2018
DOI: 10.3390/min8100471
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Helium and Argon Isotopes in the Fe-Mn Polymetallic Crusts and Nodules from the South China Sea: Constraints on Their Genetic Sources and Origins

Abstract: In this study, the He and Ar isotope compositions were measured for the Fe-Mn polymetallic crusts and nodules from the South China Sea (SCS), using the high temperature bulk melting method and noble gases isotope mass spectrometry. The He and Ar of the SCS crusts/nodules exist mainly in the Fe-Mn mineral crystal lattice and terrigenous clastic mineral particles. The results show that the 3 He concentrations and R/R A values of the SCS crusts are generally higher than those of the SCS nodules, while 4 He and 40… Show more

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Cited by 3 publications
(2 citation statements)
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“…To address the above-mentioned questions, the application of noble gas (especially helium and argon) isotope geochemistry is key to defining the origin of ore-forming fluids. In particular, as a monatomic chemically inert gas ( 3 He behaves extremely conservatively during mixing of mantle-/crustal-derived fluids with meteoric water), helium is considered to be one of the most sensitive geochemical tracers for such studies and has distinct isotopic signatures in different types of geological reservoirs [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For ancient polymetallic ore deposits, the He-Ar isotopic compositions of hydrothermal fluids are faithfully preserved when trapped as fluid inclusions by mineral phases such as pyrite, chalcopyrite, sphalerite, or galena, and thus can be widely used to reveal the degree of fluid-rock interaction, mantle degassing or magmatic activity [35][36][37][38][39][40][41][42][43][44][45][46][47].…”
Section: Introductionmentioning
confidence: 99%
“…To address the above-mentioned questions, the application of noble gas (especially helium and argon) isotope geochemistry is key to defining the origin of ore-forming fluids. In particular, as a monatomic chemically inert gas ( 3 He behaves extremely conservatively during mixing of mantle-/crustal-derived fluids with meteoric water), helium is considered to be one of the most sensitive geochemical tracers for such studies and has distinct isotopic signatures in different types of geological reservoirs [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. For ancient polymetallic ore deposits, the He-Ar isotopic compositions of hydrothermal fluids are faithfully preserved when trapped as fluid inclusions by mineral phases such as pyrite, chalcopyrite, sphalerite, or galena, and thus can be widely used to reveal the degree of fluid-rock interaction, mantle degassing or magmatic activity [35][36][37][38][39][40][41][42][43][44][45][46][47].…”
Section: Introductionmentioning
confidence: 99%
“…In addition, a number of mining areas with the potential for exploitation were also found in the Atlantic Ocean [8,11], Indian Ocean [12,13], and Arctic Ocean [14]. In addition to the open oceans, some Fe-Mn crust deposits were also discovered near the continental margin, such as the Baltic Sea [15], the California continental margin [2,16,17], and the South China Sea (SCS) [18][19][20][21].…”
Section: Introductionmentioning
confidence: 99%