广西岑溪地区糯垌岩体中岩石包体的岩石学、地球化学特征及其意义
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摘要
为探讨广西岑溪地区糯垌岩体及其岩石包体的成因,对糯垌岩体的岩石包体进行详细的岩相学、LA—ICP—MS锆石U—Pb年代学和地球化学分析。岩相学研究表明糯垌岩体的岩石包体主要为斑状黑云母钾长花岗岩、黑云斜长片麻岩、黑云二长片麻岩、二长变粒岩、钾长变粒岩和花岗闪长岩,按成因分为捕掳体和残浆包体两类。斑状黑云母钾长花岗岩包体(样品F16—7—6)和黑云斜长片麻岩包体(样品F16—13—4)的LA—ICP—MS锆石U—Pb定年结果分别为(152. 3±2. 2) Ma和(252. 7±4. 4)Ma;斑状黑云母钾长花岗岩与寄主岩石形成时代一致,黑云斜长片麻岩与大冲花岗闪长岩的侵位时代一致。岩石包体和寄主岩石在hark图解、稀土元素配分曲线和微量元素蛛网图中具有相似的演化趋势,表明寄主岩石经历了一定程度的同化混染作用。
The petrography,LA—ICP—MS zircon U—Pb chronology and geochemical analysis of inclusions in Nuodong pluton are studied to explore the genesis of Nuodong pluton and its inclusions in the Cenxi area of Guangxi Province. The results of petrographic study show that the rock inclusions of Nuodong pluton are mainly composed of porphyritic biotite feldspar granites,biotite plagiogneiss,biotite monzognesiss,fine-grained monzognesiss,k-feldspar granulite and granodiorite. The inclusions can be divided into xenolith and residual magma inclusions according to the petrogenesis. The zircon U—Pb dating results of the porphyritic biotite feldspar granites inclusions( Sample F16—7—6) and biotite plagiogneiss inclusions( Samples F16—13—4) by LA—ICP—MS are 152. 3 ± 2. 2 Ma and 252. 7 ± 4. 4 Ma,respectively. The age of porphyritic biotite feldspar granite is consistent with that of the host rocks,and the age of biotite plagiogneiss is consistent with the emplacement age of Dachong granodiorite pluton.The inclusions and the host rocks have similar evolutionary trend in the hark diagram,the REE distribution curves and spider diagram,indicating that the host rocks had undergone some degrees of assimilation and mixing.
The petrography,LA—ICP—MS zircon U—Pb chronology and geochemical analysis of inclusions in Nuodong pluton are studied to explore the genesis of Nuodong pluton and its inclusions in the Cenxi area of Guangxi Province. The results of petrographic study show that the rock inclusions of Nuodong pluton are mainly composed of porphyritic biotite feldspar granites,biotite plagiogneiss,biotite monzognesiss,fine-grained monzognesiss,k-feldspar granulite and granodiorite. The inclusions can be divided into xenolith and residual magma inclusions according to the petrogenesis. The zircon U—Pb dating results of the porphyritic biotite feldspar granites inclusions( Sample F16—7—6) and biotite plagiogneiss inclusions( Samples F16—13—4) by LA—ICP—MS are 152. 3 ± 2. 2 Ma and 252. 7 ± 4. 4 Ma,respectively. The age of porphyritic biotite feldspar granite is consistent with that of the host rocks,and the age of biotite plagiogneiss is consistent with the emplacement age of Dachong granodiorite pluton.The inclusions and the host rocks have similar evolutionary trend in the hark diagram,the REE distribution curves and spider diagram,indicating that the host rocks had undergone some degrees of assimilation and mixing.
引文
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[7]王朝阳,孟恩,李壮,等.吉林东南部古元古代中-晚期富钾花岗质岩石的时代、成因及其对区域构造演化的制约[J].世界地质,2017,36(4):1031-1052.WANG Chao-yang,MENG En,LI Zhuang,et al.Age and petrogenesis of Middle-Late Paleoproterozoic potassium-rich granitic rocks in southeastern Jilin and their constraints on regional tectonic evolution[J].Global Geology,2017,36(4):1031-1052.
[8]商宇航,王键,李洪光,等.黑龙江东部海音山花岗闪长岩年龄、岩石成因及构造背景[J].世界地质,2017,36(4):1053-1064.SHANG Yu-hang,WANG Jian,LI Hong-guang,et al.Age,petrogenesis and tectonic implication of granodiorites in Haiyinshan area,eastern Heilongjiang[J].Global Geology,2017,36(4):1053-1064.
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[13]Li X H.Cretaceous magmatism and lithospheric extension in Southeast China[J].Journal of Asian Earth Sciences,2000,18:293-305.
