河南泌阳地区变质花岗岩体的锆石铀-铅年龄及其地质意义
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摘要
华北克拉通为中国最古老的克拉通,基底形成时经历了多期岩浆-构造热事件,前寒武纪基底上发育有大量的不同时代的花岗岩体。为了厘定分布在华北克拉通南缘的河南泌阳地区的前寒武纪变质花岗岩体的形成年龄,采用高精度的激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS)锆石铀-铅(U-Pb)同位素测年方法对其进行精确定年。实验结果表明,变质花岗岩中锆石具有典型的岩浆结晶成因特征,但可能受到后期构造热事件的扰动影响发生同位素的丢失。该变质岩体四个锆石样品的~(206)Pb/~(207)Pb上交点年龄在误差范围内基本一致,给出了2 510～2 556 Ma的年龄,代表了岩体形成年龄。工作表明该地区变质花岗岩形成于新太古代晚期,而不是前人在区调工作中认为的中-新元古代,为华北克拉通南缘的早期岩浆-构造演化研究提供了年代学依据。
North China Craton as a oldest craton in China were experienced intense and widespread magmatismtectonic events. In order to confirm the ages of the Precambrian metamorphic granitoids in the Biyang area of southern margin of the North China Craton,laser ablation-inductively coupled plasma-mass spectrometer(LA-ICP-MS)zircon U-Pb method was conducted for dating. The U-Pb dating results suggest that the zircons of granitoid are magmatic zircons with typical magmatic oscillatory zoning,but they also probably were transformed by late tectonic thermal events. The upper intercept age of ~(206) Pb/~(207) Pb are supposed to represent the meta-granitoid crystallization age.The ages from 2 510 Ma to 2 556 Ma in Neoarchean were confirmed by zircon isotopic ages of four rock samples,consistently. The precise ages of the meta-granitoid rocks were provided and the basis data also were supplied for the subsequent studies of the early tectonic evolution of southern margin of the North China Craton.
North China Craton as a oldest craton in China were experienced intense and widespread magmatismtectonic events. In order to confirm the ages of the Precambrian metamorphic granitoids in the Biyang area of southern margin of the North China Craton,laser ablation-inductively coupled plasma-mass spectrometer(LA-ICP-MS)zircon U-Pb method was conducted for dating. The U-Pb dating results suggest that the zircons of granitoid are magmatic zircons with typical magmatic oscillatory zoning,but they also probably were transformed by late tectonic thermal events. The upper intercept age of ~(206) Pb/~(207) Pb are supposed to represent the meta-granitoid crystallization age.The ages from 2 510 Ma to 2 556 Ma in Neoarchean were confirmed by zircon isotopic ages of four rock samples,consistently. The precise ages of the meta-granitoid rocks were provided and the basis data also were supplied for the subsequent studies of the early tectonic evolution of southern margin of the North China Craton.
引文
1 Zhao Y,Li N B,Jiang Y H,et al.Petrogenesis of the Late Archean(~2.5 Ga)Na-and K-rich granitoids in the Zhongtiao-Wangwu region and its tectonic significance for the crustal evolution of the North China Craton[J].Precambrian Research,2017,303(S1):509-603
2 Wan Y S,Dong C Y,Liu D Y,et al.Zircon ages and geochemistry of late Neoarchean syenogranites in the North China Craton:A review[J].Precambrian Research,2012,222(S1):265-289
3 Lu X P,Wu F Y,Guo J H,et al.Zircon U-Pb geochronological constraints on the Paleoproterozoic crustal evolution of the Eastern Block in the North China Craton[J].Precambrian Research,2006,146(3):138-164
4 Zhou Y Y,Zhai M G,Zhao T P,et al.Geochronological and geochemical constraints on the petrogenesis of the early Paleoproterozoic potassic granite in the Lushan area,southern margin of the North China Craton[J].Journal of Asian Earth Sciences,2014,94(S1):190-240
5 Wu F Y,Lin J Q,Wilde S A,et al.Nature and significance of the Early Cretaceous giant igneous event in eastern China[J].Earth&Planetary Science Letters,2005,233(1):103-119
