SULFUR AND LEAD ISOTOPE STUDY OF THE EL MOCHITO Zn-Pb-Ag DEPOSIT

Ault, Katherine M.

doi:10.2113/gsecongeo.99.6.1223

Cited by 41 publications

(2 citation statements)

References 17 publications

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“…The δ 34 S V-CDT value close to 0‰ is consistent with a primordial volcanic or magmatic-hydrothermal sulfur source (Ohmoto and Goldhaber 1997). The range in δ 34 S in Sala sulfides falls within − 5 to + 5, which is typical of Zn skarn deposits (Bowman 1998;Ault 2004). Nevertheless, spatial variations within and between deposits indicate isotopic fractionation (Fig.…”

Section: Mechanisms Of Ore and Skarn Formationmentioning

confidence: 80%

Origin of Palaeoproterozoic, sub-seafloor Zn-Pb-Ag skarn deposits, Sala area, Bergslagen, Sweden

Jansson

Allen²,

Skogsmo³

et al. 2021

Miner Deposita

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Unravelling the genesis of metamorphosed mineral deposits can be complicated due to difficulties in separating between primary features and features that formed during the metamorphic overprint. Such uncertainty exists for stratabound and dolomite- and skarn-hosted Zn-Pb-Ag sulfide deposits in 1.89 Ga rocks in the Bergslagen lithotectonic unit (BLU) of Sweden, where a metasomatic vs. regional metamorphic origin for skarns has long been discussed. By integrating geological mapping with new lithogeochemical, mineralogical, and stable isotope data (C, O, S), we show that complexly zoned garnet and clinopyroxene skarns in the Sala area of the central BLU predate mineralization. Sphalerite-galena mineralization formed after the deposition of a younger, more Mn-rich ferroan diopside and andradite-grossular garnet, and is associated with phlogopite, tremolite-actinolite, chlorite, serpentine, and calcite. Mineralization in conjunction with a transition from high-T metasomatism to hydrolytic alteration is inferred. An average δ34SV-CDT of 1.6 ± 1.9‰ in sulfides is consistent with a primordial sulfur source. Trends defined by negative shifts in δ18OV-SMOW and δ13CV-PDB in dolomite and calcite are consistent with fluid infiltration at 300–500 °C. The alteration system is sharply truncated by unaltered, c. 1.89 Ga calc-alkaline granite and porphyritic intrusions, which along with F1 folding of the alteration zones and mineralization suggest that mineralization predate regional metamorphism. The Sala deposits are interpreted as Zn skarn deposits formed in conjunction with the emplacement of intrusions into penecontemporaneous marine volcanic and dolomitized limestone strata. The unusually Mg-rich mineralogy in relation to Zn skarns worldwide most likely reflects the dolomitic precursor.

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Section: Mechanisms Of Ore and Skarn Formationmentioning

confidence: 80%

Origin of Palaeoproterozoic, sub-seafloor Zn-Pb-Ag skarn deposits, Sala area, Bergslagen, Sweden

Jansson

Allen²,

Skogsmo³

et al. 2021

Miner Deposita

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show abstract

“…Fluid inclusion study is a vital tool to understand the genetic aspects, whereas the sulfur isotope signatures help in the understanding of the nature and source of the mineralizing fluids of an ore deposit. [90][91][92]. Sulfur isotope data also provides the information about the source of metals in a deposit [59,93].…”

Section: Genesis Of the Jagpura Au-cu Depositmentioning

confidence: 99%

Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study

et al. 2022

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The Jagpura Au-Cu deposit is situated within the Aravalli craton in the northwestern part of India. In the present work, petrography, mineral chemistry, fluid inclusion and sulfur isotopic compositions were used to study the Jagpura Au-Cu deposit. The ore mineral association of the deposit is arsenopyrite, loellingite, chalcopyrite, pyrrhotite and pyrite, along with native gold, magnetite and apatite. The gold fineness ranges from 914–937‰ (avg. 927‰). The presence of Au-Bi-Te phases, pyrite (>1 Co/Ni ratio), magnetite (≥1 Ni/Cr ratio, <1 Co/Ni ratio) and apatite (>1 F/Cl ratio) suggest the hydrothermal origin Au-Cu mineralization. A fluid inclusion study indicates the different episodes of fluid immiscibility with the homogenization temperatures varying between 120–258 °C and salinities range within the 8.86–28.15 wt% NaCl eq. The sulfur isotopic composition of sulfides varies from 8.98 to 14.58‰ (avg. 11.16‰). It is inferred that the variation in the sulfur isotopic compositions of sulfides is due to the cooling and dilution of the metalliferous fluid of mixed origin, derived from the basement meta-sedimentary rocks and the high saline basinal fluid. The iron oxide-copper-gold-apatite associations, structural control of mineralization, pervasive hydrothermal alteration, fluid salinity and sulfur isotope compositions indicate that the Jagpura Au-Cu deposit is similar to the iron oxide-copper-gold (IOCG)-iron oxide-apatite (IOA)types of deposits. Based on the ore geochemistry and the trace elements systematic of magnetite, the deposit is further classified as an IOCG-IOA type: IOCG-Co (reduced) subtype.

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Mineralogy, fluid inclusion and stable isotope study of the Jinchanghe Zn-Pb-Fe-Cu skarn deposit in southwestern China

Deng,

Chen,

Shu

et al. 2023

Miner Deposita

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SULFUR AND LEAD ISOTOPE STUDY OF THE EL MOCHITO Zn-Pb-Ag DEPOSIT

Cited by 41 publications

References 17 publications

Origin of Palaeoproterozoic, sub-seafloor Zn-Pb-Ag skarn deposits, Sala area, Bergslagen, Sweden

Origin of Palaeoproterozoic, sub-seafloor Zn-Pb-Ag skarn deposits, Sala area, Bergslagen, Sweden

Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study

Mineralogy, fluid inclusion and stable isotope study of the Jinchanghe Zn-Pb-Fe-Cu skarn deposit in southwestern China

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