桂北四堡群火山岩锆石SHRIMP年龄及其地层学意义
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摘要
四堡群为一套出露于桂北黔东南地区、变形强烈的浅变质、陆源碎屑岩火山岩、系,厚度大于5000 m,其下未见底,上被丹洲群(下江群相当地层)所覆盖。桂北四堡群自下而上划分为九小组、文通组和鱼西组3组。样品A20140731-3采自于文通组,岩性为灰绿色熔结火山岩,首次分选出600余粒岩浆型锆石,完成SHRIMP U-Pb定年测点15个,获得加权平均年龄(860±13)Ma。这表明四堡群主体属于新元古界,进而分析、讨论了江南造山带主要地层对比关系。
The Sibao Group, outcropped in the north part of Guangxi and southeast part of Guizhou, is composed of over 5000 m thick succession of strongly-deformed, low-grade metamorphic volcanic rocks and terrigenous clastic rock, overlain unconformityby the Danzhou Group(Xiajiang Group). It is divided into three Formations: Jiuxiao Formation, Wentong Formation and Yuxi Formation. Sample A20140731-3 is lava, collected from the upper part of the Wentong Formation, and over 600 grains of zircon were sorted out from it. Fifteen of the zircons were analyzed with SHRIMP, and a weighed-mean U-Pb age of(860±13)Ma was obtained, which indicates that the volcanic rocks of the Sibao Group belong to Neoproterozoic. Based on this new zircon SHRIMP U-Pb age combined with the other high-quality ages obtained recently in the Jiangnan Orogen, the authors investigated the stratigraphic correlation between Sibao Group and the other main strata, such as Lengjiaxi Group, Shuangqiaoshan Group, and Fanjingshan Group.
The Sibao Group, outcropped in the north part of Guangxi and southeast part of Guizhou, is composed of over 5000 m thick succession of strongly-deformed, low-grade metamorphic volcanic rocks and terrigenous clastic rock, overlain unconformityby the Danzhou Group(Xiajiang Group). It is divided into three Formations: Jiuxiao Formation, Wentong Formation and Yuxi Formation. Sample A20140731-3 is lava, collected from the upper part of the Wentong Formation, and over 600 grains of zircon were sorted out from it. Fifteen of the zircons were analyzed with SHRIMP, and a weighed-mean U-Pb age of(860±13)Ma was obtained, which indicates that the volcanic rocks of the Sibao Group belong to Neoproterozoic. Based on this new zircon SHRIMP U-Pb age combined with the other high-quality ages obtained recently in the Jiangnan Orogen, the authors investigated the stratigraphic correlation between Sibao Group and the other main strata, such as Lengjiaxi Group, Shuangqiaoshan Group, and Fanjingshan Group.
引文
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[7]高林志,戴传固,刘燕学,等.下江群甲路组凝灰岩锆石SHRIMPU-Pb年龄及其地层意义[J].中国地质,2010,37(4):1071-1082.Gao Linzhi,Dai Chuangu,Liu Yanxue,et al.Zircon SHRIMP UPb dating of tuff bed of the Xiajing Group and implication for its stratigraphy[J].Geology in China,2010,37(4):1071-1082(in Chinese with English abstract).
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[11]江思宏,梁清玲,聂凤军,等.内蒙古林西双井子杂岩锆石LA-MC-ICP-MS测年初步研究[J].中国地质,2014,41(4):1108-1123.Jiang Sihong,Liang Qingling,Nie Fengjun,et al.A preliminary study of zircon LA-MC-ICP-MS U-Pb ages of the Shuangjingzi complex in Linxi,Inner Mongolia[J].Geology in China,2014,41(4):1108-1123(in Chinese with English abstract).
[12]孟元库,许志琴,陈希节,等.冈底斯中段碱长花岗岩锆石UPb-Hf同位素特征及地质意义[J].中国地质,2015,(5):1202-1213.Meng Yuanku,Xu Zhiqin,Chen Xijie,et al.Isotope study of alkali-feldspar granite zircon in the middle Gangdise batholith and its geological significance[J].Geology in China,2015,(5):1202-1213(in Chinese with English abstract).