6常泽光,杨浩,周安朝.山西吕梁地区狐偃山碱性杂岩体LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(2-3):372-380Chang Zeguang,Yang Hao,Zhou Anchao.LA-ICP-MS zircon U-Pb geochronology of the Huyanshan alkaline intrusive complex in the Lüliang Mountain of North China Craton and its geological significance[J].Geological Bulletin of China,2017,36(2-3):237-380
7 Wu F Y,Zhang Y B,Yang J H,et al.Zircon U-Pb and Hf isotopic constraints on the Early Archean crustal evolution in Anshan of the North China Craton[J].Precambrian Research,2008,167(S1):339-362
8 Zhao G,Sun M,Wilde S A,et al.Late Archaean to Palaeoproterozoic evolution of the Trans-North China Orogen:Insights from synthesis of existing data from the Hengshan-Wutai-Fuping belt[J].Geological Society London Special Publications,2004,226(1):27-55
9张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001Zhang Guowei,Zhang Benren,Yuan Xuecheng,et al.Qinling orogenic belt and continental dynamics[M].Beijing:Science Press,2001
10 Diwu C R,Sun Y,Zhang H,et al.Episodic tectonothermal events of the western North China Craton and North Qinling Orogenic Belt in central China:Constraints from detrital zircon U-Pb ages[J].Journal of Asian Earth Sciences,2012,47(1):107-122
11江思宏,聂凤军,方东会,等.河南桐柏围山城地区侵入岩年代学与地球化学特征[J].地质学报,2009,83(7):1011-1029Jiang Sihong,Nie Fengjun,Fang Donghui,et al.Geochronology and geochemical features of the main intrusive rocks in the Weishancheng area,Tongbai County,Henan[J].Acta Geologica Sinica,2009,83(7):1011-1029
12翟淳.河南泌阳桃园和梁湾花岗岩类岩石特征[J].成都地质学院学报,1982(4):23-33Zhai Chun.On the characteristics of the granitoides in Taoyuan and Liangwan,Biyang County,Henan[J].Geological Journal of Chengdu,1982(4):23-33
13谷浩.河南泌阳县陈庄-马谷田一带桃园岩体形成构造环境:岩石地球化学及锆石年代学证据[J].华南地质与矿产,2017,33(2):111-126Gu Hao.Genesis of Taoyuan intrusion in Chenzhuang-Magutian area,Biyang County,Henan Province:Evidence from geochemistry and zircon U-Pb geochronology[J].Geology and Mineral Resources of South China,2017,33(2):111-126
14 Liu Y,Hu Z,Gao S,et al.In situ,analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1):34-43
15 Ludwig K R.Isoplotv.3.0:A geochronological toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronological Center Publication,2003
16 Rubatto D,Gebauer D.Use of cathodoluminescence for U-Pb zircon dating by ion microprobe:Some examples from the western alps[M]//Cathodoluminescence in Geosciences.Berlin Heidelberg:Springer,2000:373-400
17 Diwu C,Yong S,Guo A,et al.Crustal growth in the North China Craton at~2.5 Ga:Evidence from in situ zircon U-Pb ages,Hf isotopes and whole-rock geochemistry of the Dengfeng complex[J].Gondwana Research,2011,20(1):149-170
18张瑞英,孙勇.华北克拉通南部早前寒武纪基底形成与演化[J].岩石学报,2017,33(10):3027-3041Zhang Ruiying,Sun Yong.Formation and evolution of Early Precambrian basement in the southern North China Craton[J].Acta Petrologica Sinica,2017,33(10):3027-3041
19 Zhai M,Santosh M.Metallogeny of the North China Craton:Link with secular changes in the evolving Earth[J].Gondwana Research,2013,24(1):275-297
20 Zhai M.Multi-stage crustal growth and cratonization of the North China Craton[J].Geoscience Frontiers,2014,5(4):457-469
2 Wan Y S,Dong C Y,Liu D Y,et al.Zircon ages and geochemistry of late Neoarchean syenogranites in the North China Craton:A review[J].Precambrian Research,2012,222(S1):265-289
3 Lu X P,Wu F Y,Guo J H,et al.Zircon U-Pb geochronological constraints on the Paleoproterozoic crustal evolution of the Eastern Block in the North China Craton[J].Precambrian Research,2006,146(3):138-164
