| 中国东北额尔古纳地块新太古代岩浆事件——钻孔片麻状二长花岗岩锆石LA-ICP-MS测年证据 |
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| 引用本文： | 邵军,李永飞,周永恒,王宏博,张璟.中国东北额尔古纳地块新太古代岩浆事件——钻孔片麻状二长花岗岩锆石LA-ICP-MS测年证据[J].吉林大学学报(地球科学版),2015(2):364-373. |
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| 作者姓名： | 邵军 李永飞 周永恒 王宏博 张璟 |
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| 作者单位： | 沈阳地质矿产研究所/中国地质调查局沈阳地质调查中心,沈阳,110034 |
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| 基金项目： | 中国地质调查局地质大调查项目(1212011120328,12120114001101,1212011121085) |
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| 摘 要： | 额尔古纳地块基底岩石时代与构造属性一直颇受争议。笔者对额尔古纳地块南部比列亚铅锌多金属矿区ZK6301钻孔226m片麻状二长花岗岩岩心进行了锆石LA-ICP-MS定年。测试结果显示,24个测试点的数据均在谐和线上,207Pb/206Pb年龄包括4个不同年龄区段,分别为:2 549~2 562 Ma(加权平均年龄为(2 555±19)Ma,MSWD=0.17,n=3),2 596~2 624 Ma(加权平均年龄为(2 606±17)Ma,MSWD=0.032,n=17),2 688~2 715 Ma(加权平均年龄为(2 702±18)Ma,MSWD=0.70,n=3),2 786Ma(n=1)。通过锆石的Th,U质量分数与Th/U值分析,207 Pb/206 Pb年龄((2 606±17)Ma)代表了该片麻状二长花岗岩的结晶年龄;207Pb/206Pb年龄((2 549~2 562)Ma)很可能代表了构造热事件的作用年龄;本次报道的岩石结晶年龄,揭示了额尔古纳地块上存在新太古代的结晶基底。结合前人研究资料分析可知,额尔古纳地块上该期变质结晶基底可能在该地块的南、北部均有分布,并且得尔布干断裂可能并非该地块的南部边界。综合分析前寒武纪古老地块的演化历史可得出,额尔古纳地块经历了全球大陆构造旋回演化的完整过程。
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| 关 键 词： | 额尔古纳地块 片麻状二长花岗岩 锆石 UPb 年龄 新太古代 得尔布干断裂 比列亚铅锌多金属矿区 |
Neo-Archaean Magmatic Event in Erguna Massif of Northeast China:Evidence from the Zircon LA ICP MS Dating of the Gneissic Monzogranite from the Drill |
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| Shao Jun
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Li Yongfei
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Zhou Yongheng
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Wang Hongbo
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Zhang Jing.Neo-Archaean Magmatic Event in Erguna Massif of Northeast China:Evidence from the Zircon LA ICP MS Dating of the Gneissic Monzogranite from the Drill[J].Journal of Jilin Unviersity:Earth Science Edition,2015(2):364-373. |
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| Authors: | Shao Jun Li Yongfei Zhou Yongheng Wang Hongbo Zhang Jing |
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| Institution: | Shao Jun;Li Yongfei;Zhou Yongheng;Wang Hongbo;Zhang Jing;Shenyang Institute of Geology and Mineral Resources/Shenyang Center of Geological Survey,China Geological Survey; |
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| Abstract: | The nature and age of the basement of Erguna massif had long been a geological controversy.The zircon LA ICP MS dating of the Gneissic monozgranite from the drill (No.ZK6301, Depth:226 m)of the Pb Zn polymetallic deposit in Biliya,southwestern Derbugan county has been conducted.The results yield 4 different groups of concordant age:2 549 2 562 Ma(weighted-mean age:(2 555±1 9)Ma,MSWD=0.17,n=3),2 596 2 624 Ma(weighted-mean age(2 606 ±17)Ma,MSWD=0.032,n=17),2 688 2 715 Ma(weighted-mean age(2 702 ±18)Ma,MSWD=0.70,n =3),2 786 Ma (n=1).Their zircon U Pb dating plots (24 out of 29 plots)show a remarkable consistence.Based on the zircon spot analysis for its Th,U content and Th/U ratios,the 207 Pb/206 Pb age of 2 549 2 562 Ma implies a late tectono-thermal event;and the weighted-mean age 2 606±17 Ma (MSWD=0.032,n=17) reflects the crystallization age in corresponding to the period of Neo-Archaean.In connection with the previous studies,the old basement of Erguna massif probably widely distributes in the south and north region.This suggests a far south extension of this massif beyond Derbugan fault.This can help to understand the palinspastic reconstruction for the eastern part of the Central Asian Orogenic Belt (CAOB). |
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| Keywords: | Erguna massif gneissic monzogranite zircon U Pb dating Neo-Proterozoic Derbugan fault Biliya Pb Zn polymetallic deposit |
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