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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Determination of age and source constraints for the Bake quartz vein-type gold deposit in SE Guizhou using arsenopyrite Re-Os chronology and REE characteristics

Jiasheng Wang, Hanjie Wen, Chao Li, Xiaojun Jiang, Chuanwei Zhu, Shengjiang Du, Lei Zhang
Geochemical Journal, Vol. 49, No. , P. 73-81, 2015

ABSTRACT

The Bake quartz vein-type gold deposit is one of the most well-known gold deposits in SE Guizhou. The mineralization age of auriferous arsenopyrite determined using Re-Os chronology is 412 ± 21 Ma (MSWD = 2.6), which is in good agreement with the regional-scale geologic evidence and confirms that the Caledonian was an important gold metallogenetic period in the Xuefeng region. Contrastingly, the high initial 187Os/188Os ratio (2.7 ± 1.2) suggests a crustal source for the ore-forming material of the deposit. Furthermore, the REE patterns, Eu/Eu*, Ce/Ce* and Y/Ho ratios of the arsenopyrites are all similar to those of the wall rocks, indicating that the ore was perhaps derived from the wall rocks belonging to the Xiajiang Group.

KEYWORDS

Re-Os, REE, arsenopyrite, Bake, quartz vein-type gold deposit

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