南祁连东段巴汉岩体片麻状花岗闪长岩锆石U-Pb年龄及地质意义
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摘要
为了确定南祁连东段巴汉岩体的形成时代,文中应用LA-ICP-MS方法对巴汉岩体的片麻状花岗闪长岩体进行锆石U-Pb同位素年龄测试。测试结果显示:同位素表面平均加权值主要集中在900～940 Ma,锆石U-Pb年龄谐和图中25个数据集中分布在谐和线上及其附近,锆石U-Pb年龄为(916±11)Ma。根据测试结果确定巴汉岩体形成时代应为新元古代。巴汉岩体与化隆岩群呈侵入接触,化隆岩群形成于古远古代,即在新元古代时巴汉岩体侵入化隆岩群。
In order to determine the formation age of the Bahan rock in the eastern part of South Qilian,the LA-ICP-MS method is used to measure the zircon U-Pb isotopic age of the granodiorite in the Bahan rock mass.The weighted average values of isotopic surface age are concentrated at 900～940 Ma.The 25 data sets in the zircon U-Pb age harmonic map are distributed on and around the harmonic line.Zircon U-Pb age is(916 ± 11)Ma.According to the test results,the formation age of Bahan rock body should be Neoproterozoic.The Hualong rock group was formed in the ancient far ancient times,and the Bahan rock mass and the Hualong rock group showed intrusive contact,that is,in the Neoproterozoic,the Bahan rock mass invaded the Hualong rock group.
In order to determine the formation age of the Bahan rock in the eastern part of South Qilian,the LA-ICP-MS method is used to measure the zircon U-Pb isotopic age of the granodiorite in the Bahan rock mass.The weighted average values of isotopic surface age are concentrated at 900～940 Ma.The 25 data sets in the zircon U-Pb age harmonic map are distributed on and around the harmonic line.Zircon U-Pb age is(916 ± 11)Ma.According to the test results,the formation age of Bahan rock body should be Neoproterozoic.The Hualong rock group was formed in the ancient far ancient times,and the Bahan rock mass and the Hualong rock group showed intrusive contact,that is,in the Neoproterozoic,the Bahan rock mass invaded the Hualong rock group.
引文
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[2] 贾群子,杨钟堂,肖朝阳,等.祁连山金属矿床成矿带划分及分布规律[J].矿床地质,2002,21(S):140-141.
[3] 马文,贾建团,李五福,等.南祁连东段阳康地区辉长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].西北地质,2017,50(3):75-76.
[4] 刘娜,任二峰,张天继,等.南祁连东段早古生代梁脊岩体岩浆岩锆石U-Pb年龄及地球化学特征研究[J].青海大学学报(自然科学版),2016,34(1):81-82.
[5] 邱成贵,李志斌.南祁连化隆岩群形成时代的新证据[J].西部资源,2016(6):8-9.
[6] 余吉远,李向民,马中平,等.南祁连化隆岩群LA-ICP-MS锆石U-Pb年龄及其地质意义[J].西北地质,2012,45(1):79-85.
[7] 何世平,李荣社,王超,等.南祁连东段化隆岩群形成时代的进一步限定[J].岩石矿物学杂志,2011,30(1):34-44.
[8] 康伟浩,任二峰,高亮.青海南祁连东段化隆岩群重新厘定及地质意义[J].青海大学学报,2016,34(5):51-53.
[9] 张新虎,苟国朝,田培昭,等.祁连山-北山地区古板块及地体构造的划分[J].西北地质,1994,15(1):1-5.
[10] 左国朝,李志林.拉鸡山裂谷带特征及演化[J].甘肃地质学报,2001(1):26-31.
[11] 潘桂棠,李兴振,王立全,等.青藏高原及邻区大地构造单元初步划分[J].地质通报,2002,21(11):702-704.
[12] 青海省地质矿产局.青海省岩石地层[M].武汉:中国地质大学出版社,1997:16-22.
[13] 潘桂棠,丁俊.1∶150万青藏高原及邻区地质图(附说明书)[CM].成都:成都地图出版社,1988.
[14] 青海省地质矿产局.青海省区域地质志[M].北京:地质出版社,1991:100-135.
[15] LIU Y S,GAO S,HU Z,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.
[16] 金婷婷,陈健,张尧,等.李家山早元古代化隆群变质岩原岩恢复及变质作用的新认识[J].青海国土经略,2015(5):53-57.
[17] WANG T,WANG Z Q,ZHEN Y,et al.Geochronological and Geochemical evidence of amphibolite from the Hualong Group,northwest China:Implication for the early Paleozoic accretionary tectonics of the Central Qilian belt[J].LITHOS,2016,248-251:12-21.