ESR Dating of Quartz from Linxi Fluorite Deposits, Inner Mongolia and Its Geological Implications

Abstract

Abstract:

The Linxi fluorite deposits, Inner Mongolia, are mainly hosted in the vocanic-sedimentary stratum and acidic intrusions in the Late Paleozoic-Mesozoic, controlled by the NS and the NNE trending fault zone. Quartzs (quartz vein) are massively formed within the same period in the deposit. The ESR dating was used to study the fluorite-forming time by measuring the 8 pieces of paragenetic quartz samples in the deposits. The results show that the ESR dating of quartzs from Linxi fluorite deposits ranges from 126.6 to 157.3 Ma, with an average of 137 Ma, indicating that the metallogenic hydrothermal fluid mainly formed in the Late Jurassic-Early Cretaceous. Combined with geological characteristics of deposits and the global fluorite deposits, Linxi fluorite deposits are of hydrothermal origin, and of fracture-filled metasomatic type, which are formed in the conversion period of the middle Yanshanian stage intraplate tectonic regime.

Key words: Linxi, Inner Mongolia, fluorite deposit, ESR dating, genesis of deposi

CLC Number:

CAO Hua-wen, ZHANG Shou-ting, ZOU Hao, FANG Yi, ZHANG Peng, WANG Guang-kai. ESR Dating of Quartz from Linxi Fluorite Deposits, Inner Mongolia and Its Geological Implications[J]. Geoscience, 2013, 27(4): 888-894.

References

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