Oxygen fugacity of Yanshanian granites in South China and implications for metallogeny

Li, Xingyuan; Chi, Guoxiang; Zhou, Yongzhang; Deng, Teng; Zhang, Jingru

doi:10.1016/j.oregeorev.2017.02.002

Cited by 56 publications

(29 citation statements)

References 70 publications

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“…Using the model proposed by [83], we also estimate the redox conditions for the samples 19-4s1 and 24-15s1 (Table S2 of Supplementary Materials), yielding the relatively low oxygen fugacities with log f O 2 values ranging from −19 to −15 (mean = −17) and from −19 to −13 (mean = −15), respectively. This data further confirmed that both the Indosinian and Yanshanian hydrothermal fluids are reducing fluids which are favorable for the W-Sn mineralization [88][89][90][91]. …”

Section: Physico-chemical Conditions Of the Ore-forming Fluidssupporting

confidence: 70%

Geochronology and Genesis of the Xitian W-Sn Polymetallic Deposit in Eastern Hunan Province, South China: Evidence from Zircon U-Pb and Muscovite Ar-Ar Dating, Petrochemistry, and Wolframite Sr-Nd-Pb Isotopes

Cao

Yang

et al. 2018

Minerals

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Abstract:The recently explored Xitian tungsten-tin (W-Sn) polymetallic ore field, located in Hunan province, South China, is one of the largest ore fields in the Nanling Range (NLR). Two major metallogenic types appeared in this ore field, skarn-and quartz vein-type. They are distributed within Longshang, Heshuxia, Shaiheling, Hejiangkou, Goudalan, and so on. Hydrothermal zircons from two altered granites yielded U-Pb ages of 152.8 ± 1.1 Ma, and 226.0 ± 2.8 Ma, respectively. Two muscovite samples from ore-bearing quartz vein yielded 40 Ar/ 39 Ar plateau ages of 156.6 ± 0.7 Ma, 149.5 ± 0.8 Ma, respectively. Combined with the geological evidence, two metallogenic events are proposed in the Xitian ore field, with skarn-type W-Sn mineralization in Late Triassic (Indosinian) and quartz vein/greisen type W-Sn mineralization in Late Jurassic (Yanshanian). The relatively low Ce/Ce* ratios and high Y/Ho ratios in zircons from two altered granites indicate that the hydrothermal fluids of two metallogenic events are characterized by low oxygen fugacities and enrichment in F. The similar chondrite-normalized patterns between the skarn and Xitian Indosinian granites and Sr-Nd-Pb isotopic compositions of wolframite suggest that the metal sources for both types W-Sn mineralization are derived from a crustal source.

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Section: Physico-chemical Conditions Of the Ore-forming Fluidssupporting

confidence: 70%

Geochronology and Genesis of the Xitian W-Sn Polymetallic Deposit in Eastern Hunan Province, South China: Evidence from Zircon U-Pb and Muscovite Ar-Ar Dating, Petrochemistry, and Wolframite Sr-Nd-Pb Isotopes

Cao

Yang

et al. 2018

Minerals

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“…6), indicating that the Weibao Cu-Pb-Zn skarn deposit has much lower oxygen fugacity than porphyry Cu deposits. By examining the relationships between the oxygen fugacity and mineralization associated with Yanshanian granites in South China, Li et al (2017b) also found that the granites related to Cu-Pb-Zn mineralization had distinctly lower oxygen fugacity than those related to porphyry Cu-(Au)-Mo mineralization. Li et al (2008) proposed that the lower oxygen fugacity of magmas in Cu-Pb-Zn skarn deposits might result from assimilation of crustal materials.…”

Section: Contrasts In Magmatic Oxygen Fugacitymentioning

confidence: 97%

“…There is a consensus that oxidized magmas are more favorable than reduced magmas in generating porphyry Cu deposits (Imai 2002;Liang et al 2006;Lu et al 2016;Li et al 2017a), considering that at higher oxygen fugacity, magmatic sulfur exists mainly as sulfate (SO 4 2− ) which has a much higher solubility in silicate melts than sulfide and will tend to delay or even prevent saturation of a magmatic sulfide phase (Ballard et al 2002;Richards 2003). When it comes to Cu (-Pb-Zn) skarn deposits, this is also applicable because of the similar magmatic origins and evolutions of porphyry and skarn deposits (Li et al 2017b). …”