[14]Li Z X,Li X H.Formation of the 1300 km-wide intracontinental orogen and post-orogenic magmatic province in Mesozoic South China:a flat-slab subduction model[J].Geology,2007,35,179-182.
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[16]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用(Ⅰ):来自糯垌蛇绿岩的新证据[J].地球科学,2016,41(5):765-778.PENG Song-bai,LIU Song-feng,LIN Mu-sen,et al.Early Paleozoic subduction in cathaysia(Ⅰ):new evidence from Nuodong ophiolite[J].Earth Science,2016,41(5):765-778.
[17]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用(Ⅱ):大爽高镁-镁质安山岩新证据[J].地球科学,2016,41(6):931-947.PENG Song-bai,LIU Song-feng,LIN Mu-sen,et al.Early Paleozoic subduction in cathaysia(Ⅱ):new evidence from the Dashuang high magnesian-magnesian andesite[J].Earth Science,2016,41(6):931-947.
[18]覃小锋,王宗起,宫江华,等.云开地块北缘加里东期中-基性火山岩的厘定:钦-杭结合带南西段早古生代古洋盆存在的证据[J].岩石学报,2017,33(3):791-809.QIN Xiao-feng,WANG Zong-qi,GONG Jiang-hua,et al.The confirmation of caledonian intermediate-mafic volcanic rocks in northern margin of Yunkai block:evidence for Early Paleozoic paleo-ocean basin in southwestern segment of Qinzhou-Hangzhou joint belt[J].Acta Petrologica Sinica,2017,33(3):791-809.
[19]程顺波,付建明,马丽艳,等.广西佛子冲矿田大冲花岗闪长岩锆石SHRIMP U-Pb定年及其地质意义[J].华南地质与矿产,2012,28(4):315-320.CHENG Shun-bo,FU Jian-ming,MA Li-yan,et al.Zircon SHRIMP U-Pb dating of Dachong granodioritic stock and its geological significance in Fozichong deposit,Guangxi Province[J].Geology and Mineral Resources of South China,2012,28(4):315-320.
[20]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(1):537-571.
[21]李程,杨启军,秦亚.广西岑溪地区糯垌A型花岗岩的厘定及其构造意义[J].地质与勘探,2017,53(6):1090-1104.LI Cheng,YANG Qi-jun,QIN Ya.Confirmation of the Nuodong A-type granite in Cenxi City of Guangxi and its tectonic significance[J].Geology and Exploration,2017,53(6):1090-1104.
[22]Eby G N.The a-type granitoids:a review of their occurrence and chemical characteristics and speculations on their petrogenesis[J].Lithos,1990,26:115-134.
[23]Eby G N.Chemical subdivision of the A-type granitoids:petrogenetic and tectonic implications[J].Geology,1992,20:641.
[24]Turner S P,Foden J D,Morrison R S.Derivation of some S-type magmas by fractionation of basaltic magma:an example from the padthaway ridge,South Australia[J].Lithos,1992,28:151-179.
[25]邱检生,王德滋,彭亚鸣,等.浙江舟山桃花岛碱性花岗岩的岩石学和地球化学特征及成因探讨[J].南京大学学报(自然科学版),1996,32(1):82-91.QIU Jian-sheng,WANG De-zi,PENG Ya-ming,et al.Petrology,geochemistry and genesis of Taohuadao alkali granite in Zhoushan,Zhejiang Province[J].Journal of Nanjing University(Natural Sciences),1996,32(1):82-91.
[26]李艳军,魏俊浩,陈华勇,等.义敦岛弧带夏塞早白垩世A型花岗岩成因:锆石U--Pb年代学、地球化学及Hf同位素制约[J].大地构造与成矿学,2014,38(4):939-953.LI Yan-jun,WEI Jun-hao,CHEN Hua-yong,et al.Petrogenesis of the Xiasai Early Creataceous A-type granite from the Yidun island arc belt,SW China:constraints from zircon U--Pb age,geochemistry and Hf isotope[J].Geotectonica et Metallogenia,2014,38(4):939-953.
[27]Collins W J,Beams S D,White A J R,et al.Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy and Petrology,1982,80:189-200.
[28]Whalen J B,Currie K L,Chappell B W.A-type granites:geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy and Petrology,1987,95:407-419.
[29]李献华,李武显,李正祥.再论南岭燕山早期花岗岩的成因类型与构造意义[J].科学通报,2007,62(9):981-991.LI Xian-hua,LI Wu-xian,LI Zheng-xiang.On the genetic classification and tectonic implications of the early Yanshanian granitoids in Nanling range,South China[J].Chinese Science Bulletin,2007,62(9):981-991.
