Sulfur- and lead-isotope signatures of orogenic gold mineralisation associated with the Hill End Trough, Lachlan Orogen, New South Wales, Australia

Downes, Peter M.; Seccombe, P. K.; Carr, Graham R.

doi:10.1007/s00710-008-0012-7

Cited by 8 publications

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In situ sulfur isotope analyses have been widely used in economic geology, because they can provide added evidence regarding the source of deposits [38,39,54,55]. Based on the occurrence of arsenopyrite and pyrite and the absence of magnetite and/or sulfates in the quartz vein type ore bodies, we proposed that the ore-forming fluid were reduced and the sulfur isotopic compositions of the sulfides reflects that of the ore-forming fluid system [57,58]. As shown in Table S4, the δ 34 S V -CDT values of pyrite and arsenopyrite range from +8.12% to +9.99% and from +9.78 to +10.78% , respectively, which is consistent with the δ 34 S V -CDT values of the epimetamorphic rocks of the Neoproterozoic Qingshuijiang Formation (+9.27% to +12.44% ), as reported by [8].…”

Section: Source Of the Sulfur And Goldmentioning

confidence: 98%

Source of the Chaoyangzhai Gold Deposit, Southeast Guizhou: Constraints from LA-ICP-MS Zircon U–Pb Dating, Whole-rock Geochemistry and In Situ Sulfur Isotopes

2019

View full text Add to dashboard Cite

The Chaoyangzhai gold deposit is one of the newly discovered medium to large scale turbidite-hosted gold deposits in Southeast Guizhou, South China. In this study, laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) zircon U–Pb dating on the tuffaceous- and sandy-slates of Qingshuijiang Formation, Xiajiang Group, and gold-bearing quartz vein yielded similar age distributions, indicating that zircon grains in gold-bearing quartz vein originated from the surrounding tuffaceous- and sandy-slates. In addition, the youngest weighted mean ages of the zircon grains from the tuffaceous- and sandy-slates were 775 ± 13 Ma and 777 ± 16 Ma, respectively, displaying that the tuffaceous- and sandy-slates of the Qingshuijiang Formation were likely deposited in Neoproterozoic. Based on their major and trace element compositions, the tuffaceous- and sandy-slates were sourced from a felsic igneous provenance. The sandy slates have higher contents of Au (mostly ranging from 0.019 to 0.252 ppm), than those of the tuffaceous slates (mostly lower than 0.005 ppm). The δ34SV-CDT values of pyrite and arsenopyrite of the gold-bearing samples range from +8.12‰ to +9.99‰ and from +9.78 to +10.78‰, respectively, indicating that the sulfur source was from the metamorphic rocks. Together with the evidence of similar geochemical patterns between the tuffaceous- and sandy-slates and gold-bearing quartz, it is proposed that the gold might be mainly sourced from sandy slates. The metamorphic devolatilization, which was caused by the Caledonian orogeny (Xuefeng Orogenic Event), resulted in the formation of the ore-forming fluid. Gold was likely deposited in the fractures due to changes of the physico-chemical conditions, leading to the formation of the Chaoyangzhai gold deposit, and the large-scale gold mineralization in Southeast Guizhou.

show abstract