Journal ArticleDOI
Geology, fluid inclusion, and isotope constraints on ore genesis of the Neoproterozoic Jinshan orogenic gold deposit, South China
Chao Zhao,Pei Ni,Guo-Guang Wang,Jun-Ying Ding,Hui Chen,Kui-Dong Zhao,Yi-Tao Cai,Ying-Feng Xu +7 more
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TLDR
The Jinshan gold deposit is located in the Neoproterozoic Jiangnan orogen between the Yangtze and Cathaysia blocks, and fluid-inclusion studies were conducted on the quartz veins as discussed by the authors.Abstract:
The Jinshan gold deposit is located in the Neoproterozoic Jiangnan orogen between the Yangtze and Cathaysia blocks. Gold-bearing disseminated ores are associated with the earlier stage of NWW-trending ductile zone, and auriferous quartz vein-type ores show an intimate relationship with the later stage of NE-trending brittle-ductile zones. Fluid-inclusion studies were conducted on the quartz veins. Three types of fluid inclusions can be identified: H2O–CO2 inclusions (type I), CO2-rich inclusions (type II), and aqueous inclusions (type III). The pre-ore stage, quartz-pyrite veins primarily contain type I inclusions with constant CO2 bubble volumetric proportions. The main gold mineralization-stage veins have all three types of inclusions with variable gas-phase ratios and CO2 contents. The post-ore stage carbonate±chlorite veinlets only contain type III inclusions. Type I inclusions in the pre-ore stage display homogenization temperatures (Th) of 285–340°C, with salinities of 1.4–6.1 wt.% NaCl equivalent. In the main gold mineralization stage, type II and III inclusions show similar Th at 208–277°C, but contrasting salinity values with 0.6–3.6 and 3.5–8.9 wt.% NaCl equivalent, and type I inclusions show variable CO2-phase proportions and have Th of 241–292°C and salinities of 1.0–7.0 wt.% NaCl equivalent. In the post-ore stage, type III inclusions yield Th of 109–201°C and salinities of 1.1–6.4 wt.% NaCl equivalent. Petrological observations and microthermometric results show that fluid immiscibility primarily occurred during the gold mineralization stages. The oxygen and hydrogen isotope compositions (δ18 O = +6.9‰ to +11.2‰, δD = −71‰ to −46‰) of inclusion water in quartz grains imply that ore fluids were principally metamorphic in origin. The sulfur and lead values of sulfide from the ores are analogous to those from the basement strata, suggesting a predominantly crustal source of the ore sulfides. The Jinshan deposit is a typical orogenic gold deposit.read more
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Gold mineralization in China: Metallogenic provinces, deposit types and tectonic framework
Jun Deng,Qingfei Wang +1 more
TL;DR: A review of major gold mineralization events in China and a summary of metallogenic provinces, deposit types, metallogen epochs and tectonic settings are presented in this paper.
Journal ArticleDOI
An infrared microthermometric study of fluid inclusions in coexisting quartz and wolframite from Late Mesozoic tungsten deposits in the Gannan metallogenic belt, South China
TL;DR: In this article, the homogenization temperatures of two-phase aqueous inclusions (type Iw) in wolframite from all of these deposits show a clearly decreasing trend with constant salinities, implying a simple cooling process.
Journal ArticleDOI
Gold mineralization in the Jiangnan Orogenic Belt of South China: Geological, geochemical and geochronological characteristics, ore deposit-type and geodynamic setting
Deru Xu,Deru Xu,Teng Deng,Teng Deng,Guoxiang Chi,Zhilin Wang,Fenghui Zou,Junling Zhang,Shaohao Zou +8 more
TL;DR: The Jiangnan Orogenic Belt (JOB) contains a number of gold (Au) (-polymetallic) ore deposits and mineral showings, mostly hosted by Neoproterozoic low-grade metamorphic volcaniclastic and sedimentary rocks as discussed by the authors.
Journal ArticleDOI
An Early Paleozoic orogenic gold belt along the Jiang−Shao Fault, South China: Evidence from fluid inclusions and Rb–Sr dating of quartz in the Huangshan and Pingshui deposits
Pei Ni,Guo-Guang Wang,Hui Chen,Hui Chen,Ying-Feng Xu,Shen-Jin Guan,Shen-Jin Guan,Jun-Yi Pan,Lin Li +8 more
TL;DR: There are several gold deposits in the eastern section of the regional Jiang−Shao Fault between the Yangtze and Cathaysia Blocks in South China as mentioned in this paper, which are strictly hosted in second-order NE-trending ductile shear zones.
Journal ArticleDOI
Geology, geochronology, geochemistry and ore genesis of the Wangu gold deposit in northeastern Hunan Province, Jiangnan Orogen, South China
Teng Deng,Teng Deng,Deru Xu,Guoxiang Chi,Zhilin Wang,Qianqian Jiao,Juntao Ning,Guojun Dong,Fenghui Zou +8 more
TL;DR: The Wangu gold deposit in northeastern Hunan, South China, is one of many structurally controlled gold deposits in the Jiangnan Orogen as mentioned in this paper, but the timing of mineralization, tectonic setting and ore genesis of this deposit and many similar deposits in this deposit are not well understood.
References
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Plumbotectonics-the model
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TL;DR: Plumbotectonics is an attempt to model the geochemical behaviour of U, Th and Pb, among major terrestrial reservoirs in agreement with observational data as discussed by the authors, by recycling rock through the orogenic environment, a dynamically communicating upper crust, lower crust, and mantle can produce the required patterns of lead-isotope evolution.