[30]Li X H,Li Z X,Li W X,et al.U--Pb zircon,geochemical and Sr--Nd--Hf isotopic constraints on age and origin of Jurassic I and A-type granites from central Guangdong,SE China:a major igneous event in respond to foundering of a subducted flat-slab?[J].Lithos,2007,29:186-204.
[2]李昌年.岩浆混合作用及其研究评述[J].地质科技情报,2002,21(4):49-54.LI Chang-nian.Comment on the magma mixing and their research[J].Geological Science and Technology Information,2002,21(4):49-54.
[3]齐有强,胡瑞忠,刘燊,等.岩浆混合作用研究综述[J].矿物岩石地球化学通报,2008,27(4):409-416.QI You-qiang,HU Rui-zhong,LIU Shen,et al.Review on magma mixing and mingling[J].Bulletin of Mineralogy,Petrology and Geochemistry,2008,27(4):409-416.
[4]王德滋,谢磊.岩浆混合作用:来自岩石包体的证据[J].高校地质学报,2008,14(3):16-21.WANG De-zi,XIE Lei.Magma mingling:evidence from inclusions[J].Geological Journal of China Universities,2008,14(3):16-21.
[5]彭卓伦,Rodney Grapes,庄文明,等.华南花岗岩暗色微粒包体矿物组成及微结构研究[J].地学前缘,2011,18(1):63-73.PENG Zhuo-lun,Grapes R,ZHUANG Wen-ming,et al.A study of mineral composition and microtexture of the mafic microgranular inclusion in granites in SE China[J].Earth Science Frontiers,2011,18(1):63-73.
[6]马延景,杨延乾,张小永,等.青海泽多桌肉地区花岗闪长岩与暗色包体地球化学特征及成因[J].地质找矿论丛,2017,32(2):254-265.MA Yan-jing,YANG Yan-qian,ZHANG Xiao-yong,et al.Geochemistry and genesis of granodiorite and the dark inclusion in Zeduozhuorou area,Qinghai[J].Contributions to Geology and Mineral Resources Research,2017,32(2):254-265.
[7]王朝阳,孟恩,李壮,等.吉林东南部古元古代中-晚期富钾花岗质岩石的时代、成因及其对区域构造演化的制约[J].世界地质,2017,36(4):1031-1052.WANG Chao-yang,MENG En,LI Zhuang,et al.Age and petrogenesis of Middle-Late Paleoproterozoic potassium-rich granitic rocks in southeastern Jilin and their constraints on regional tectonic evolution[J].Global Geology,2017,36(4):1031-1052.
[8]商宇航,王键,李洪光,等.黑龙江东部海音山花岗闪长岩年龄、岩石成因及构造背景[J].世界地质,2017,36(4):1053-1064.SHANG Yu-hang,WANG Jian,LI Hong-guang,et al.Age,petrogenesis and tectonic implication of granodiorites in Haiyinshan area,eastern Heilongjiang[J].Global Geology,2017,36(4):1053-1064.
[9]Holloway N H.North Palawan block,philippines-its relation to Asian mainland and role in evolution of South China Sea[J].American Association of Petroleum Geologists Bulletin,1982,66:1355-1383.
[10]Hsu K J,Sun S,Li J L,et al.Mesozoic overthrust tectonics in south China[J].Geology,1988,16:418-421.
[11]Gilder S A,Keller G R,Luo M,et al.Timing and spatial distribution of rifting in China[J].Tectonophysices,1991,197:225-243.
[12]Gilder S A,Gill J,Goe R S,et al.Isotopic and paleomagnetic constraints on the Mesozoic tectonic evolution of South China[J].Journal of Geophysical Research,1996,101(B7):137-154.
[13]Li X H.Cretaceous magmatism and lithospheric extension in Southeast China[J].Journal of Asian Earth Sciences,2000,18:293-305.
[14]Li Z X,Li X H.Formation of the 1300 km-wide intracontinental orogen and post-orogenic magmatic province in Mesozoic South China:a flat-slab subduction model[J].Geology,2007,35,179-182.
[15]广西壮族自治区地质矿产局.广西壮族自治区区域地质志[M].北京:地质出版社,1985:1-853.Bureau of Geology and Mineral Resources of Guangxi Zhuang Autonomous Region.Regional geology of Guangxi zhuang Autonomous Region[M].Beijing:Geological Publishing House,1985:1-853.
[16]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用(Ⅰ):来自糯垌蛇绿岩的新证据[J].地球科学,2016,41(5):765-778.PENG Song-bai,LIU Song-feng,LIN Mu-sen,et al.Early Paleozoic subduction in cathaysia(Ⅰ):new evidence from Nuodong ophiolite[J].Earth Science,2016,41(5):765-778.
