辽宁盖县梁屯—矿洞沟碱性正长岩杂岩体的U—Pb和Sm—Nd年龄及其地质意义

蔡剑辉,阎国翰,牟保磊,许保良,邵宏翔,许荣华. 辽宁盖县梁屯—矿洞沟碱性正长岩杂岩体的U—Pb和Sm—Nd年龄及其地质意义[J]. 岩石学报, 2002, 18(3): 349-354.
引用本文: 蔡剑辉,阎国翰,牟保磊,许保良,邵宏翔,许荣华. 辽宁盖县梁屯—矿洞沟碱性正长岩杂岩体的U—Pb和Sm—Nd年龄及其地质意义[J]. 岩石学报, 2002, 18(3): 349-354.
Cai JH,Yan GH,Mu BL,Xu BL,Shao HX and Xu RH. 2002. 1. Faculty of Earth and Space Sciences,Peking University,Beijing 100871,China2. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China 3. Institute of Geology and Geophysics,Chinese Academy of Scineces,Beijing 100029,China. U-Pb and Sm-Nd isotopic ages of an alkaline syenite complex body in Liangtun-Kuangdongguo, Gai County, Liaoning Province, China and their geological significance.[J]. Acta Petrologica Sinica, 2002, 18(3): 349-354.
Citation: Cai JH,Yan GH,Mu BL,Xu BL,Shao HX and Xu RH. 2002. 1. Faculty of Earth and Space Sciences,Peking University,Beijing 100871,China2. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China 3. Institute of Geology and Geophysics,Chinese Academy of Scineces,Beijing 100029,China. U-Pb and Sm-Nd isotopic ages of an alkaline syenite complex body in Liangtun-Kuangdongguo, Gai County, Liaoning Province, China and their geological significance.[J]. Acta Petrologica Sinica, 2002, 18(3): 349-354.

辽宁盖县梁屯—矿洞沟碱性正长岩杂岩体的U—Pb和Sm—Nd年龄及其地质意义

  • 基金项目:

    国家自然科学基金项目 ( 4 0 0 72 0 2 4493 73 170 )资助

U-Pb and Sm-Nd isotopic ages of an alkaline syenite complex body in Liangtun-Kuangdongguo, Gai County, Liaoning Province, China and their geological significance.

  • 辽宁梁屯 -矿洞沟杂岩体主要由辉石正长岩、霓辉正长岩和霓辉角闪正长岩等碱性岩石组成 ,具有全岩 Rb- Sr等时线年龄 186 6± 115 Ma和 ISr=0 .70 4 9的同位素特征 ,是我国目前报道的最古老的碱性正长岩类。本文报道了该岩体的锆石U- Pb和全岩 Sm- Nd同位素测试资料 ,获得了锆石 U- Pb同位素年龄为 185 7± 2 0 Ma、Sm- Nd等时年龄为 1787± 180 Ma、εNd(t) =- 4 .8~ - 5 .0的数据。它们反映出该杂岩体形成年龄的上限为 185 7± 2 0 Ma、下限不小于 1787± 180 Ma,来源于富集地幔物质。基于这些数据并结合区域地质资料分析 ,作者提出了华北地台北缘古元古宙存在有富集地幔储库 ,以及辽河群主体形成于 190 0 Ma以前的认识
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修回日期:  2001-10-18
刊出日期:  2002-08-31

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