[13]Li X H,Li W X,Li Z X,et al.Amalgamation between the Yangtze and Cathaysia Blocks in South China:Constrains from SHRIMP U-Pb zircon ages,geochemistry and Nd-Hf isotopes of the Shuangxiwu volcanic rocks[J].Precambrain Reswarch,2009,174:117-128.
[14]Zhou J C,Wang W L,Qiu J S.Geochronology of Neoproterozoic mafic rocks and sandstones from northeastern Guizhou,South China:Coeval arc magmatism and sedimentation[J].Precambrain Reswarch,2009,170:27-42.
[15]Wang X L,Zhou J C,Griffin W L,et al.Detrital zircon geochronology of Precambrian basement sequences in the Jiangnan orogeny:Dating the assembly of the Yangtze and Cathysia blocks[J].Precambrian Research,2007,159:117-131.
[16]张传恒,高林志,史晓颖,等.梵净山群火山岩锆石SHRIMP年龄及其年代地层学意义[J].地学前缘.2014,21(2):139-143.Zhang Chuanheng,Gao Linzhi,Shi Xiaoying,et al.SHRIMP age of the volcanic rock from the Fanjingshan Group and its chronostratigraphic significances[J].Earth Science Frontiers,2014,21(2):139-143(in Chinese with English abstract).
[17]王敏,戴传固,王雪华,等.贵州梵净山白云母花岗岩锆石年代、铪同位素及对华南地壳生长的制约[J].地学前缘.2011,18(5):213-223.Wang Min,Dai Chuangu,Wang Xuehua,et al.In-situ zircon geochronology and Hf isotope of muscovite-bearing leucogranites from Fanjingshan,Guizhou Province,and constraints on continental growth of the Southern China block[J].Earth Science Frontiers,2011,18(5):213-223(in Chinese with English abstract).
[18]高林志,戴传固,丁孝忠,等.侵入梵净山群白岗岩锆石U-Pb年龄及白岗岩底砾岩对下江群沉积的制约[J].中国地质.2011,38(6):1111-1118.Gao Linzhi,Dai Chuangu,Ding Xiaozhong,et al.SHRIMP UPb dating of intrusive alaskite in the Fangjingshan Group and alaskite basal conglomerates:constraints on the deposition of Xiajiang Group[J].Geology in China,2011,38(6):1111-1118(in Chinese with English abstract).
[19]孟庆秀,张健,耿建珍,等.湘中地区冷家溪群和板溪群锆石U-Pb年龄、Hf同位素特征及对华南新元古代构造演化的意义[J].中国地质,2013,40(1):191-216.Meng Qingxiu,Zhang Jian,Geng Jianzhen,et al.Zircon U-Pb age and Hf isotope compositions of Lengjiaxi and Baxi groups in middle Hunan Province:Implications for the Neoproterozoic tectonic evolution in South China[J].Geology in China,2013,40(1):191-216(in Chinese with English abstract).
[20]高林志,陈峻,丁孝忠,等.湘东北岳阳地区冷家溪群及板溪群凝灰岩SHRIMP锆石U-Pb年龄——对武陵运动的制约[J].地质通报.2011,30(9):1001-1008.Gao Linzhi,Chen Jun,Ding Xiaozhong,et al.Zircon SHRIMP U-Pb dating of tuff bed of the Lengjiaxi and Banxi Groups,northeastern Hunan:Constraints on the Wuling Movement[J].Geological Bulletin of China,2011,30(7):1001-1008(in Chinese with English abstract).
[21]高林志,杨明桂,丁孝忠,等.华南双桥山群及河上镇群凝灰岩中的锆石SHRIMP U-Pb年龄:对江南新元古代造山带演化的制约[J].地质通报.2008,27(10):1744-1751.Gao Linzhi,Yang Minggui,Ding Xiaozhong,et al.New SHRIMP U-Pb dating for the Shuangqiaoshan Group in South China[J].Geological Bulletin of China,2008,27(10):1744-1751(in Chinese with English abstract).
