Geochemical characteristics of biotite from felsic intrusive rocks around the Sisson Brook W–Mo–Cu deposit, west-central New Brunswick: An indicator of halogen and oxygen fugacity of magmatic systems

Zhang, Wei; Lentz, David R.; Thorne, Kathleen G.; McFarlane, Christopher R.M.

doi:10.1016/j.oregeorev.2016.02.004

Cited by 67 publications

(32 citation statements)

References 81 publications

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“…Lu et al [14] suggested that the fertile magmas commonly contain high (Ce/Nd)/Y and high Eu N /Eu N * ratios. However, Eu N /Eu N * of zircon grain is also dependent on the magma oxidation state [5,31,40,46]. In this study, the lack of positive Ce N /Ce N * vs. Eu N /Eu N * correlation, and the presence of positive Eu N /Eu N * vs. (Ce/Nd)/Y correlation suggest that Eu N /Eu N * is probably affected by water content (Figures 6c and 7a).…”

Section: Magma Water Contentmentioning

confidence: 49%

“…It was interpreted that "wet" magmas can suppress early plagioclase crystallization, which causes the low Dy/Yb and high Eu N /Eu N * ratios. However, the Eu N /Eu N * ratios in zircon not only vary with water content but also with the redox state [14,34,[45][46][47]. Hence, in this study, (Ce/Nd)/Y and Eu N /Eu N * ratios are both selected as proxies for the water content of magma.…”

Section: Water Content Estimationmentioning

confidence: 99%

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Copper Mineralization Potential of Late Triassic Granitoids in Northern Yidun Arc, SW China

Zhang

Song

et al. 2019

Minerals

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Yidun arc is an important constituent of the Sanjiang Tethyan Domain in SW China. The Changdagou pluton, located in the northern part of the Yidun Arc, mainly consists of granodiorite. In this study, we conducted in-situ LA-ICP-MS zircon U-Pb dating, and trace element and Hf isotope analyses on the Changdagou granites. Age dating results yielded a weighted mean U-Pb age of 214.97 ± 0.98 Ma (MSWD = 1.2, 2σ), broadly coeval with extensive late Triassic magmatism across the Yidun Arc. All zircon grains analyzed showed high concentrations of Th, U, and HREE, with positive Ce and negative Eu anomalies. Logfo2 and CeN/CeN* values vary from FMQ −3.14 to FMQ +7.44 (average FMQ +3.98), and 14 to 172 (avg. 98), respectively. The zircon EuN/EuN* (avg. 0.22) ratios have no clear correlation with the CeN/CeN* ratios, suggesting that the former were mainly affected by the magma water content. In addition, zircon εHf(t) values vary in a narrow range (–2.9 to −4.9, avg. −3.4) that clusters around zero, indicating a greater component of mantle-derived magma. Hence, we propose that the Changdagou granodiorite was derived from a highly oxidized, “wet”, Cu-rich source, of the type likely to generate porphyry Cu mineralization. However, these parameters (logfO2, EuN/EuN*, (Ce/Nd)/Y, and εHf(t)) are all lower than those of intrusions associated with Cu ores at Pulang and Lannitang, which may explain why the Cu deposit discovered at Changdagou is small by comparison. Furthermore, on the basis of the decreasing trends of εHf, logfO2, and H2O content from south to north along the Yiduan arc, we infer that the northern segment of the Yidun arc (including Changdagou) was located further away from the subduction front.

