Hydrothermal fluids, argon isotopes and mineralization ages of the Fankou Pb–Zn deposit in south China: Insights from sphalerite 40Ar/39Ar progressive crushing

Jiang, Yingde; Qiu, Hua‐Ning; Xu, Yi‐Gang

doi:10.1016/j.gca.2012.01.044

Cited by 27 publications

(44 citation statements)

References 18 publications

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“…Anomalously old apparent ages are obtained from the early crushing steps, even older than the Earth's age, indicating that significant amounts of excee argon were incorporated in the fluid inclusions. Following the reasoning of Qiu and co-workers Wijbrans, 2006, 2008;Qiu and Jiang, 2007;Jiang et al, 2012;Bai et al, 2013), the SFIs can be easily liberated during the early crushing steps, due to their relatively large volume and distribution characteristics along crack. In contrast, the PFIs are isolated and randomly distributed in host crystals, only can be extracted with more impacts.…”

Section: Gas Release Pattern and Argon Reservoirsmentioning

confidence: 99%

“…To search for elemental correlations, we performed multiple regressions on the amount of 40 Ar*, K-derived 39 Ar K , Cl-derived 38 Ar Cl and air-derived 36 Ar with the aim of identifying the different Ar sources in the fluid inclusions (Kelley et al, 1986;Turner, 1988;Turner and Bannon, 1992;Kendrick et al, 2001;Wijbrans, 2006, 2008;Jiang et al, 2012;Bai et al, 2013). Here, 40 Ar* denotes total 40 Ar just minus atmospheric 40 Ar ( 40 Ar A ) and 40 Ar ( 40 Ar K ) produced by neutron irradiation, including both K in situ decay derived radiogenic 40 Ar ( 40 Ar R ) and parentless excess 40 Ar ( 40 Ar E ).…”

Section: Correlations Between CL and K Derived Ar Isotopesmentioning

confidence: 99%

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Fluid inclusions study and direct 40Ar/39Ar dating by in vacuo crushing of quartz veins within UHP metamorphic rocks from Yuka terrane, North Qaidam orogen, China

Wijbrans²,

Brouwer³

et al. 2015

Geochem. J.

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Section: Gas Release Pattern and Argon Reservoirsmentioning

confidence: 99%

Section: Correlations Between CL and K Derived Ar Isotopesmentioning

confidence: 99%

Fluid inclusions study and direct 40Ar/39Ar dating by in vacuo crushing of quartz veins within UHP metamorphic rocks from Yuka terrane, North Qaidam orogen, China

Wijbrans²,

Brouwer³

et al. 2015

Geochem. J.

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“…Finally, the Fankou deposit, a middle–low temperature SEDEX type Pb–Zn deposit, located in the northern part of Guangdong province, China (Deng et al, ), was selected for our research. In this area, the strata of Cambrian, Devonian, Carboniferous, Permian rocks and Quaternary sediments can be observed on the ground surface (Wei et al, ; Jiang et al, ). The orebodies are reserved under the transported cover at about 200–700 m vertical depth, in the Middle–Upper Devonian and Lower Carboniferous carbonate, shale and argillaceous carbonate formations (Yang & Chen, ).…”

Section: Geological Settingmentioning

confidence: 99%

Prospecting Application of Nanoparticles and Nearly Nanoscale Particles Within Plant Tissues

Cao

Jiang

et al. 2017

Resource Geology

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Element concentration analysis used in vegetation geochemical prospecting has acquired many achievements. Nevertheless, its limitations cannot be denied, which lead to the research subject of this paper. Plant samples were collected from Fankou lead–zinc deposit. Through high‐resolution analysis of transmission electron microscopy, here we show detailed information regarding nanoparticles and nearly nanoscale particles within natural plant tissues, whose compositions are mainly metallic elements (metal‐bearing particles). The particles exhibit a wide size range (from 30 nm to 1.5 µm in one dimension), diverse shapes and smooth edges. Natural Au particles could be observed. Pb‐, Zn‐, Ag‐, Cr‐bearing particles could be detected frequently as well, along with elemental S. Combined with the results of the background sample, a relationship between the particles contained in mine plant bodies and the known orebody buried underground was demonstrated. A continuous process whereby metallic elements are transferred from concealed orebody to the ground surface and then preserved within plant bodies has been taken into consideration. We verify the feasibility in theory and practice, and propose a model that particles contained in plant tissues can be applied to the exploration of deep concealed metal deposits, which may improve the accuracy and sensitivity of blind ore prospecting.