[22]周效华,张彦杰,廖圣兵,等.皖赣相邻地区双桥山群火山岩的LA-ICP-MS锆石U-Pb年龄及其地质意义[J].高校地质学报,2012,18(4):609-622.Zhou Xiaohua,Zhang Yanjie,Liao Shengbing,et al.LA-ICPMS zircon U-Pb geochronology of volcanic rocks in the Shuangqiaoshan Group at Anhui-Jiangxi boundary region and its geological implication[J].Geological Journal of China Universities,2012,18(4):609-622(in Chinese with English abstract).
[23]高林志,丁孝忠,刘燕学,等.浙江浦江县蒙山地区陈塘坞组在地层柱中的位置——来自SHRIMP锆石U-Pb年龄的制约[J].地质通报,2013,32(7):988-995.Gao Linzhi,Ding Xiaozhong,Liu Yanxue,et al.The revision of the Chentangwu Formation in Neoproterozoic stratigraphic column:Constraints on zircon U-Pb dating of tuff from the Mengshan section in Pujiang County,Zhejiang Province[J].Geological Bulletin of China,2013,32(7):988-995(in Chinese with English abstract).
[24]高林志,黄志忠,丁孝忠,等.赣西北新元古代修水组合马涧桥组SHRIMP锆石U-Pb年龄[J].地质通报,2012,31(7):1086-1093.Gao Linzhi,Huang Zhizhong,Ding Xiaozhong,et al.Zircon SHRIMP U-Pb dating of Xiushui and Majianqiao Formations in northwestern Jiangxi Province[J].Geological Bulletin of China,2012,31(7):1086-1093(in Chinese with English abstract).
[2]王鸿桢,乔秀夫.中国元古代构造单元及其边界性质[C]//中国地质学会,中国科学院.国际前寒武纪地壳演化讨论论文集(3).北京:地质出版社,1986:1-13.Wang Hongzhen,Qiao Xiufu.Chinese Proterozoic tectonic units and boundary property[C]//Geological Society of China,Chinese Academy of Sciences.The Conference on International Precambrian Crustal Evolution Discussion(3).Beijing:Geological Pulishing House,1986:1-13(in Chinese).
[3]王鸿桢,王自强.华南地区古大陆边缘构造[M].武汉:武汉地质学院出版社,1986:1-272.Wang Hongzhen,Wang Ziqiang.Tectonic History of the Ancient Continental Margins of South China[M].Wuhan:Wuhan Geology Press,1986:1-272(in Chinese).
[4]韩发,沈建忠,聂凤军,等.江南古陆南缘四堡群同位素地址年代学研究[J].地球学报,1994,15(1):43-50.Han Fa,Shen Jianzhong,Nie Fengjun,et al.The geochronical studies of Sibao Group in the southern margin of Jiannan massif[J].Acta Geoscientia Sinica,1994,5(1):43-50(in Chinese with English abstract).
[5]王孝磊,周金城,邱检生,等.江南造山带西段前寒武基底地层LA-ICP-MS碎屑锆石U-Pb年代学[C]//2006年全国岩石学与地球动力学研讨会.2016:247.Wang Xiaolei,Zhou Jincheng,Qiu Jiansheng,et al.Study on LA-ICP-MS detrital zircon ages of Precambrian basement in the western section of the Jiangnan orogenic belt[C]//The Petrological and Dynamics Conference in 2016.2016:247(in Chinese).
[6]高林志,丁孝忠,张传恒,等.江南古陆变质基底地层的修正和武陵运动构造意义[J].资源调查与环境,2012,33(2):71-76.Gao Linzhi,Ding Xiaozhong,Zhang Chuanheng,et al.A revised chronostratigraphic dating of metamorphosed basement strata of Jiangnan old land and its implication for Wuling tectonic movement[J].Resources Survey and Environment,2012,33(2):71-76(in Chinese with English abstract).
