Systematics of Sulfur and Carbon Isotopes in Hydrothermal Ore Deposits

Ohmoto, Hiroshi

doi:10.2113/gsecongeo.67.5.551

Cited by 1,403 publications

(752 citation statements)

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“…Entretanto, Ohmoto (1986¡' 1992 e Misi (1999) Krouse (1971) Krouse (1971) :p-u__U9--^w-s" J 19 --^pv:p--ll9l (Ohmoto, 1972, Ohmoto et ø1., 1998 29.17 20.89 20.73 20.71 21.13 20.99 20.8E 20.53 20.66 MgO 19.71 20.51 20.80 20.45 20.18 20.78 20.78 20.94 20.32 20.43 20.66 20.68 0.003 0.001 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 si 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Ba 0.002 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0.001 Sr 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.000 0.001 0.000 0. O,OOO 66,258 0,272 0,000 0,055 0,000 0,000 0,000 0,000 0,000 0,000 0,000 0,037 0,336 0,005 0,020 32,187 0,051 0,000 65,646 0,665 0,007 0,000 0,016 0,000 0,000 0,000 0,000 0,000 0,000 0,065 0,3.t4 o,ooo o,oo9 32,287 0,172 0,000 6s,291 0,717 0,000 0,000 0,007 0,000 0,000 0,000 0,000 0,000 0,000 0,000 1,3 0,00 0,50 0,00 0,0 0,00 0,00 0,00 1,1 0,00 0,60 0,00 0,9 0,00 0,00 0,00 1l,0 2,20 8,90 201,00 0,0 0,00 0,00 0,00 2,0 1,10 1,40 0,00 6,3 1,s0 2,50 37,00 0,0 0,00 0,60 0,00 0,5 0,00 0,00 0,00 0,0 0,00 0,00 0,00 0,0 0,00 0,00 0,00 0,8 0,00 0,00 0,00 11,4 4,40 4,80 120,00 0,0 0,00 0,00 0,00 0,0 0,00 0,00 0,00 0,0 0,00 0,00 0,00 0,9 3,50 8,10 69,00 1,0 4,10 4,50 36,00 0,0 0,00 0,00 0,00 0,0 0,00 0,00 0,00 0,0 0,00 0,00 0,00 0,0 0,00 0,00 34,00 0,0 0,00 0,00 37,00 0,0 0,00 0,00 0,00 0.0 0.00 5.00 0.00 Zo a dn Ìalha àe Vaza t¿ -Doloûtilos e añásías tectistalízadas, brechados e dketuh',t Lidtote|nalìnente F-364-11 0,00 0,10 0,00 0,00 0,00 0,00 0,00 0,00 0,00 0,00 F-551-r'17 0,20 0,50 2,00 4,00 0,00 0,30 0,10 0,00 0,00 0,00 y7 -0,40 0,40 4,30 8,00 0,00 Û,80 0,20 0,00 0,20 0,00 I-568-¡ Z,4O 0,30 3,40 5,00 0,00 0,50 0,00 0,00 0,00 0,00 F,466-3 0,00 1,10 2,10 6,00 0,00 0,40 0,00 0,00 0,10 0,00 l¡-551-l-17 0,60 1r,00 44,40 91,00 37,00 5,80 1,20 0.80 2,5D 0,39 î-04-2 0,00 0,40 1,00 0,00 0,00 0,20 0,00 0,00 0,00 0,00 jt¡-08-2 0,00 0,20 1,00 0,00 0,00 0,20 0,00 0,00 0,00 0,00 F-568-4 2,40 0,30 3,40 5,00 0,00 0,50 0.00 0,00 0,00 0,00 F-466-S 0,00 34,10 13,10 35,00 23,00 5,10 1,80 1,10 3,10 0,45 YZ-32C 0,60 35,00 11,60 33,00 19,00 4,90 1,50 1,00 .3,10 0,43…”

Section: óXidos O/o Elementosunclassified

Modelamento metalogenético dos depósitos de zinco de Vazante, Fagundes e Ambrósia, associados ao Grupo Vazante, Minas Gerais

Monteiro¹

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Section: óXidos O/o Elementosunclassified

Modelamento metalogenético dos depósitos de zinco de Vazante, Fagundes e Ambrósia, associados ao Grupo Vazante, Minas Gerais

Monteiro¹

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“…These concentrations suggest that the first phase of skarn type of W-Au mineralization at 143.8-146.3 Ma associated with the diorite dykes was a mixed derivation between crust and mantle and the second one of skarn type of W-Mo mineralization at 135.0 ± 1.2 Ma associated with the fine-grained granite formed from a crustal-dominated system. The δ 34 S composition of magmatic sulfides in uncontaminated mafic and felsic magmas is normally 0 ± 3.0‰ (Ohmoto, 1986;Chaussidon & Lorand, 1990;Ohmoto & Goldhaber, 1997). The isotopic composition of magmatic hydrothermal fluids derived from ∼0‰ I-type granitic magmas can be 3-5‰ heavier than the δ 34 S of the melt (Ohmoto, 1986;Chaussidon & Lorand, 1990).…”

