Helium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River–Jinshajiang fault belt, SW China

Hu, Ruizhong; Burnard, Pete; Bi, Xian‐Wu; Zhou, Mei‐Fu; Pen, Jian-Tang; Su, Wenchao; Kai-xing, WU

doi:10.1016/j.chemgeo.2003.10.006

Cited by 137 publications

(54 citation statements)

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“…Because all samples in this study are pyrite or arsenopyrite, the effect of late diffusion-induced loss of He from fluid inclusions can be ruled out. Even if there is a little late diffusion-induced loss of He from fluid inclusions, the effect on 3 He/ 4 He is still within the limit of measure- (Hu et al, 2004). Also, if we assure that the content of U in fluid inclusions is equal to its average crustal abundance of 2.7 × 10 -6 (most probably higher than the real value of fluid inclusions), Th/U=0 (almost insoluble in hydrothermal solutions), and that the mineralization age is about 160 Ma (the upper limit of mineralizing age of the Furong tin orefield), we can deduct the in-situ produced radiogenic 4 He according to the method of Craig and Lupton (1996).…”

Section: The Influence Of Post-trap Processes On Helium Isotopic Compmentioning

confidence: 99%

“…Since the 1990s, helium isotopes as a tracer of ore-forming fluids have been gradually applied throughout the world. The ore types so far studied mainly include copper deposits (Hu et al, 1998a(Hu et al, , 1998bKendrick et al, 2001), gold deposits (Mao et al, 1997;Hu et al, 2004), hydrothermal sulfide deposits on the ocean floor (Turner and Stuart, 1992;Stuart, 1994;Baptiste and Fouquet, 1996), poly-metal deposits (Stuart et al, 1995;Simmons et al, 1987;Zhao et al, 2002;Xue et al, 2003;Cai et al, 2004b;Burnard and Polya, 2004;Zheng et al, 2005) and a few peculiar deposits (e.g. the Dashuigou Te-(Au) deposit; Mao and Wei, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China

Hu²,

Peng³

et al. 2006

Resource Geology

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. The Furong tin orefield, located in southern Hunan, China, is a newly‐discovered super‐large tin orefield. In contrast to most other tin deposits associated with S‐type granites, the Furong tin deposit is closely associated with the Qitianling A‐type granite. The 3He/4He ratios of fluid inclusions in pyrite and arsenopyrite from this orefield range from 0.13 to 2.95 Ra. The influence of various post‐mineralization processes on the helium isotopic composition of ore‐forming fluid inclusions are estimated negligible. Thus, the analytical values of helium isotopic composition basically represent the original values of ore‐forming fluids at the time they were trapped. The 3He/4He ratios of ore‐forming fluids from the Furong orefield indicate the existence of mantle‐source components. It supports the idea that both the Furong tin orefield and Qitianling granite formed under the geodynamic background of mantle upwelling and crustal extension.

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Section: The Influence Of Post-trap Processes On Helium Isotopic Compmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China

Hu²,

Peng³

et al. 2006

Resource Geology

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“…Even though the trapped He and Ar are partially lost, the ratios Ar remain unchanged (Baptiste and Fouquet, 1996;Ballentine and Burnard, 2002;Hu et al, 2004). Fluids responsible for Carris pyrite composition are derived from mantle and crust (Fig.…”

Section: Pyrite He-ar Datamentioning

confidence: 99%

Metallogenesis at the Carris W–Mo–Sn deposit (Gerês, Portugal): Constraints from fluid inclusions, mineral geochemistry, Re–Os and He–Ar isotopes