[17]彭松柏,刘松峰,林木森,等.华夏古生代俯冲作用(Ⅱ):大爽高镁-镁质安山岩新证据[J].地球科学,2016,41(6):931-947.PENG Song-bai,LIU Song-feng,LIN Mu-sen,et al.Early Paleozoic subduction in cathaysia(Ⅱ):new evidence from the Dashuang high magnesian-magnesian andesite[J].Earth Science,2016,41(6):931-947.
[18]覃小锋,王宗起,宫江华,等.云开地块北缘加里东期中-基性火山岩的厘定:钦-杭结合带南西段早古生代古洋盆存在的证据[J].岩石学报,2017,33(3):791-809.QIN Xiao-feng,WANG Zong-qi,GONG Jiang-hua,et al.The confirmation of caledonian intermediate-mafic volcanic rocks in northern margin of Yunkai block:evidence for Early Paleozoic paleo-ocean basin in southwestern segment of Qinzhou-Hangzhou joint belt[J].Acta Petrologica Sinica,2017,33(3):791-809.
[19]程顺波,付建明,马丽艳,等.广西佛子冲矿田大冲花岗闪长岩锆石SHRIMP U-Pb定年及其地质意义[J].华南地质与矿产,2012,28(4):315-320.CHENG Shun-bo,FU Jian-ming,MA Li-yan,et al.Zircon SHRIMP U-Pb dating of Dachong granodioritic stock and its geological significance in Fozichong deposit,Guangxi Province[J].Geology and Mineral Resources of South China,2012,28(4):315-320.
[20]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(1):537-571.
[21]李程,杨启军,秦亚.广西岑溪地区糯垌A型花岗岩的厘定及其构造意义[J].地质与勘探,2017,53(6):1090-1104.LI Cheng,YANG Qi-jun,QIN Ya.Confirmation of the Nuodong A-type granite in Cenxi City of Guangxi and its tectonic significance[J].Geology and Exploration,2017,53(6):1090-1104.
[22]Eby G N.The a-type granitoids:a review of their occurrence and chemical characteristics and speculations on their petrogenesis[J].Lithos,1990,26:115-134.
[23]Eby G N.Chemical subdivision of the A-type granitoids:petrogenetic and tectonic implications[J].Geology,1992,20:641.
[24]Turner S P,Foden J D,Morrison R S.Derivation of some S-type magmas by fractionation of basaltic magma:an example from the padthaway ridge,South Australia[J].Lithos,1992,28:151-179.
[25]邱检生,王德滋,彭亚鸣,等.浙江舟山桃花岛碱性花岗岩的岩石学和地球化学特征及成因探讨[J].南京大学学报(自然科学版),1996,32(1):82-91.QIU Jian-sheng,WANG De-zi,PENG Ya-ming,et al.Petrology,geochemistry and genesis of Taohuadao alkali granite in Zhoushan,Zhejiang Province[J].Journal of Nanjing University(Natural Sciences),1996,32(1):82-91.
[26]李艳军,魏俊浩,陈华勇,等.义敦岛弧带夏塞早白垩世A型花岗岩成因:锆石U--Pb年代学、地球化学及Hf同位素制约[J].大地构造与成矿学,2014,38(4):939-953.LI Yan-jun,WEI Jun-hao,CHEN Hua-yong,et al.Petrogenesis of the Xiasai Early Creataceous A-type granite from the Yidun island arc belt,SW China:constraints from zircon U--Pb age,geochemistry and Hf isotope[J].Geotectonica et Metallogenia,2014,38(4):939-953.
[27]Collins W J,Beams S D,White A J R,et al.Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy and Petrology,1982,80:189-200.
[28]Whalen J B,Currie K L,Chappell B W.A-type granites:geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy and Petrology,1987,95:407-419.
[29]李献华,李武显,李正祥.再论南岭燕山早期花岗岩的成因类型与构造意义[J].科学通报,2007,62(9):981-991.LI Xian-hua,LI Wu-xian,LI Zheng-xiang.On the genetic classification and tectonic implications of the early Yanshanian granitoids in Nanling range,South China[J].Chinese Science Bulletin,2007,62(9):981-991.
[30]Li X H,Li Z X,Li W X,et al.U--Pb zircon,geochemical and Sr--Nd--Hf isotopic constraints on age and origin of Jurassic I and A-type granites from central Guangdong,SE China:a major igneous event in respond to foundering of a subducted flat-slab?[J].Lithos,2007,29:186-204.