Geochemistry and mineralization age of magnesian skarn-type iron deposits of the Janggun mine, Republic of Korea

Lee, C. H.; Lee, H. K.; Kim, S. J.

doi:10.1007/s001260050156

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…However, purely ultramafic magmatic genesis can easily be discounted on the basis of the very negative and varied Mg isotopic compositions of the Zhaoanzhuang iron deposit ( Table 2 and Table S1), which is inconsistent with the limited Mg isotopic fractionation produced during partial melting and crystal fractionation [47,[59][60][61]. Despite the fact that these isotopic compositions do not entirely discount the possibility of intrusion-associated magnesian skarn-type deposits hosted in dolomitic carbonate rocks, based on the limited outcrops and the analyzed samples, we believe that magmatic skarn mineralization should be excluded as a possibility due to the following arguments: (1) There is no significant enrichment of any other base metal, which is common in other intrusion-associated skarn deposits [171,180,181]. (2) There is no alteration zonation, which is common in skarn mineralization systems when magma intrudes the wall rock.…”

Section: Implications For Provenance and Metallogenic Processesmentioning

confidence: 86%

“…Examples of this type of skarn include the Galinge iron-bearing magnesian skarn zone in the Qiman Tagh metallogenic belt, western Tianshan, China, which formed through the interaction between granodiorite and dolomitic marble [170], and the Janggun magnesian skarn-type iron deposits, Republic of Korea, which developed in the Cambrian dolomitized Janggun Limestone along its contact with the Jurassic Chunyang granite [171]. The gangue minerals in the ores mainly include Mg-rich forsterite, serpentine, chondrodite, clinochlore, talc, phlogopite, dipside, and carbonate minerals (dolomite, magnesite, and calcite), while the ore minerals include magnetite, hematite, pyrrhotite, and various other sulfides [171]. Chemical sedimentogenic Mg-Fe deposits were most commonly formed in the Precambrian and underwent various levels of late metamorphic or hydrothermal processes.…”

Section: Implications For Provenance and Metallogenic Processesmentioning

confidence: 99%

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Stable Isotope (S, Mg, B) Constraints on the Origin of the Early Precambrian Zhaoanzhuang Serpentine-Magnetite Deposit, Southern North China Craton

Meng

et al. 2019

Minerals

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The origin of the Zhaoanzhuang serpentine-magnetite deposit in the southern North China Craton (NCC) is highly disputed, with some investigators having proposed an ultramafic origin, whereas others favor a chemical sedimentary origin. These discrepancies are largely due to the difficulty in determining the protolithic characteristics of the highly metamorphosed rocks. Sulfur, magnesium, and boron isotope geochemistry combined with detailed petrography was carried out in this study to constrain the original composition of the Zhaoanzhuang iron orebodies. Anhydrite is present as coarse crystals intergrown with magnetite, indicating that the anhydrite formed simultaneously with the magnetite during metamorphism rather than as a product of later hydrothermal alteration. The anhydrite has a narrow range of positive δ34S values from +19.8 to +22.5‰ with a mean value of +21.1‰. These values are significantly higher than that of typical magmatic sulfur (δ34S = 0 ± 5‰) and deviate away from primary igneous anhydrite towards mantle-sulfur isotopic values, but they are similar to those of marine evaporitic anhydrite and gypsum (~+21‰). The sulfur isotopic compositions of several samples show obvious signs of mass-independent sulfur fractionation (Δ33S = −0.47‰ to +0.90‰), suggesting that they were influenced by an external sulfur source through a photochemical reaction at low oxygen concentrations, which is consistent with the Neoarchean-Paleoproterozoic atmosphere. Coarse-grained tourmaline from the tourmaline-rich interlayers of the orebodies occurs closely with Mg-rich minerals such as phlogopite, talc, and diopside, indicating that it has a metamorphic origin. The δ11B values of the tourmaline range from −0.2‰ to +3.6‰ with a mean value of +2.0‰, which is much positive relative to that of magmatic tourmaline but is consistent with that of carbonate-derived tourmaline. The magnesium isotopic analyses of the serpentine–magnetite ores and the magnesium-rich wall rocks revealed a wide range of very negative δ26Mg values from −1.20‰ to −0.34‰ with an average value of −0.80‰. The value is higher than that of ultramafic rocks (δ26Mg = −0.25‰) and exhibits minor Mg isotopic fractionation. However, these values are consistent with those of marine carbonate rocks, which have lower δ26Mg values and larger Mg isotopic variations (δ26Mg = −0.45‰ to −4.5‰). Collectively, the S–Mg–B isotopic characteristics of the Zhaoanzhuang iron orebodies clearly indicate a chemical sedimentary origin. The protoliths of these orebodies most likely reflect a series of Fe–Si–Mg-rich marine carbonate rocks with a considerable evaporite component, indicating a carbonate-rich superior-type banded iron formation precipitated in an evaporitic shallow marine sedimentary environment.