Moura

Dória

Neiva

et al. 2014

Ore Geology Reviews

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The Carris orebody consists of two partially exploited W-Mo-Sn quartz veins formed during successive shear stages and multipulse fluid fillings. They cut the Variscan post-D3 Gerês Itype granite. The most important ore minerals are wolframite, scheelite, molybdenite and cassiterite. There are two generations of wolframite. The earlier generation of wolframite is rare and has the highest WO 4 Mn content (91 mol%) and the most common wolframite contains 26-57 mol% WO 4 Mn. Re-Os dating of molybdenite from the ore quartz veins and surrounding granite yield ages of 279 ±1.2 Ma and 280.3±1.2 Ma, respectively which are in very good agreement with the previous ID-TIMS U-Pb zircon age for the Carris granite (280±5 Ma). The fluid inclusion studies on quartz intergrown with wolframite and scheelite, beryl and fluorite reveal that two distinct fluid types were involved in the genesis of this deposit. The first was a low to medium salinity aqueous carbonic fluid (CO 2 between 4-14 mol%) with less than 1.95 mol% N 2 , which was only found in quartz associated with wolframite. The other was a low salinity aqueous fluid found in all the four minerals. The homogenization temperatures indicate minimum entrapment temperatures of 226-310ºC (average 280ºC) for the H 2 O-CO 2 -N 2 -NaCl fluid and averages temperatures of 266ºC for scheelite and 242ºC, 190ºC and 160ºC for the last generations of beryl, fluorite and quartz, respectively. It was estimated that wolframite was deposited ~7 km depth, assuming a lithostatic pressure, probably due to strong pressure fluctuation caused by seismic events triggered by brittle tectonics during the exhumation event. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPTPrecipitation of scheelite and sulphides took place later, at the same depth, but under an hydrostatic or suprahydrostatic pressure regime, and probably caused by mixing between the magmatic-hydrothermal fluid and meteoric waters that deeply penetrated the basement during post-Variscan decompression.

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“…For this reason, noble gases are becoming an important research tool in deducing fluid sources because of their relatively unreactive nature in the geochemical environment (Turner et al 1993;Ballentine et al 2002;Kennedy et al 2002;Kendrick et al 2007;Fairmaid et al 2011). In particular, noble gases can retain evidence of mantle and associated magmatic source regions despite extensive fluid mobility through crustal rocks (Mao et al 2003;Burnard and Polya 2004;Hu et al 2004;Graupner et al 2006). In this study, we use noble gas contents of fluid inclusions to provide information on fluid sources and indications of potential fluid mixing along the fluid pathways.…”

Section: Introductionmentioning

confidence: 99%

Noble gases fingerprint a metasedimentary fluid source in the Macraes orogenic gold deposit, New Zealand

et al. 2016

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Ar ratios up to 200 times greater than air. Similarly, I/Cl ratios for fluids extracted from mineralised quartz are similar to those of brines from marine sediments that have interacted with organic matter and are ten times higher than typical magmatic/mantle fluids. The Macraes mineralising fluids were compositionally variable, reflecting either mixing of two different crustal fluids in the metasedimentary pile or a single fluid type that has had varying degrees of interaction with the host metasediments. Evidence for additional input of meteoric water is equivocal, but minor meteoric incursion cannot be discounted. The Macraes deposit formed in a metasedimentary belt without associated coeval magmatism, and therefore represents a purely crustal metamorphogenic end member in a spectrum of orogenic hydrothermal processes that can include magmatic and/or mantle fluid input elsewhere in the world. There is no evidence for involvement of minor intercalated metabasic rocks in the Macraes mineralising system. Hydrothermal fluids that formed other, smaller, orogenic deposits in the same metamorphic belt have less pronounced noble gas and halogen evidence for crustal fluid-rock interaction than at Macraes, but these deposits also formed from broadly similar metamorphogenic processes.

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Helium and argon isotope geochemistry of alkaline intrusion-associated gold and copper deposits along the Red River–Jinshajiang fault belt, SW China

Cited by 137 publications

References 44 publications

Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China

Helium Isotope Geochemistry of Ore‐forming Fluids from Furong Tin Orefield in Hunan Province, China

Metallogenesis at the Carris W–Mo–Sn deposit (Gerês, Portugal): Constraints from fluid inclusions, mineral geochemistry, Re–Os and He–Ar isotopes

Noble gases fingerprint a metasedimentary fluid source in the Macraes orogenic gold deposit, New Zealand

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