4 Zhou Y Y,Zhai M G,Zhao T P,et al.Geochronological and geochemical constraints on the petrogenesis of the early Paleoproterozoic potassic granite in the Lushan area,southern margin of the North China Craton[J].Journal of Asian Earth Sciences,2014,94(S1):190-240
5 Wu F Y,Lin J Q,Wilde S A,et al.Nature and significance of the Early Cretaceous giant igneous event in eastern China[J].Earth&Planetary Science Letters,2005,233(1):103-119
6常泽光,杨浩,周安朝.山西吕梁地区狐偃山碱性杂岩体LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(2-3):372-380Chang Zeguang,Yang Hao,Zhou Anchao.LA-ICP-MS zircon U-Pb geochronology of the Huyanshan alkaline intrusive complex in the Lüliang Mountain of North China Craton and its geological significance[J].Geological Bulletin of China,2017,36(2-3):237-380
7 Wu F Y,Zhang Y B,Yang J H,et al.Zircon U-Pb and Hf isotopic constraints on the Early Archean crustal evolution in Anshan of the North China Craton[J].Precambrian Research,2008,167(S1):339-362
8 Zhao G,Sun M,Wilde S A,et al.Late Archaean to Palaeoproterozoic evolution of the Trans-North China Orogen:Insights from synthesis of existing data from the Hengshan-Wutai-Fuping belt[J].Geological Society London Special Publications,2004,226(1):27-55
9张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001Zhang Guowei,Zhang Benren,Yuan Xuecheng,et al.Qinling orogenic belt and continental dynamics[M].Beijing:Science Press,2001
10 Diwu C R,Sun Y,Zhang H,et al.Episodic tectonothermal events of the western North China Craton and North Qinling Orogenic Belt in central China:Constraints from detrital zircon U-Pb ages[J].Journal of Asian Earth Sciences,2012,47(1):107-122
11江思宏,聂凤军,方东会,等.河南桐柏围山城地区侵入岩年代学与地球化学特征[J].地质学报,2009,83(7):1011-1029Jiang Sihong,Nie Fengjun,Fang Donghui,et al.Geochronology and geochemical features of the main intrusive rocks in the Weishancheng area,Tongbai County,Henan[J].Acta Geologica Sinica,2009,83(7):1011-1029
12翟淳.河南泌阳桃园和梁湾花岗岩类岩石特征[J].成都地质学院学报,1982(4):23-33Zhai Chun.On the characteristics of the granitoides in Taoyuan and Liangwan,Biyang County,Henan[J].Geological Journal of Chengdu,1982(4):23-33
13谷浩.河南泌阳县陈庄-马谷田一带桃园岩体形成构造环境:岩石地球化学及锆石年代学证据[J].华南地质与矿产,2017,33(2):111-126Gu Hao.Genesis of Taoyuan intrusion in Chenzhuang-Magutian area,Biyang County,Henan Province:Evidence from geochemistry and zircon U-Pb geochronology[J].Geology and Mineral Resources of South China,2017,33(2):111-126
14 Liu Y,Hu Z,Gao S,et al.In situ,analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1):34-43
15 Ludwig K R.Isoplotv.3.0:A geochronological toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronological Center Publication,2003
16 Rubatto D,Gebauer D.Use of cathodoluminescence for U-Pb zircon dating by ion microprobe:Some examples from the western alps[M]//Cathodoluminescence in Geosciences.Berlin Heidelberg:Springer,2000:373-400
17 Diwu C,Yong S,Guo A,et al.Crustal growth in the North China Craton at~2.5 Ga:Evidence from in situ zircon U-Pb ages,Hf isotopes and whole-rock geochemistry of the Dengfeng complex[J].Gondwana Research,2011,20(1):149-170
18张瑞英,孙勇.华北克拉通南部早前寒武纪基底形成与演化[J].岩石学报,2017,33(10):3027-3041Zhang Ruiying,Sun Yong.Formation and evolution of Early Precambrian basement in the southern North China Craton[J].Acta Petrologica Sinica,2017,33(10):3027-3041
19 Zhai M,Santosh M.Metallogeny of the North China Craton:Link with secular changes in the evolving Earth[J].Gondwana Research,2013,24(1):275-297
20 Zhai M.Multi-stage crustal growth and cratonization of the North China Craton[J].Geoscience Frontiers,2014,5(4):457-469