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Section: Implications For Provenance and Metallogenic Processesmentioning

confidence: 86%

Section: Implications For Provenance and Metallogenic Processesmentioning

confidence: 99%

Stable Isotope (S, Mg, B) Constraints on the Origin of the Early Precambrian Zhaoanzhuang Serpentine-Magnetite Deposit, Southern North China Craton

Meng

et al. 2019

Minerals

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“…Lens-and pipe-shaped orebodies are hosted in the Janggun limestone Formation of the Joseon Supergroup which was structurally controlled by the Jurassic Chunyang granite (148.5 Ma). The K-Ar ages of sericite from Zn-Pb ore yielded 70.0-73.6 Ma (Lee et al, 1996).…”

Section: Janggunmentioning

confidence: 99%

Indium and gallium enrichments in zinc orebodies in the Taebaeksan region, Korea

et al. 2022

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concentrated in relatively higher temperature, whereas Ga tends to be enriched in lower temperature. The enrichment processes of In and Ga in sphalerite might be strongly related to their complexations in the magmatic-hydrothermal fluids. High salinity in the fluid is favorable to form an In-chloride complex for mobilization and enrichment of In into sphalerite. Conversely, Ga-hydroxide complex might not be stable at relatively high temperature which could limit an economic enrichment of Ga in sphalerite in the region.

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“…+10.5‰) (Lee and Park, 1996), and Janggun-B Pb-Zn (av. +6.5‰) (Lee et al, 1998b) are typically associated with carbonate rocks in the Taebaeksan basin and the Yeongnam massif. The highest δ 34 S value may be attributed to the reactions of hydrothermal fluids with carbonate rocks containing 34 S-enriched marine sulfur (McCuaig and Kerrich, 1998).…”

Section: Sulfur Isotope Variance Of Metallic Deposits By Deposit Typementioning

confidence: 99%

Regional variations of sulfur isotope compositions for metallic deposits in South Korea

Jeong

Shin

2021

Resource Geology

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Southern Korean peninsula comprises five major geotectonic provinces, throughout which various metallic deposits are distributed. We reviewed sulfur isotope data (n = 1,574) of sulfide minerals collected from previous works for 177 metallic deposits in the provinces to interpret the sulfur isotope characteristics of each province, comprising different wall rocks and geologic settings.The averaged δ 34 S values of each metallic deposit associated with Precambrian metamorphic rocks and Jurassic granitoids in the Gyeonggi massif and Yeongnam massif range from −7.1 to +10.3‰ (av. +4.5‰) and from −3.6 to +7.8‰ (av. +3.5‰), respectively. The Taebaeksan basin produced the highest δ 34 S value among the five, −0.4 to +13.2‰ (av. +6.1‰). This was influenced by sulfate sulfur derived from marine carbonate host rock. The Okcheon metamorphic belt, comprising metasedimentary and metavolcanics rocks, shows an isotope range from +1.9 to +8.3‰ (av. +5.7‰). The sulfur isotope distribution of the Gyeongsang basin with a range from −1.2 to +11.7‰ (av. +5.2‰) can be divided into two zones: higher δ 34 S values from the inner zone related to the volcanic rocks and magnetite-series Cretaceous granitoids, and lower δ 34 S values from the outer zone related to the organic-rich sedimentary rocks. Sulfur isotope variations of metallic deposits in each geotectonic province were mainly influenced by igneous sulfur and inherent wall rock sulfur sources, 32 S-enriched sedimentary sulfur (e.g., Precambrian metasedimentary rocks and biogenic sulfur-rich sedimentary rocks), and 34 S-enriched seawater sulfur (e.g., carbonates and acid to intermediate volcanic rocks). These wall rocks also contributed to the changes in δ 34 S values for granitoid rocks and metallic deposits by time, ore genetic type, and ore species in South Korea.

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Geochemistry and mineralization age of magnesian skarn-type iron deposits of the Janggun mine, Republic of Korea

Cited by 12 publications

References 15 publications

Stable Isotope (S, Mg, B) Constraints on the Origin of the Early Precambrian Zhaoanzhuang Serpentine-Magnetite Deposit, Southern North China Craton

Stable Isotope (S, Mg, B) Constraints on the Origin of the Early Precambrian Zhaoanzhuang Serpentine-Magnetite Deposit, Southern North China Craton

Indium and gallium enrichments in zinc orebodies in the Taebaeksan region, Korea

Regional variations of sulfur isotope compositions for metallic deposits in South Korea

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