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Section: Magma Water Contentmentioning

confidence: 49%

Section: Water Content Estimationmentioning

confidence: 99%

Copper Mineralization Potential of Late Triassic Granitoids in Northern Yidun Arc, SW China

Zhang

Song

et al. 2019

Minerals

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“…Based on analysis of the composition of the different types and stages of biotite and apatite, we can invert the changes in the physical and chemical conditions, such as the temperature, oxygen fugacity, and halogen fugacity, in the magmatic and hydrothermal stages (Bao et al, ; Jin et al, ; Li et al, ; Mao et al, ; Parsapoor et al, ; Smith, ; Xiao et al, ; Xing et al, ; Yuan et al, ; Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Biotite and apatite are common minerals in magmatic rocks, both of which can form during either magmatic or hydrothermal processes. By using the chemical composition of different genetic types of biotite, the changes in the physical and chemical conditions in the magmatic‐hydrothermal system during the mineralization of porphyry deposits can be revealed (e.g., Bao, Webster, Zhang, Goldoff, & Zhang, ; Jin, Gao, Chen, & Zhao, ; Mao, Zhong, Zhu, Lin, & Zhao, ; Parsapoor, Khalili, Tepley, & Maghami, ; Xiao et al, ; Xing, Shu, Zhao, & Xu, ; Zhang, Lentz, Thorne, & McFarlane, ). In addition, by using the chemical composition of different genetic types of apatite, the hydrothermal interaction mechanisms in the mineralization of the Kiruna‐type and iron oxide‐(Cu–Au) deposit style (IOCG) deposits can be constrained (e.g., Bonyadi, Davidson, Mehrabi, Meffre, & Ghazban, ; Harlov et al, ; Heidarian, Lentz, Alirezaei, McFarlane, & Peighambari, ; Krneta, Ciobanu, Cook, Ehrig, & Kontonikas‐Charos, ; Taghipour, Kananian, Harlov, & Oberhänsli, ; Torab & Lehmann, ; Zeng, Zhao, Li, Hu, & McFarlane, ).…”

Section: Introductionmentioning

confidence: 99%

Mineralogical constraints on Nb–REE mineralization of the Zhujiayuan Nb (−REE) deposit in the North Daba Mountain, South Qinling, China

et al. 2019

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The trachyte-hosted Zhujiayuan deposit is located in the North Daba Mountain of South Qinling, China. In this deposit, the presence of different stages and genetic types of biotite, apatite, and rutile make it an excellent locality to constrain the mineralization process of Nb-REE in the alkaline igneous rock. In this study, supported by electron probe microanalyzer (EPMA), chemical analyses of biotite, apatite, rutile, columbite-group minerals, fersmite, monazite, and aeschynite-group minerals were presented. Three types of biotite were identified, including magmatic (Bt-1), reequilibrated (Bt-2), and hydrothermal biotite (Bt-3). Apatite can be divided into two types: magmatic (Ap-1) and hydrothermal apatite (Ap-2). Rutile can also be divided into two types: magmatic (Rt-1) and hydrothermal rutile (Rt-2). Rt-1 and Ap-1 contain average 1.44 wt% Nb 2 O 5 and 4.14 wt% LRE 2 O 3 , respectively, indicating that certain concentrations of Nb and REE were incorporated into the rutile and apatite, respectively, during the magmatic crystallization process. The distributions of the columbite-group, fersmite, monazite, and aeschynite-group minerals, as well as the compositional characteristics of monazite, indicate the important role of hydrothermal metasomatism during Nb-REE mineralization. The compositional characteristics of Bt-2 indicate relatively high F and Cl fugacities in the hydrothermal fluid. Bt-2 and Bt-3 both have higher Nb 2 O 5 content than Bt-1, indicating a higher Nb content in the fluid. The source of fluidic Nb likely derived from the metasomatism of magmatic rutile. The REE content decreased from Ap-1 to Ap-2, possibly due to a dissolutionreprecipitation process. The compositional changes from Bt-1 to Bt-3 and Ap-1 to Ap-2 also revealed a decrease in temperature, increase in oxygen fugacity, and increase in Ca content from the magmatic to the hydrothermal system. We speculate that rutile and apatite may have originally formed from an Nb-REE-rich alkalinesilicate melt derived from the metasomatized mantle, which led to the initial Nb-REE enrichment. Subsequent hydrothermal alteration by hydrothermal fluids rich in F and Cl, accompanied by changes in the above physical and chemical conditions and fluid composition, caused a relatively limited and localized remobilization of Nb-REE into the fractures and vesicles in the trachyte.

