Ore genesis of the Bake gold deposit, southeastern Guizhou province, China: Constraints from mineralogy, in-situ trace element and sulfur isotope analysis of pyrite

Liu, An Lu; Jiang, Man; Ulrich, Thomas; Zhang, Jun; Zhang, Xiao Jun

doi:10.1016/j.oregeorev.2018.09.018

Cited by 9 publications

(17 citation statements)

References 72 publications

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“…The gangue minerals include quartz, calcite, mica, and chlorite. In general, similar to those gold deposits in this region, hydrothermal alteration of the Chaoyangzhai gold deposit is subtle, and it mainly consists of silicification and carbonatization [7][8][9].…”

Section: Ore Deposit Geologymentioning

confidence: 77%

“…The western part is characterized by gold mineralization that is related to the orogeny, whereas the eastern part is famous for tungsten polymetallic mineralization related to the Yanshanian magmatism [7,10,[19][20][21][22]. The Southeast Guizhou, which is located at the western part of the Jiangnan Orogenic Belt, is famous for the intense gold mineralization and it is one of the important gold producers in China [7][8][9][10]23,24]. The stratigraphic sequences of this area consist of the Neoproterozoic Xiajiang Group (also named Banxi Group in Hunan Province), Sinian, Carboniferous, Permian, Jurassic, Cretaceous, and Quaternary units ( Figure 1b).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Longli Formation, with a thickness of 1300-1700 m, is mainly composed of blastopsammite, intercalated with blastopsephitic siltstone, blastopsephitic arkose, and silty sericite slate; The Pinglue Formation (1500-2000 m thick) is mainly composed of sericite slate of silty slate, which is intercalated with a few tuffaceous slate and blastopsammite; The Qingshuijiang Formation (2300-3700 m thick) is mainly composed of bluish or gray, thin to medium banded tuffaceous slate, and laminated medium to thick tuff; The Fanzhao Formation (> 1000 m thick) can be subdivided into an Upper Formation and a Lower Formation, which comprise tuffaceous slate and blastopsammite, intercalated with banded tuff, and gray slate, intercalated with blastopsammite, respectively. [8,26]).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Southeast Guizhou province is one of the significant gold producers in China, and numerous small-to large-sized gold deposits were explored in this region [7][8][9][10]17,31]. These deposits share the common feature that the quartz vein type ore bodies occur in Neoproterozoic epimetamorphic rocks [8][9][10]23]. In addition, these rocks mainly belong to the Neoproterozoic Xiajiang Group, which consists of the Longli, Pinglue, Qingshuijiang, and Fanzhao Formations.…”

Section: Age and Source Of Rocks From Qingshuijiang Formationmentioning

confidence: 99%

“…In addition, these gold deposits often appear in groups and/or belts, which are characterized by abundant gold resources and reserves. Examples include Hill End in central New South Wales, [8,16]); (b) Geological map of the western part of Jiangnan Orogenic Belt, showing the location of Precambrian rocks, granitic intrusions and gold deposits (modified from [8,17]).…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Ore Deposit Geologymentioning

confidence: 77%