Section: Magmatic Oxygen Fugacitymentioning

confidence: 99%

Geochemical contrasts between Late Triassic ore-bearing and barren intrusions in the Weibao Cu–Pb–Zn deposit, East Kunlun Mountains, NW China: constraints from accessory minerals (zircon and apatite)

et al. 2017

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The Weibao copper-lead-zinc skarn deposit is located in the northern East Kunlun terrane, NW China. Igneous intrusions in this deposit consist of barren diorite porphyry (U-Pb zircon age of 232.0 ± 2.0 Ma) and ore-bearing quartz diorite and pyroxene diorite (U-Pb zircon ages of 223.3 ± 1.5 and 224.6 ± 2.9 Ma, respectively). Whole-rock major and trace element and accessory mineral (zircon and apatite) composition from these intrusions are studied to examine the different geochemical characteristics of orebearing and barren intrusions. Compared to the barren diorite porphyry, the ore-bearing intrusions have higher Ce 4+ /Ce 3+ ratios of zircon and lower Mn contents of apatite, indicating higher oxidation state. Besides, apatite from the ore-bearing intrusions shows higher Cl contents and lower F/Cl ratios. These characteristics collectively suggest the higher productivity of ore-bearing quartz diorite and pyroxene diorite. When compared with ore-bearing intrusions from global porphyry Cu deposits, those from Cu-Pb-Zn skarn deposits display lower Ce 4+ /Ce 3+ and Eu N /Eu N * ratios of zircon and lower Cl and higher F/Cl ratios of apatite. We conclude that these differences reflect a general geochemical feature, and that zircon and apatite composition is a sensitive tool to infer economic potential of magmas and the resulting mineralization types in intrusion-related exploration targets.

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“…During the Upper Mesozoic, acid intrusions broke up the sedimentary succession. This regional event produced the Yanshanian granite (Figure a) that characterizes the entire southern‐eastern China from Hainan to Fujian Province (Li and Li ; Zhang et al ; Li et al ). Younger deposits consist of Plio‐Quaternary alluvial to shallow marine sequences (GBGP ) that crop out along the river valleys and along the coastal sector (Figure b).…”

Section: Regional Hydrogeologymentioning

confidence: 99%

Groundwater Complexity in Urban Catchments: Shenzhen, Southern China

Lancia

Chen

et al. 2019

Groundwater

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Groundwater interactions with surface water and sewers in an urban setting are complex, and classic hydrogeological approaches must be combined with anthropogenic elements to characterize them. The level of detail needed to understand these interactions is illustrated by the analysis of an urban subcatchment in the megacity of Shenzhen in southern China that has had a drastic urban expansion in the last 40 years. The study area is characterized by the Yanshanian granite that is widespread across southern-eastern China. The urban setting is studied using multitemporal analysis of satellite images, borehole investigations and field surveys. Given the local hydrostratigraphy, a conceptual model was developed to identify the physical and anthropogenic factors that regulate the urban groundwater system. Based on the conceptual model and the data collected from the field or compiled from the literature, the average annual effective recharge is estimated to be 290 mm/year, after the urbanization process. From rural to urban conditions, it is estimated that the effective recharge increased by 170% and sewers intercept at least 23% of the effective recharge. Groundwater captured by sewers reduces river flows and increases the required capacity and costs for waste water treatment plants.

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Oxygen fugacity of Yanshanian granites in South China and implications for metallogeny

Cited by 56 publications

References 70 publications

Geochronology and Genesis of the Xitian W-Sn Polymetallic Deposit in Eastern Hunan Province, South China: Evidence from Zircon U-Pb and Muscovite Ar-Ar Dating, Petrochemistry, and Wolframite Sr-Nd-Pb Isotopes

Geochronology and Genesis of the Xitian W-Sn Polymetallic Deposit in Eastern Hunan Province, South China: Evidence from Zircon U-Pb and Muscovite Ar-Ar Dating, Petrochemistry, and Wolframite Sr-Nd-Pb Isotopes

Geochemical contrasts between Late Triassic ore-bearing and barren intrusions in the Weibao Cu–Pb–Zn deposit, East Kunlun Mountains, NW China: constraints from accessory minerals (zircon and apatite)

Groundwater Complexity in Urban Catchments: Shenzhen, Southern China

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