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Summary

This summary is machine-generated.

This study precisely dates the Jinchang gold deposit using 40Ar/39Ar dating of quartz, revealing a younger ore-forming age (107-110 Ma). This finding links gold mineralization to granite porphyry and supports a regional late Mesozoic event.

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Area of Science:

Economic Geology
Geochronology
Isotope Geochemistry

Background:

The Jinchang gold deposit's precise formation age remains debated despite extensive research.
Native gold in the deposit is primarily found as inclusions within pyrite and quartz.
Previous radiometric dating has not definitively resolved the timing of gold mineralization.

Purpose of the Study:

To resolve the timing and genesis of gold mineralization in the Jinchang gold deposit.
To apply 40Ar/39Ar dating on coeval quartz to determine precise formation ages.
To investigate the spatio-temporal relationship between gold mineralization and associated intrusions.

Main Methods:

Analysis of quartz crystals coeval with gold precipitation using the ArgusVI multi-collector noble gas mass spectrometer.
Application of the stepwise crushing technique for precise 40Ar/39Ar dating.
Dating of quartz samples from both breccia (J12Q) and vein (J18Q) ore types.

Main Results:

40Ar/39Ar plateau and inverse isochron ages for breccia ore quartz (J12Q) indicate an age of 109.87 ± 0.86/0.88 Ma.
40Ar/39Ar plateau and inverse isochron ages for vein ore quartz (J18Q) indicate a slightly younger age of 107.76 ± 0.85/0.92 Ma.
The determined ore-forming age range of 107–110 Ma is significantly younger than previously reported ages.

Conclusions:

The Jinchang gold deposit formed between 107–110 Ma, closely associated with granite porphyry intrusions.
This age aligns with the regional late Mesozoic porphyry-epithermal gold mineralization event in the Yanbian-Dongning area.
40Ar/39Ar dating of quartz is confirmed as a powerful tool for dating hydrothermal ore deposit formation.