<em>In-situ</em> Micro-scale Pb Isotope Identification Characteristics of Metallogenic and Non-metallogenic Pyrites in Sandstone-type Uranium Deposits

ZHANG Xiaorui; WU Bailin; LEI Angui; YANG Songlin; YAO Luhang; PANG Kang; BAO Zhian; WANG Miao; HAO Xin; LIU Mingyi; LI Qi; LIN Zhouyang

doi:10.15898/j.cnki.11-2131/td.202111300192

Rock and Mineral Analysis > 2022 > 41(5): 717-732. > DOI: 10.15898/j.cnki.11-2131/td.202111300192

ZHANG Xiaorui, WU Bailin, LEI Angui, YANG Songlin, YAO Luhang, PANG Kang, BAO Zhian, WANG Miao, HAO Xin, LIU Mingyi, LI Qi, LIN Zhouyang. In-situ Micro-scale Pb Isotope Identification Characteristics of Metallogenic and Non-metallogenic Pyrites in Sandstone-type Uranium Deposits[J]. Rock and Mineral Analysis, 2022, 41(5): 717-732. DOI: 10.15898/j.cnki.11-2131/td.202111300192

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In-situ Micro-scale Pb Isotope Identification Characteristics of Metallogenic and Non-metallogenic Pyrites in Sandstone-type Uranium Deposits

1.
State Key Laboratory of Continental Dynamics; Department of Geology, Northwest University, Xi'an 710069, China
2.
Research Institute of Exploration and Development of Liaohe Oilfield, Panjin 124010, China

More Information

Received Date: November 29, 2021
Revised Date: February 17, 2022
Accepted Date: March 12, 2022
Available Online: November 10, 2022

Abstract

HIGHLIGHTS
(1) Pyrites of various types and formation stages in uranium ore were identified by electronic probes microanalysis.

(2) The non-traditional fs-LA-MC-ICP-MS method was used instead of the LA-MC-ICP-MS method to determine the Pb isotopic anomaly to identify the metallogenic pyrites.

(3) The pyrites in the metallogenic period were determined innovatively based on the data of ²⁰⁶Pb/²⁰⁴Pb, ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb combined with mineralogy characteristics.

ABSTRACT

BACKGROUND
Sandstone-type uranium deposits contain a large number of pyrites of different shapes and stages. It is difficult to accurately discriminate the pyrite formed before, during or after the metallogenic period solely by observation of pyrite morphology by mineralogy and electron probe microanalysis. Pyrites during the metallogenic period are important information carriers for the genesis and formation process of uranium deposits, and their accurate identification is of great significance. Previous studies both domestically and internationally have used the LA-MC-ICP-MS method to analyze Pb isotopes, but this method has low analytical precision for low-content Pb samples and it is difficult to obtain ²⁰⁴Pb data.
OBJECTIVES
To identify metallogenic and non-metallogenic pyrites by in situ micro-scale Pb isotopes.
METHODS
Femtosecond laser ablation multi-collector inductively coupled plasma-mass spectrometry (fs-LA-MC-ICP-MS) was used to determine the lead isotope of pyrite in uranium ores.
RESULTS
Under the mineralogy microscope, it is clear that the pyrite is related to mineralization and its ²⁰⁶Pb/²⁰⁴Pb ratio is more than ten times or even dozens of times larger than the normal Clark value. ²⁰⁷Pb/²⁰⁴Pb ratio is slightly different, and ²⁰⁸Pb/²⁰⁴Pb ratio is constant. The occurrence of strawberry-shaped pyrites, and non-metallogenic pyrites with uranium minerals growing around them but not interspersed, have normal a ²⁰⁶Pb/²⁰⁴Pb ratio. Pyrites without any contact relationship have no obvious regularity in its Pb isotopes.
CONCLUSIONS
In-situ micro-scale Pb isotopic difference of pyrites was combined with appropriate observation of mineralogy morphology and occurrence, resulting in pyrites in the metallogenic period being more accurately identified than previously.
- pyrites during metallogenic period,
- micro-area in-situ analysis,
- Pb isotope anomaly,
- U-Th-Pb,
- sandstone-type uranium deposit

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References (32)

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In-situ Micro-scale Pb Isotope Identification Characteristics of Metallogenic and Non-metallogenic Pyrites in Sandstone-type Uranium Deposits