[7]高林志,戴传固,刘燕学,等.下江群甲路组凝灰岩锆石SHRIMPU-Pb年龄及其地层意义[J].中国地质,2010,37(4):1071-1082.Gao Linzhi,Dai Chuangu,Liu Yanxue,et al.Zircon SHRIMP UPb dating of tuff bed of the Xiajing Group and implication for its stratigraphy[J].Geology in China,2010,37(4):1071-1082(in Chinese with English abstract).
[8]高林志,戴传固,刘燕学,等.黔东南-桂北地区四堡群凝灰岩锆石SHRIMP U-Pb年龄及其地层学意义[J].地质通报,2010,29(9):1259-1267.Gao Linzhi,Dai Chuangu,Liu Yanxue,et al.Zircon SHRIMP UPb dating of tuff bed of the Sibao Group in southeastern Guizhounorthern Guangxi area,China and its stratigraphic implication[J].Geological Bulletin of China,2000,29(9):1259-1267(in Chinese with English abstract).
[9]董宝林.广西四堡群[J].地层学杂志,1991,15(2):139-142.Dong Baolin.Sibao Group in Guangxi[J].Journal of Sreatigraphy,1991,15(2):139-142(in Chinese).
[10]吴才来,董树文,王次松,等.铜陵地区晚古生代岩浆活动的发现:来自凤凰山岩体ZK钻孔岩心辉绿岩锆石U-Pb定年的证据[J].中国地质,2013,40(3):715-729.Wu Cailai,Dong shuwen,Wang Cisong,et al.The discovery of late Paleozoic magmatism in Tongling area:Evidence from zircon U-Pb dating of diabse in Fenghuangshan ZK66 driling core[J].Geology in China,2013,40(3):715-729(in Chinese with English abstract).
[11]江思宏,梁清玲,聂凤军,等.内蒙古林西双井子杂岩锆石LA-MC-ICP-MS测年初步研究[J].中国地质,2014,41(4):1108-1123.Jiang Sihong,Liang Qingling,Nie Fengjun,et al.A preliminary study of zircon LA-MC-ICP-MS U-Pb ages of the Shuangjingzi complex in Linxi,Inner Mongolia[J].Geology in China,2014,41(4):1108-1123(in Chinese with English abstract).
[12]孟元库,许志琴,陈希节,等.冈底斯中段碱长花岗岩锆石UPb-Hf同位素特征及地质意义[J].中国地质,2015,(5):1202-1213.Meng Yuanku,Xu Zhiqin,Chen Xijie,et al.Isotope study of alkali-feldspar granite zircon in the middle Gangdise batholith and its geological significance[J].Geology in China,2015,(5):1202-1213(in Chinese with English abstract).
[13]Li X H,Li W X,Li Z X,et al.Amalgamation between the Yangtze and Cathaysia Blocks in South China:Constrains from SHRIMP U-Pb zircon ages,geochemistry and Nd-Hf isotopes of the Shuangxiwu volcanic rocks[J].Precambrain Reswarch,2009,174:117-128.
[14]Zhou J C,Wang W L,Qiu J S.Geochronology of Neoproterozoic mafic rocks and sandstones from northeastern Guizhou,South China:Coeval arc magmatism and sedimentation[J].Precambrain Reswarch,2009,170:27-42.
[15]Wang X L,Zhou J C,Griffin W L,et al.Detrital zircon geochronology of Precambrian basement sequences in the Jiangnan orogeny:Dating the assembly of the Yangtze and Cathysia blocks[J].Precambrian Research,2007,159:117-131.
[16]张传恒,高林志,史晓颖,等.梵净山群火山岩锆石SHRIMP年龄及其年代地层学意义[J].地学前缘.2014,21(2):139-143.Zhang Chuanheng,Gao Linzhi,Shi Xiaoying,et al.SHRIMP age of the volcanic rock from the Fanjingshan Group and its chronostratigraphic significances[J].Earth Science Frontiers,2014,21(2):139-143(in Chinese with English abstract).
[17]王敏,戴传固,王雪华,等.贵州梵净山白云母花岗岩锆石年代、铪同位素及对华南地壳生长的制约[J].地学前缘.2011,18(5):213-223.Wang Min,Dai Chuangu,Wang Xuehua,et al.In-situ zircon geochronology and Hf isotope of muscovite-bearing leucogranites from Fanjingshan,Guizhou Province,and constraints on continental growth of the Southern China block[J].Earth Science Frontiers,2011,18(5):213-223(in Chinese with English abstract).
