白云鄂博矿床白云石型矿石中独居石单颗粒U-Th-Pb-Sm-Nd定年

刘玉龙　陈江峰　李惠民　钱卉　肖国望　张台荣

白云鄂博矿床白云石型矿石中独居石单颗粒U-Th-Pb-Sm-Nd定年

刘玉龙　陈江峰　李惠民　钱卉　肖国望　张台荣

- 中国科学技术大学地球物质循环实验室，中国科学技术大学地球物质循环实验室，天津地质矿产研究所，中国科学技术大学地球物质循环实验室，包头钢铁公司白云鄂博铁矿，包头钢铁公司白云鄂博铁矿地球和空间科学学院，230026 合肥，地球和空间科学学院，230026 合肥，300170 天津，地球和空间科学学院，230026 合肥，014000 包头，014000 包头
基金项目:
国家重点基础研究发展规划（973）项目（G199943201）,中国科学院合肥地区联合分析测试中心基金资助项目.

收稿日期: 2004-12-28

修回日期: 2004-12-28

刊出日期: 2005-05-31

Single-grain U-Th-Pb-Sm-Nd dating of monazite from dolomite type ore of the Bayan Obo deposit

LIU YuLong,CHEN JiangFeng,LI HuiMin,Qian Hui,Xiao GuoWang,Zhang TaiRong Earth Material Cycling Laboratory,School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China Tianjin Institute of Geology and Mineral Resourses,Tianjin 300170,China Bayan Obo Iron Mine,Baotou Steel and Iron Co.,Baotou 014000,China

Received Date: 28 December 2004

Revised Date: 28 December 2004

Publish Date: 31 May 2005

摘要

摘要: 使用交换树脂TRU Spec同时分离REE、U、Th、Pb及其他的元素,然后用阴离子交换树脂纯化Pb并用萃淋树脂分离纯化Sm和Nd,Sm、Nd、U和Pb的定量测定借助同位素稀释法,Th的定量测定则用ICP-MS分析,Nd和Pb同位素组成分析用质谱法(TIMS),从而实现独居石U-Th-Pb-Sm-Nd联合定年。用这种方法可以在同一样品上,同时得到U-Th-Pb和Sm-Nd同位素年龄记录。白云鄂博矿床白云石型稀土矿石中12个单颗粒独居石的U-Th-Pb-Sm-Nd同位素联合定年给出Sm-Nd等时线年龄为1008±320 Ma,其中8个独居石的Th-Pb等时线年龄为1231±200 Ma,此二年龄在误差范围内相似。在同一组独居石样品上得到一致的Th-Pb与Sm-Nd的中元古年龄,表明白云鄂博在中元古代的稀土成矿作用是可能的。本文独居石的Th-Pb 和Sm-Nd年龄与以前报道的独居石加里东期Th-Pb年龄差别很大,此问题尚需进一步研究。
- 白云鄂博 /
- 独居石 /
- TRU /
- Spec /
- U—Th—Pb—Sm—Nd联合定年
- Bayan Obo /
- Monazite /
- TRU Spec /
- Combined U-Th-Pb-Sm-Nd dating technique /

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参考文献(41)

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白云鄂博矿床白云石型矿石中独居石单颗粒U-Th-Pb-Sm-Nd定年

Single-grain U-Th-Pb-Sm-Nd dating of monazite from dolomite type ore of the Bayan Obo deposit

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