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“…Therefore, it seems that the extremely high ages at the first steps of in vacuo crushing (w5 Ga) cannot be caused by 39 Ar K loss by recoil. More likely, the extremely apparent ages can be interpreted as the contamination of excess 40 Ar which derived from the bigger, easily crushed, secondary fluid inclusions (Qiu andWijbrans, 2006, 2008;Jiang et al, 2012).…”

Section: Amphibolementioning

confidence: 99%

“…In addition to that, sulphide minerals (e.g., pyrite and sphalerite) Qiu and Jiang, 2007;Jiang et al, 2012), volatile-rich metamorphic minerals from hydrothermal deposits (e.g., scapolite) (Kendrick and Phillips, 2009b), and low-potassium minerals from HP/UHP metamorphic rocks (e.g., garnet) (Qiu andWijbrans, 2006, 2008) have been analyzed with some success using this dating method. In a critique of this method, Kendrick and Phillips (2009b) argued that a significant amount of lattice-hosted noble gas from scapolite can be released during prolonged crushing, but a number of studies have indicated that crushing has very little effect on the gas component that is trapped within the crystal lattice (Dunlap and Kronenberg, 2001;Qiu et al, 2002;Qiu and Jiang, 2007;Qiu and Wijbrans, 2008;Qiu et al, 2010;Jiang et al, 2012;Bai et al, 2013). This suggests that a combination of 40 Ar/ 39 Ar dating during progressive crushing and stepwise heating of the crushed powder could provide an opportunity to distinguish the gas components trapped inside fluid inclusions and on the grain boundaries of solid inclusions from the component of the gas within the crystal lattice (Villa, 2001).…”

Section: Introductionmentioning

confidence: 99%

Retrograde metamorphism of the eclogite in North Qaidam, western China: Constraints by joint 40Ar/39Ar in vacuo crushing and stepped heating

Wijbrans

Brouwer

et al. 2015

Geoscience Frontiers

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a b s t r a c tTwo amphiboles and a syn-metamorphic quartz vein from the Yuka terrane, North Qaidam, western China, have been analyzed by joint 40 Ar/ 39 Ar crushing in vacuo and stepwise heating techniques. The crushing in vacuo results provide information to directly constrain the timing of fluid activity and the age of amphibolite-facies retrogression. The stepwise heating results could further be used to decipher the thermal history of the UHP rocks. Amphiboles from amphibolites and quartz vein within garnetamphibolite lens analyzed by in vacuo crushing yield similarly shaped age spectra and exhibit relatively flat age plateaus for the last several steps. The characteristics of gas release patterns and geochronological data testify to the presence of significant excess 40 Ar within the fluid inclusions. The age plateaux with weighted mean ages (WMA) ranges from 488 to 476 Ma for amphiboles and 403 Ma for quartz (2s). These data points constitute amphibole WMA yielding excellent isochrons with isochron ages of 469 and 463 Ma with initial 40 Ar/ 36 Ar ratios of 520 and 334, respectively. The isochron ages are interpreted to represent initial amphibolite-facies retrogression. The data points constituting the quartz age plateaux give an isochron age of 405 Ma with initial 40 Ar/ 36 Ar ratio of 295, recording a significant aqueous fluid flow episode during the early Devonian. Age spectra obtained by stepwise heating of amphibole residues remaining after crushing experiments are characterized by younger and relatively complex age spectra, which are probably influenced by the combined effects of resetting argon and/or mineral inclusions. Nevertheless, we note that the spectra shapes have features in common: excluding the last two steps, minimum apparent ages are found at temperatures of around 500 C, corresponding to 319 and 249 Ma, perhaps representing the time of isotopic resetting or resulting from release gas from mineral inclusions of, e.g., biotite or feldspar. Maximum apparent ages are obtained at temperatures of around 800 C, corresponding to 418 and 413 Ma, which probably reflect mixed ages of radiogenic resetting and original amphibole. These results indicate that the Yuka eclogites and their retrogressed equivalents were overprinted by multiple thermal events in the Silurian and possibly as young as the Triassic.Ó 2015, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/3.0/).

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Hydrothermal fluids, argon isotopes and mineralization ages of the Fankou Pb–Zn deposit in south China: Insights from sphalerite 40Ar/39Ar progressive crushing

Cited by 27 publications

References 18 publications

Fluid inclusions study and direct <sup>40</sup>Ar/<sup>39</sup>Ar dating by <i>in vacuo</i> crushing of quartz veins within UHP metamorphic rocks from Yuka terrane, North Qaidam orogen, China

Fluid inclusions study and direct <sup>40</sup>Ar/<sup>39</sup>Ar dating by <i>in vacuo</i> crushing of quartz veins within UHP metamorphic rocks from Yuka terrane, North Qaidam orogen, China

Prospecting Application of Nanoparticles and Nearly Nanoscale Particles Within Plant Tissues

Retrograde metamorphism of the eclogite in North Qaidam, western China: Constraints by joint 40Ar/39Ar in vacuo crushing and stepped heating

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