Cassiterite U-Pb Dating with LA-MC-ICP-MS of the Laozhailing Cu-Sn Deposit, Yongzhou City, Hunan Province

CUI Yurong; YANG Jun; TU Jiarun; XIAO Zhibin; ZHOU Hongying; YU Guangming; CUI Minli; LIU Jiufen

doi:10.15898/j.ykcs.202402290025

Rock and Mineral Analysis > 2024 > 43(6): 880-891. > DOI: 10.15898/j.ykcs.202402290025

CUI Yurong，YANG Jun，TU Jiarun，et al. Cassiterite U-Pb Dating with LA-MC-ICP-MS of the Laozhailing Cu-Sn Deposit, Yongzhou City, Hunan Province[J]. Rock and Mineral Analysis，2024，43（6）：880−891. DOI: 10.15898/j.ykcs.202402290025

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Cassiterite U-Pb Dating with LA-MC-ICP-MS of the Laozhailing Cu-Sn Deposit, Yongzhou City, Hunan Province

1.
Command Center for Natural Resources Comprehensive Survey, China Geological Survey, Beijing 100055, China
2.
Tianjin Center, China Geological Survey, Tianjin 300170, China
3.
China University of Petroleum (East China), Qingdao 266580, China

More Information

Received Date: February 28, 2024
Revised Date: October 09, 2024
Accepted Date: November 03, 2024
Available Online: November 24, 2024
Published Date: November 14, 2024

Abstract

HIGHLIGHTS
(1) The mineralization age of quartz-greisen vein in Laozhailing can be accurately constrained by the cassiterite U-Pb dating method with LA-MC-ICP-MS.

(2) Cassiterite of the Laozhailing Cu-Sn deposit is mostly characterized by euhedral to subhedral granular or columnar, with small grain size. Sample points selected are all greater than 100μm to ensure the reliability of the test data. The results indicate that the mineralization age of the Laozhailing Cu-Sn deposit is about 220Ma, which formed in the late Indosinian period.

(3) The mineralization age of the Laozhailing Cu-Sn deposit was close to the emplacement of the Yangmingshan granites, indicating a continuous process of diagenesis and mineralization. This provides important chronological evidence for the magmatic hydrothermal genesis of the Laozhailing Cu-Sn deposit.

ABSTRACT

Cassiterite is an important ore mineral in tin polymetallic deposits. Using cassiterite for dating tin polymetallic deposits has become one of the most direct methods to obtain the mineralization age of the deposits. However, due to the low uranium content and high common lead characteristics of cassiterite, the main problems and technical difficulties of the in situ U-Pb dating method for cassiterite lie in the development of ideal standards and the accuracy of common lead correction. The mineralization age of the Laozhailing Cu-Sn deposit in Yongzhou City, Hunan Province is constrained here by optimizing the technology. The Laozhailing Cu-Sn deposit is a vein-type tin polymetallic deposit, which is mainly composed of tin-quartz veins, cataclastic greisenized granite, and greisen. Three samples, 16LZ01, 16LZ02, and 16LZ03, were obtained with Tera-Wasserburg U-Pb lower intersection ages of 222.0±1.5Ma (MSWD=1.6, n=37), 220.5±3.5Ma (MSWD=2.9, n=28), and 225.0±1.6Ma (MSWD=1.3, n=31), respectively. These results indicate mineralization in the late Indosinian period. The mineralization of the Laozhailing Cu-Sn deposit is closely related to the magmatic hydrothermal activity of the Yangmingshan complex granites. The results of this study provide important chronological evidence for the magmatic hydrothermal origin of the Laozhailing Cu-Sn deposit.
- Cu-Sn deposit,
- cassiterite U-Pb dating,
- LA-MC-ICP-MS,
- Laozhailing,
- Hunan

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References (36)

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