Scheelite chemistry from skarn systems: implications for ore-forming processes and mineral exploration

Miranda, Ana Carolina R.; Beaudoin, Georges; Rottier, Bertrand

doi:10.1007/s00126-022-01118-y

Cited by 23 publications

(1 citation statement)

References 102 publications

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“…The REE pattern of Sch A shows a steep negative slope type (Fig. 6a) with a high (Gd/Lu) N (10.2-21.4) ratio (Table 1), which is consistent with the characteristics of oxidized skarn scheelite (Miranda et al, 2022), indicating a relatively oxidized fluid environment at this stage. Under high The metallogeny of the YPCB has been well summarized by Lin et al (2018), He concluded that the polymetallic mineralization time is focused on 37-42 Ma, as a large scale regional magmatic-hydrothermal metallogenic event (Lin et al, 2017).…”

Section: Implications For Metallogeny and Regional Explorationsupporting

confidence: 73%

Texture and Geochemistry of Multi‐stage Hydrothermal Scheelite in the Mamupu Cu‐Au‐Mo(‐W) Deposit, Eastern Tibet: Implications for Tungsten Mineralization in the Yulong Belt

ZHANG,

TANG,

LIN

et al. 2024

Acta Geologica Sinica (Eng)

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Multistage tungsten mineralization was recently discovered in the Mamupu copper‐polymetallic deposit in the southern Yulong porphyry copper belt (YPCB), Tibet. This paper reports the results of cathodoluminescence, trace element and Sr isotope analyses of Mamupu scheelite samples, designed to better constrain the mechanism of W mineralization and sources of ore‐forming fluids. Three different types of scheelite are identified in the Mamupu deposit: scheelite A (Sch A) mainly occurs in breccias during the prograde stage, scheelite B (Sch B) forms in the chlorite‐epidote alteration zone in the retrograde stage, and scheelite C (Sch C) occurs in distal quartz sulfide veins. The extremely high Mo content and negative Eu anomaly in Sch A represent high oxygen fugacity in the prograde stage. Compared with ore‐related porphyries, Sch A has a similar REE pattern, but with higher ΣREE, more depleted HREE, and slightly lower (87Sr/86Sr)i ratios, and these features suggest that Sch A is genetically related to ore‐related porphyries, but the extensive interaction with carbonate surrounding rocks affects the final REE and Sr isotopic composition. Sch B shows dark (Sch B‐I) and light (Sch B‐II) domains under CL images. From Sch B‐I to Sch B‐II, LREEs are gradually depleted, and MREEs are gradually enriched. Sch C has the highest LREE/HREE ratio, which indicates that it inherited the geochemical characteristics of fluids after the precipitation of HREE‐rich minerals such as diopside, and garnet in the early prograde stage. The Mo content in Sch B and Sch C gradually decreased, indicating that the oxygen fugacity of the fluids changed from oxidation in the early stage to reduction in the later stage, and the turbulent Eu anomaly in Sch B and Sch C indicates that the Eu anomaly in the Mamupu scheelite is not only controlled by oxygen fugacity. The extensive interaction of magmatic‐hydrothermal fluids and carbonate provides the necessary Ca2+ for the precipitation of scheelite in the Mamupu deposit.

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Section: Implications For Metallogeny and Regional Explorationsupporting

confidence: 73%

Texture and Geochemistry of Multi‐stage Hydrothermal Scheelite in the Mamupu Cu‐Au‐Mo(‐W) Deposit, Eastern Tibet: Implications for Tungsten Mineralization in the Yulong Belt

ZHANG,

TANG,

LIN

et al. 2024

Acta Geologica Sinica (Eng)

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Distribution of chalcophile elements during crystallisation and alteration of magmatic Ni-Cu-Co sulfide deposits in the anorthositic Espedalen Complex, Norway: pentlandite as an indicator for tracking metal tenors

Mansur,

Dare,

Slagstad

et al. 2024

Miner Deposita

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Polyphase stratabound scheelite-ferberite mineralization at Mallnock, Eastern Alps, Austria

Altenberger,

Krause,

Wintzer

et al. 2024

Miner Deposita

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A peculiar type of stratabound tungsten mineralization in metacarbonate rocks was discovered and explored at Mallnock (Austria) during the late 1980s. It is the only tungsten occurrence in the Eastern Alps in which scheelite is associated with wolframite (96 mol% ferberite). The tungsten prospect is located in the Austroalpine Drauzug-Gurktal Nappe System recording polyphase low-grade regional metamorphism. Raman spectroscopy of carbonaceous material yield maximum metamorphic temperatures of 296 ± 27 °C and 258 ± 27 °C, which are assigned to Variscan and Eoalpine metamorphism, respectively. Scheelite and ferberite occur as polyphase stockwork-like mineralization in Fe-rich magnesite in the northern ore zone (Mallnock North), whereas in the western ore zone (Mallnock West), scheelite-quartz veinlets are exclusively hosted in dolomitic marbles. LA-ICP-MS analyses of scheelite and ferberite yield low contents of Mo, Nb, Ta, and rare earth elements, but high contents of Na and Sr. Uranium is particularly high in scheelite (up to 200 µg/g) and makes this mineral a suitable target for U–Pb dating. In situ U–Pb dating of scheelite yielded an early Permian age (294 ± 8 Ma) for Mallnock West and a Middle Triassic age (239 ± 3 Ma) for Mallnock North. A monzodioritic dike close to Mallnock yielded a U–Pb apatite date of 282 ± 9 Ma and supports the polyphase formation of this mineralization. The U–Pb scheelite ages indicate that a model for tungsten metallogeny in the Eastern Alps must also consider remobilization of tungsten by metamorphic fluids. In the Alps, the Permian to Triassic period (ca. 290–225 Ma) is characterized by an overall extensional geodynamic setting related to the breakup of Pangea. Lithospheric thinning caused higher heat flow, low-P metamorphism, and anatexis in the lower crust, which led to enhanced crustal fluid flow in the upper crust. These processes were not only responsible for the formation of metasomatic hydrothermal magnesite and siderite deposits in the Eastern Alps but also for this unique magnesite-ferberite-scheelite mineralization at Mallnock.

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Scheelite chemistry from skarn systems: implications for ore-forming processes and mineral exploration

Cited by 23 publications

References 102 publications

Texture and Geochemistry of Multi‐stage Hydrothermal Scheelite in the Mamupu Cu‐Au‐Mo(‐W) Deposit, Eastern Tibet: Implications for Tungsten Mineralization in the Yulong Belt

Texture and Geochemistry of Multi‐stage Hydrothermal Scheelite in the Mamupu Cu‐Au‐Mo(‐W) Deposit, Eastern Tibet: Implications for Tungsten Mineralization in the Yulong Belt

Distribution of chalcophile elements during crystallisation and alteration of magmatic Ni-Cu-Co sulfide deposits in the anorthositic Espedalen Complex, Norway: pentlandite as an indicator for tracking metal tenors

Polyphase stratabound scheelite-ferberite mineralization at Mallnock, Eastern Alps, Austria

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