[18]高林志,戴传固,丁孝忠,等.侵入梵净山群白岗岩锆石U-Pb年龄及白岗岩底砾岩对下江群沉积的制约[J].中国地质.2011,38(6):1111-1118.Gao Linzhi,Dai Chuangu,Ding Xiaozhong,et al.SHRIMP UPb dating of intrusive alaskite in the Fangjingshan Group and alaskite basal conglomerates:constraints on the deposition of Xiajiang Group[J].Geology in China,2011,38(6):1111-1118(in Chinese with English abstract).
[19]孟庆秀,张健,耿建珍,等.湘中地区冷家溪群和板溪群锆石U-Pb年龄、Hf同位素特征及对华南新元古代构造演化的意义[J].中国地质,2013,40(1):191-216.Meng Qingxiu,Zhang Jian,Geng Jianzhen,et al.Zircon U-Pb age and Hf isotope compositions of Lengjiaxi and Baxi groups in middle Hunan Province:Implications for the Neoproterozoic tectonic evolution in South China[J].Geology in China,2013,40(1):191-216(in Chinese with English abstract).
[20]高林志,陈峻,丁孝忠,等.湘东北岳阳地区冷家溪群及板溪群凝灰岩SHRIMP锆石U-Pb年龄——对武陵运动的制约[J].地质通报.2011,30(9):1001-1008.Gao Linzhi,Chen Jun,Ding Xiaozhong,et al.Zircon SHRIMP U-Pb dating of tuff bed of the Lengjiaxi and Banxi Groups,northeastern Hunan:Constraints on the Wuling Movement[J].Geological Bulletin of China,2011,30(7):1001-1008(in Chinese with English abstract).
[21]高林志,杨明桂,丁孝忠,等.华南双桥山群及河上镇群凝灰岩中的锆石SHRIMP U-Pb年龄:对江南新元古代造山带演化的制约[J].地质通报.2008,27(10):1744-1751.Gao Linzhi,Yang Minggui,Ding Xiaozhong,et al.New SHRIMP U-Pb dating for the Shuangqiaoshan Group in South China[J].Geological Bulletin of China,2008,27(10):1744-1751(in Chinese with English abstract).
[22]周效华,张彦杰,廖圣兵,等.皖赣相邻地区双桥山群火山岩的LA-ICP-MS锆石U-Pb年龄及其地质意义[J].高校地质学报,2012,18(4):609-622.Zhou Xiaohua,Zhang Yanjie,Liao Shengbing,et al.LA-ICPMS zircon U-Pb geochronology of volcanic rocks in the Shuangqiaoshan Group at Anhui-Jiangxi boundary region and its geological implication[J].Geological Journal of China Universities,2012,18(4):609-622(in Chinese with English abstract).
[23]高林志,丁孝忠,刘燕学,等.浙江浦江县蒙山地区陈塘坞组在地层柱中的位置——来自SHRIMP锆石U-Pb年龄的制约[J].地质通报,2013,32(7):988-995.Gao Linzhi,Ding Xiaozhong,Liu Yanxue,et al.The revision of the Chentangwu Formation in Neoproterozoic stratigraphic column:Constraints on zircon U-Pb dating of tuff from the Mengshan section in Pujiang County,Zhejiang Province[J].Geological Bulletin of China,2013,32(7):988-995(in Chinese with English abstract).
[24]高林志,黄志忠,丁孝忠,等.赣西北新元古代修水组合马涧桥组SHRIMP锆石U-Pb年龄[J].地质通报,2012,31(7):1086-1093.Gao Linzhi,Huang Zhizhong,Ding Xiaozhong,et al.Zircon SHRIMP U-Pb dating of Xiushui and Majianqiao Formations in northwestern Jiangxi Province[J].Geological Bulletin of China,2012,31(7):1086-1093(in Chinese with English abstract).