贵州织金含稀土磷矿床的Sm-Nd同位素年龄及其地质意义

施春华; 胡瑞忠

贵州织金含稀土磷矿床的Sm-Nd同位素年龄及其地质意义

施春华^1,,
胡瑞忠²

1.
浙江林学院旅游与健康学院, 浙江临安 311300
2.
中国科学院地球化学研究所矿床地球化学国家重点实验室, 贵州贵阳 550002

基金项目:

中国科学院知识创新工程重要方向项目 KZCX3-SW-125

浙江林学院科学研究发展基金项目 2351000584

详细信息

作者简介:
施春华(1976-), 女, 目前主要从事旅游环境地球化学等教学与科研工作.E-mail: shichunhua7924@163.com

中图分类号: P597
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出版历程
- 收稿日期: 2007-05-25
- 刊出日期: 2008-03-25

Samarium-Neodymium Radiometric Dating and Its Geologic Implication of the Zhijin REE-Bearing Phosphorites, Guizhou Province, Southwest China

SHI Chun-hua^1
,,
HU Rui-zhong²

1.
School of Tour and Health, Zhejiang Forestry University, Linan 311300, China
2.
Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

摘要

摘要: 为探讨贵州织金含稀土磷矿床的形成时间和成矿物源, 利用Sm-Nd同位素稀释法对该矿床磷块岩中6个小壳化石及胶磷矿样品进行了年龄测定.样品的质谱分析测试结果显示, 样品的¹⁴⁷Sm/¹⁴⁴Nd与¹⁴³Nd/¹⁴⁴Nd构成了一条相关性良好的线性等时线; 计算结果表明织金含稀土磷矿床具有533±22Ma的Sm-Nd等时年龄, ε_Nd (t) 值为-2.44~-2.77, 表明它们具有相同的成因和相近的形成时代, 本次测得年龄代表着真实的成矿年龄; 二阶段Nd的模式年龄为1313~1338Ma.结合前人对该矿床稀土元素地球化学的研究成果表明, 织金含稀土磷矿床的成矿物源有新生地幔物质组分的加入.
- Sm-Nd同位素定年 /
- 含稀土磷矿床 /
- 贵州织金
Abstract: In order to discuss the age and the provenance of the Zhijin REE-bearing phosphorites in Guizhou, six small shell fossils and cellophane sampled from the phosphorites are dated by Sm-Nd isotopic dilution method.The results of mass spectrographic analysis show that the value of ¹⁴⁷Sm/¹⁴⁴Nd and ¹⁴³Nd/¹⁴⁴Nd formed an isochronal line.The test shows that the Sm-Nd isochronal dating of Zhijin REE-bearing phosphorites is 533±22 Ma (MSWD=1.1).The ε_Nd (t) of the samples are about-2.44 to-2.77, and the Nd two-stage model ages (T2DM) are 1 313-1 338 Ma.This result suggests that the samples have the same genesis and the approximative age, and the age represents the true mineralogenetic epoch.Combined with the REE geochemistry the juvenile mantle is responsible to the provenance of the Zhijin REE-bearing phosphorites.
- Sm-Nd isochron dating /
- REE-bearing phosphorite /
- Zhijin of Guizhou

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图 1 织金含稀土磷矿床地质简图及采样位置

1.三叠系; 2.二叠系; 3.石炭系; 4.寒武系明心寺组; 5.寒武系牛蹄塘组; 6.震旦系灯影组; 7.地层界线; 8.断层; 9.采样位置

Fig. 1. Geological sketch map of the Zhijin

下载: 全尺寸图片幻灯片

图 2 样品的Sm-Nd等时线

Fig. 2. Sm-Nd isochron for the sample

下载: 全尺寸图片幻灯片

表 1 样品的Sm、Nd同位素测定结果

Table 1. Sm, Nd isotopic compositions of samples

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