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“…Our knowledge of the HF, HCl, and H 2 O fugacity of hydrothermal fluids associated with porphyry Cu mineralization and hydrothermal alteration is based on limited published thermodynamic data (Parry and Jacobs, 1975;Parry et al, 1978;Munoz and Swenson, 1981;Munoz, 1984;Loferski and Ayuso, 1995). Presently, there are several studies dealing with mineral chemistry of hydrothermal biotite from numerous porphyry copper deposits worldwide, such as Kahang deposit, Iran (Afshooni et al, 2013), Lar deposit, Iran (Moradi et al, 2016), Dexing deposit, China (Bao et al, 2016), and Sisson Brook deposit, New Brunswick, Canada (Zhang et al, 2016). Halogen chemistry of magmatic biotite within the mineralization-bearing tonalite porphyry in Batu Hijau deposit, Indonesia, was described by Idrus et al (2007).…”

Section: Introductionmentioning

confidence: 99%

Petrography and Mineral Chemistry of Magmatic and Hydrothermal Biotite in Porphyry Copper-Gold Deposits: A Tool for Understanding Mineralizing Fluid Compositional Changes During Alteration Processes

Idrus

2018

Indonesian J. Geosci.

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This study aims to understand the petrography and chemistry of both magmatic and hydrothermal biotites in porphyry copper-gold deposits, and to evaluate the fluid compositional changes during alteration processes. A total of 206 biotite grains from selected rock samples taken from the Batu Hijau porphyry Cu-Au deposit was analyzed. Detailed petrography and biotite chemistry analysis were performed on thin sections and polished thin sections, respectively, representing various rocks and alteration types. A JEOL JXA-8900R electron microprobe analyzer (EMPA) was used for the chemistry analysis. The biotite is texturally divided into magmatic and hydrothermal types. Ti, Fe, and F contents can be used to distinguish the two biotite types chemically. Some oxide and halogen contents of biotite from various rocks and alteration types demonstrate a systematic variation in chemical composition. Biotite halogen chemistry shows a systematic increase in log (X Cl /X OH) and decrease in log (X F /X OH) values from biotite (potassic) through chlorite-sericite (intermediate argillic) to actinolite (inner propylitic) zones. The y-intercepts on the log (X Cl /X OH) vs. X Mg and log (X F /X OH) vs. X Fe plotted for biotite from potassic and intermediate argillic zones are similar or slightly different. In contrast, the y-intercepts on the log (X Cl /X OH) vs. X Mg and log (X F /X OH) vs. X Fe plotted for biotite from inner propylitic zone display different values in comparison to the two alteration zones. Halogen (F,Cl) fugacity ratios in biotite show a similar pattern: in the potassic and intermediate argillic zones they show little variation, whereas in the inner propylitic zone they are distinctly different. These features suggest the hydrothermal fluid composition remained fairly constant in the inner part of the deposit during the potassic and intermediate argillic alteration events, but changed significantly towards the outer part affected by inner propylitic alteration. High halogen content, particularly Cl, in hydrothermal biotite may portray that copper and gold were transported in mineralizing fluids in the form of chloride complexes CuCl 2 and AuCl 2-, respectively.

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Geochemical characteristics of biotite from felsic intrusive rocks around the Sisson Brook W–Mo–Cu deposit, west-central New Brunswick: An indicator of halogen and oxygen fugacity of magmatic systems

Cited by 67 publications

References 81 publications

Copper Mineralization Potential of Late Triassic Granitoids in Northern Yidun Arc, SW China

Copper Mineralization Potential of Late Triassic Granitoids in Northern Yidun Arc, SW China

Mineralogical constraints on Nb–REE mineralization of the Zhujiayuan Nb (−REE) deposit in the North Daba Mountain, South Qinling, China

Petrography and Mineral Chemistry of Magmatic and Hydrothermal Biotite in Porphyry Copper-Gold Deposits: A Tool for Understanding Mineralizing Fluid Compositional Changes During Alteration Processes

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