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关于额尔古纳地块基底性质和东界的讨论
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  • 英文篇名:Discussion on the basement properties and east boundary of the Ergun massif
  • 作者:张丽 ; 刘永江 ; 李伟民 ; 韩国卿 ; 张金带 ; 郭庆银 ; 李长华
  • 英文作者:Zhang Li;Liu Yongjiang;Li Weimin;Han Guoqing;Zhang Jindai;Zhao Zhonghua;Jian Xiaofei;Guo Qingyin;College of Earth Sciences,Jilin University;University of Salzburg,Institute of Geology and Geography;Department of China Geology and Mining;No.240 Institute of Nuclear Industry;
  • 关键词:额尔古纳地块 ; 太平林场岩体 ; 兴安地块 ; 塔河-喜桂图缝合带
  • 英文关键词:Ergun massif;;The Taiping Forest pluton;;Xing'an massif;;Tahe-Xiguitu suture zone
  • 中文刊名:DZKX
  • 英文刊名:Chinese Journal of Geology(Scientia Geologica Sinica)
  • 机构:吉林大学地球科学学院;萨尔茨堡大学地质地理系;中核集团地矿事业部;核工业243大队;
  • 出版日期:2013-01-15
  • 出版单位:地质科学
  • 年:2013
  • 期:v.48
  • 基金:额尔古纳-满洲里地区中生代内生铀及多金属区域成矿地质环境研究项目(编号:200805);; 松辽盆地及外围上古生界油气资源战略选区项目(编号:2009GYXQ12);; 博士点基金项目(编号:200801830041);; 兴蒙造山带东段多块体拼合与成矿体系项目(编号:2013CB429802)资助
  • 语种:中文;
  • 页:DZKX201301015
  • 页数:18
  • CN:01
  • ISSN:11-1937/P
  • 分类号:231-248
摘要
中国东北地区是解决东亚大陆构造演化的关键地区,备受众多学者关注。近年来,关于额尔古纳地块基底性质和东界问题一直存在争议。本文对太平林场花岗片麻岩进行了锆石LA-ICP-MS U-Pb测年,锆石年龄主要集中在840~830 Ma、800~780 Ma和730~720 Ma的3个时间段内,可能为新元古代时期的3期岩浆热事件时间。其中21个锆石测点~(206)Pb/~(238)U年龄的加权平均值为779±20 Ma(MSWD=8.3),表明原岩在新元古代就已侵位结晶;1个锆石测点U-Pb同位素年龄为494±10 Ma,Th/U比值为0.06,暗示了锆石应为变质成因,可能为花岗片麻岩的变质年龄。结合前人已报道额尔古纳地块和兴安地块上花岗质岩石年龄数据,对比发现仅额尔古纳地块经历了新元古代岩浆热事件作用;同时对比两地块上花岗岩Hf同位素特征发现,二者具有不同的地壳早期演化阶段。因此,在早古生代早期二者应该沿塔河—喜桂图缝合带拼合并共同经历了古生代以来的岩浆作用改造,而不是传统观点认为的德尔布干断裂作为两地块的边界。
        Northeast China is the critical area for solving the tectonic evolution of the East-Asian continent,it has thus drawn much attention.In recent years,the debates on the Ergun massif has been very intense,especially,the basement properties and the eastern boundary of Ergun massif.In this paper,the zircon LA-ICP-MS U-Pb dating for granitic gneiss of the Taiping Forest has been obtained,the zircon age mainly concentrates in the range of 840 ~ 830 Ma、800 ~ 780 Ma and 730 ~ 720 Ma,probably corresponds to three stages of magmatic event in Neoproterozoic.The weighted mean ~(206)Pb/~(238)U age of 21 analyzed zircon points yielded 779 ± 20 Ma(MSWD = 8.3),indicates that the original rock has emplaced and crystallized in Neoproterozoic;one zircon analysis shows U-Pb isotope age of 494±10 Ma,with the Th/U ratio is 0.06,suggesting that the zircon should be metamorphic origin,and this age therefore may be the metamorphic age of granite gneiss.Combine with the ages of granitoid that previously reported in Ergun massif and Xing'an massif,we concluded that only the Ergun massif has experienced the Neoproterozoic magmtic event;In addition,the Hf isotopic characteristics of granite in the Ergun massif and the Xing'an massif,obviously show different stages of initial evolution of the crust.Subsequent to the period of the collision between the Ergun massif and the Xing'an massif along the Tahe-Xiguitu suture zone in early Early Paleozoic,the two massifs have experienced Paleozoic magmatism together.The conclusions presented here significantly differ from the previous reported viewpoint that the Ergun massif and the Xing' an massif sutured along the Derbugan Fault.
引文
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    [1]“兴华渡口群”由徐烈1960年创名,1976年黑龙江省地层表工作队厘定,嗣后1:20万区调报告沿用(表尚虎等,1999).

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