Copper, gold and silver enrichment in ore mylonites within massive sulphide orebodies at Hongtoushan VHMS deposit, N.E. China

Gu, Ling; Zheng, Yuanchuan; Xiaoqian, Tang; Zaw, Khin; Della-Pasque, Fernando; Wu, Chunping; Tian, Zhonghua; Lu, Jianjun; Ni, Pei; Li, Xin; Yang, Futian; Wang, Xiangwen

doi:10.1016/j.oregeorev.2005.09.001

Cited by 58 publications

(44 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Deformation and metamorphism might have caused remobilization and enrichment of the ore elements (Marshall and Gilligan 1987) since primary ores were modified to mineralized tectonite to varying degrees or even to mineralized mylonite (Gu et al 2007). Despite the ubiquitous association of CO 2 with hydrothermal ore deposits, little is known about the role of CO 2 as a ligand or its direct participation in ore Note: 1) The numbers in brackets represent inclusion numbers; 2) L-Homogenized into liquid CO 2 ，V-Homogenized into gas CO 2 , C-Homogenized into critical point D r a f t III.…”

Section: The Contribution Of Carbonic Fluids To Gold Mineralizationmentioning

confidence: 99%

Carbonic fluids in the Hamadi gold deposit, Sudan: origin and contribution to gold mineralization

Cheng

Wang

et al. 2017

Can. J. Earth Sci.

View full text Add to dashboard Cite

The Hamadi gold deposit is located in North Sudan, and occurs in the Neoproterozoic metamorphic strata of the Arabian–Nubian Shield. Two types of gold mineralization can be discerned: gold-bearing quartz veins and altered rock ores near ductile shear zones. The gold-bearing quartz veins are composed of white to gray quartz associated with small amounts of pyrite and other polymetallic sulfide minerals. Wall-rock alterations include mainly beresitization, epidotization, chloritization, and carbonatization. CO2-rich inclusions are commonly seen in gold-bearing quartz veins and quartz veinlets from gold-bearing altered rocks; these include mainly one-phase carbonic (CO2 ± CH4 ± N2) inclusions and CO2–H2O inclusions with CO2/H2O volumetric ratios of 30% to ∼80%. Laser Raman analysis does not show the H2O peak in carbonic inclusions. In quartz veins, the melting temperature of solid CO2 (Tm,CO2) of carbonic inclusions has a narrow range of −59.6 to −56.8 °C. Carbonic inclusions also have CO2 partial homogenization temperatures (Th,CO2) of −28.3 to +23.7 °C, with most of the values clustering between +4.0 and +20 °C; all of these inclusions are homogenized into the liquid CO2 state. The densities range from 0.73 to 1.03 g/cm3. XCH4 of carbonic fluid inclusions ranges from 0.004 to 0.14, with most XCH4 around 0.05. In CO2–H2O fluid inclusions, Tm,CO2 values are recorded mostly at around −57.5 °C. The melting temperature of clathrate is 3.8–8.9 °C. It is suggested that the lowest trapping pressures of CO2 fluids would be 100 to ∼400 MPa, on the basis of the Th,CO2 of CO2-bearing one-phase (LCO2) inclusions and the total homogenization temperatures (Th,tot) of paragenetic CO2-bearing two-phase (LCO2–LH2O) inclusions. For altered rocks, the Tm,CO2 of the carbonic inclusions has a narrow range of −58.4 to ∼−57.0 °C, whereas the Th,CO2 varies widely (−19 to ∼+29 °C). Most carbonic inclusions and the carbonic phases in the CO2–H2O inclusions are homogenized to liquid CO2 phases, which correspond to densities of 0.70 to ∼1.00 g/cm3. Fluid inclusions in a single fluid inclusion assemblage (FIA) have narrow Tm,CO2 and Th,CO2 values, but they vary widely in different FIAs and non-FIAs, which indicates that there was a wide range of trapping pressure and temperature (P–T) conditions during the ore-forming process in late retrograde metamorphism after the metamorphism peak period. The carbonic inclusions in the Hamadi gold deposit are interpreted to have resulted from unmixing of an originally homogeneous aqueous–carbonic mixture during retrogress metamorphism caused by decreasing P–T conditions. CO2 contributed to gold mineralization by buffering the pH range and increasing the gold concentration in the fluids.

show abstract

Section: The Contribution Of Carbonic Fluids To Gold Mineralizationmentioning

confidence: 99%

Carbonic fluids in the Hamadi gold deposit, Sudan: origin and contribution to gold mineralization

Cheng

Wang

et al. 2017

Can. J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Deformation and metamorphism might have caused remobilization and enrichment of the ore elements (Marshall and Gilligan, 1987) since primary ores were modified to mineralized tectonite to varying degrees or even to mineralized mylonite (Gu et al, 2007). In fact, deformation and metamorphic textures are commonly observed in both the outcrops of ore deposits, as well as in thin sections.…”

Section: The Role Of Carbonic Fluids In Gold Mineralizationmentioning

confidence: 99%

CO 2 -rich inclusions in vein gold–copper mineralization of the Sarekoubu–Qiaxia District, southern Altaides, China: Implication for ore genesis

Yang

Xing

et al. 2015

Journal of Geochemical Exploration

View full text Add to dashboard Cite

“…1) (Gu et al, 2007(Gu et al, , 2001Zheng et al, 2011a, b). These three terranes are collectively termed the Qingyuan granite-greenstone terrane (Zhai et al, 1984;Zhang et al, 1984;Wan et al, 2005a;Zhang, 2010), the first Archean greenstone belt identified in China.…”

Section: Geological Settingmentioning

confidence: 99%

Metallogenic and Metamorphic Age of the Hongtoushan Copper–Zinc Massive Sulfide Deposit, Liaoning Province, China

et al. 2014

View full text Add to dashboard Cite

The Hongtoushan copper-zinc deposit is the only large Archean volcanogenic massive sulfide (VMS) deposit in China. This paper presents new information on the timing of metallogenesis and metamorphism of the deposit, including new cathodoluminescence (CL) images, and Th U −1 and LA-ICP-MS U-Pb dating on zircons of the biotite-plagioclase gneiss and plagioclase-amphibole gneiss that host the deposit. The CL images and Th U −1 ratios indicate that the zircons within the gneiss are of metamorphic origin. LA-ICP-MS dating of the plagioclase-amphibole gneiss yielded the upper intercept ages of 2549 Ma, and the biotiteplagioclase gneiss yielded the upper intercept ages of 2552 Ma and 2550 Ma correspondingly, indicating that the mineralization of the deposit occurred at around 2550 Ma. The rims of zircons within these host rocks yielded younger U-Pb ages at 2529, 2520 and 2515 Ma, identical to the age of felsic intrusive rocks in the study area. This suggests that the Hongtoushan VMS deposit underwent initial metamorphism and deformation at around 2520 Ma by the intrusion of granite magmas.

show abstract

Copper, gold and silver enrichment in ore mylonites within massive sulphide orebodies at Hongtoushan VHMS deposit, N.E. China

Cited by 58 publications

References 103 publications

Carbonic fluids in the Hamadi gold deposit, Sudan: origin and contribution to gold mineralization

Carbonic fluids in the Hamadi gold deposit, Sudan: origin and contribution to gold mineralization

CO 2 -rich inclusions in vein gold–copper mineralization of the Sarekoubu–Qiaxia District, southern Altaides, China: Implication for ore genesis

Metallogenic and Metamorphic Age of the Hongtoushan Copper–Zinc Massive Sulfide Deposit, Liaoning Province, China

Contact Info

Product

Resources

About