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

Volume 33 Issue 2

Mar. 2008

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SHI Chun-hua, HU Rui-zhong, 2008. Samarium-Neodymium Radiometric Dating and Its Geologic Implication of the Zhijin REE-Bearing Phosphorites, Guizhou Province, Southwest China. Earth Science, 33(2): 205-209.

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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

Received Date: 2007-05-25
Publish Date: 2008-03-25

Abstract

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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References(46)

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

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