Section: Implications Of Molybdenite Re-os and Sulfur Isotopic Data Fmentioning

confidence: 99%

Two Periods of Skarn Mineralization in theBaizhangyanW–MoDeposit, SouthernAnhui Province, SoutheastChina: Evidence from ZirconU–Pband MolybdeniteRe–Osand Sulfur Isotope Data

Jiang

Xing

et al. 2015

Resource Geology

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The recently discovered Baizhangyan skarn-porphyry type W-Mo deposit in southern Anhui Province in SE China occurs near the Middle-Lower Yangtze Valley polymetallic metallogenic belt. The deposit is closely temporally-spatially associated with the Mesozoic Qingyang granitic complex composed of granodiorite, monzonitic granite, and alkaline granite. Orebodies of the deposit occur as horizons, veins, and lenses within the limestones of Sinian Lantian Formation contacting with buried fine-grained granite, and diorite dykes. There are two types of W mineralization: major skarn W-Mo mineralization and minor granite-hosted disseminated Mo mineralization. Among skarn mineralization, mineral assemblages and cross-cutting relationships within both skarn ores and intrusions reveal two distinct periods of mineralization, i.e. the first W-Au period related to the intrusion of diorite dykes, and the subsequent W-Mo period related to the intrusion of the fine-grained granite. In this paper, we report new zircon U-Pb and molybdenite Re-Os ages with the aim of constraining the relationships among the monzonitic granite, fine-grained granite, diorite dykes, and W mineralization. Zircons of the monzonitic granite, the fine-grained granite, and diorite dykes yield weighted mean U-Pb ages of 129.0 ± 1.2 Ma, 135.34 ± 0.92 Ma and 145.3 ± 1.7 Ma, respectively. Ten molybdenite Re-Os age determinations yield an isochron age of 136.9 ± 4.5 Ma and a weighted mean age of 135.0 ± 1.2 Ma. The molybdenites have δ 34 S values of 3.6‰-6.6‰ and their Re contents ranging from 7.23 ppm to 15.23 ppm. A second group of two molybdenite samples yield ages of 143.8 ± 2.1 and 146.3 ± 2.0 Ma, containing Re concentrations of 50.5-50.9 ppm, and with δ 34 S values of 1.6‰-4.8‰. The molybdenites from these two distinct groups of samples contain moderate concentrations of Re (7.23-50.48 ppm), suggesting that metals within the deposit have a mixed crust-mantle provenance. Field observation and new age and isotope data obtained in this study indicate that the first diorite dyke-related skarn W-Au mineralization took place in the Early Cretaceous peaking at 143.0-146.3 Ma, and was associated with a mixed crust-mantle system. The second fine-grained granite-related skarn W-Mo mineralization took place a little later at 135.0-136.9 Ma, and was crust-dominated. The fine-grained granite was not formed by fractionation of the Qingyang monzonitic Resource Geology Vol. 65,

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“…It is now well realized that data on sulphur composition alone are usually insufficient to define the sulphur source of an ore because large isotopic fractionations are involved in almost all the chemical reactions involved in mineralization (Ohmoto, 1972). Consequently, the accurate estimation of a sulphur source generally requires many additional data (such as pH, jD2, and 2') because oxidation-reduction processes induce large isotopic fractionations between sulphides and coeval dissolved sulphates (Ohmoto, 1972;Arnold and Sheppard, 1981). Similar difficulties occur if bacterial sulphate reducers are involved in near surface marine environments because the isotopic composition of biogenic SH, depends upon nutrient supply, reduction rate, sulphate concentration, and temperature (Harrison and Thode, 1957).…”

Section: The Isotopic Composition Of Sulphurmentioning

confidence: 99%

The origin of gypsum in Vertisols in New Caledonia determined by isotopic characteristics of sulphur

Podwojewski¹,

Arnold

1994

Geoderma

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Gypsum crystals occur in Vertisols on the west coast of New Caledonia. These soils are derived from the weathering of basic rocks that contain no gypsum. The sulphur isotopic ratio 34S/32S was used as tracer to identify the origin of the gypsum. A total of 26 measurements of 1 3~~s were made on gypsum crystals from the Vertisols and compared to those of continental sulphates and to marine gypsum in tidal flats. The S34S value of the crystals located in New Caledonian Vertisols decreases with increasing distance from the coast. This suggests that the gypsum in the Vertisols comes from two sources: an oceanic source where the major part of the sulphur is introduced by atmospheric precipitation, and a continental source where sulphides disseminated in various subsurface deposits are oxidized. Gypsum from atmospheric precipitation penetrates the Vertisols through vertical cracks that probably formed in dry seasons during the last glacial period.

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Systematics of Sulfur and Carbon Isotopes in Hydrothermal Ore Deposits

Cited by 1,403 publications

References 0 publications

Modelamento metalogenético dos depósitos de zinco de Vazante, Fagundes e Ambrósia, associados ao Grupo Vazante, Minas Gerais

Modelamento metalogenético dos depósitos de zinco de Vazante, Fagundes e Ambrósia, associados ao Grupo Vazante, Minas Gerais

Two Periods of Skarn Mineralization in theBaizhangyanW–MoDeposit, SouthernAnhui Province, SoutheastChina: Evidence from ZirconU–Pband MolybdeniteRe–Osand Sulfur Isotope Data

The origin of gypsum in Vertisols in New Caledonia determined by isotopic characteristics of sulphur

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