分布规律的初步探讨. 新疆地质, 5(1): 9-24
许志琴, 李思田, 张建新, 杨经绥, 何碧竹, 李海兵, 林畅松, 蔡志慧. 2011. 塔里木地块与古亚洲/特提斯构造体系的对接. 岩石学报, 27(1): 1-22
袁超, 孙敏, 周辉, 肖文交, 侯泉林, 李继亮. 2003. 西昆仑阿卡阿孜山岩体的年代、源区和构造意义. 新疆地质, 21(1): 37-45
袁洪林, 吴福元, 高山, 柳小明, 徐平, 孙德有. 2003. 东北地区新生代侵入体的锆石激光探针U-Pb年龄测定与稀土元素成分分析. 科学通报, 48(14): 1511-1520
张传林, 于海峰, 王爱国, 郭坤一. 2005. 西昆仑西段三叠纪两类花岗岩年龄测定及其构造意义. 地质学报, 79(5): 645-652