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| 东准噶尔卡姆斯特北海相火山-沉积岩碎屑锆石LA-ICP-MS U-Pb年龄及地质意义 | |
| 引用本文： | 王一剑,刘洪军,周娟萍,渠洪杰.东准噶尔卡姆斯特北海相火山-沉积岩碎屑锆石LA-ICP-MS U-Pb年龄及地质意义[J].现代地质,2011,25(6). |
| 作者姓名： | 王一剑 刘洪军 周娟萍 渠洪杰 |
| 作者单位： | 1. 中国地质大学地球科学与资源学院,北京,100083 2. 西安石油大学油气资源学院,陕西西安,710065 3. 中国地质科学院地质力学研究所,北京,100081 |
| 摘 要： | 运用LA-ICP-MS U-Pb法,对位于东准噶尔卡姆斯特北部10 km处有争议的海相碎屑岩样品进行了U-Pb年龄测定,共测试碎屑锆石100颗,其中有效年龄数据点共90个。测试结果表明:(1)该套岩层的形成年龄可能为早石炭世。因为最年轻的谐和年龄为333.2 Ma,限定了该岩层的沉积下限。(2)该套岩层有多个物源区。碎屑锆石定年结果与区域岩浆热事件对比结果表明:早寒武世碎屑锆石(523.1 Ma、535.1 Ma)可能来自前人所述的准噶尔前寒武纪结晶基底,但有待进一步研究;中—晚奥陶世碎屑锆石(440.0 Ma、460.9 Ma)来自荒草坡群火山碎屑岩;早志留世碎屑锆石(429.3 Ma)可能来源于周边地区沉积的下志留统;中泥盆世碎屑锆石((371.5±2.5)Ma)来自卓木巴斯套组和乌鲁苏巴斯套组地层;早石炭世碎屑锆石((336.4±0.8)～(353.5±0.7)Ma)来自南明水组。(3)在测试的碎屑锆石中,有一颗锆石年龄为2 676.2 Ma,谐和度为99%,为可能存在前寒武纪古老结晶基底提供了一定的依据,但有待更进一步的证据。 |
| 关 键 词： | 碎屑锆石U-Pb定年 物源分析 基底 东准噶尔 |
LA-ICP-MS U-Pb Dating of Detrital Zircons from the Marine Volcanic-Sedimentary Rock in the Northern Kamste,Eastern Junggar and Its Geological Significance |
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| WANG Yi-jian,LIU Hong-jun,ZHOU Juan-ping,QU Hong-jie.LA-ICP-MS U-Pb Dating of Detrital Zircons from the Marine Volcanic-Sedimentary Rock in the Northern Kamste,Eastern Junggar and Its Geological Significance[J].Geoscience——Journal of Graduate School,China University of Geosciences,2011,25(6). | |
| Authors: | WANG Yi-jian LIU Hong-jun ZHOU Juan-ping QU Hong-jie |
| Institution: | WANG Yi-jian1,LIU Hong-jun2,ZHOU Juan-ping1,QU Hong-jie3(1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China,2.School of Petroleum Resources,Xi'an Shiyou University,Xi'an,Shaanxi 710065,3.Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China) |
| Abstract: | There has been a controversy in zircon U-Pb ages of marine volcanic-sedimentary detrital rock,which occurred in 10 km away from the northern Kamste in Eastern Junggar.Thus,the zircon U-Pb ages of detrital rock were measured by the LA-ICP-MS method.And 100 detrital zircons had been tested totally,of which 90 ages of these zircons are useful.The dating results have shown that:(1)the formation age of this rock stratum may be Early Carboniferous,because the deposition time was later than 333.2 Ma which has been... |
| Keywords: | detrital zircon U-Pb dating provenance analysis basement Eastern Junggar |
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