Evolution of the magmatic-hydrothermal system at the Erdenetiin Ovoo porphyry Cu-Mo deposit, Mongolia: constraints on the relative timing of alteration and mineralization

Monecke, Thomas; Reynolds, T. James; Gonchig, Tsolmon; Batbayar, Natsagdorj

doi:10.1007/s00126-023-01221-8

Miner Deposita

2023

DOI: 10.1007/s00126-023-01221-8

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Evolution of the magmatic-hydrothermal system at the Erdenetiin Ovoo porphyry Cu-Mo deposit, Mongolia: constraints on the relative timing of alteration and mineralization

Thomas Monecke,

T. James Reynolds,

Tsolmon Gonchig

et al.

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2024

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Cited by 2 publications

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Quartz fluid inclusions and trace elements in the Lailisigaoer porphyry Mo deposit, Western Tianshan, Xinjiang: Fluid evolution and metallogenic mechanism in magmatic-hydrothermal system

Wang,

Zhang,

Zhang

et al. 2024

Ore Geology Reviews

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Quartz fluid inclusions and trace elements in the Lailisigaoer porphyry Mo deposit, Western Tianshan, Xinjiang: Fluid evolution and metallogenic mechanism in magmatic-hydrothermal system

Wang,

Zhang,

Zhang

et al. 2024

Ore Geology Reviews

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MINERAL PARAGENESIS OF EARLY BIOTITE VEINS AT THE KUH-E JANJA Cu-Au PORPHYRY DEPOSIT, SOUTHEASTERN IRAN: IMPORTANCE OF MICROTEXTURAL OBSERVATIONS IN STUDIES CONSTRAINING THE RELATIVE TIMING OF HYPOGENE Cu MINERALIZATION

Soleymani,

Monecke,

James Reynolds

et al. 2024

Economic Geology

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Veins consisting primarily of biotite are the earliest stockwork vein type recognized at the Kuh-e Janja Cu-Au porphyry deposit in southeastern Iran. These early biotite veins may contain quartz and minor amounts of sulfide minerals such as chalcopyrite and pyrite. Observations at the hand-specimen scale do not provide reliable constraints on the paragenetic relationships, as the early biotite veins have been repeatedly overprinted during the evolution of the magmatic-hydrothermal system. Microscopic investigations show that the sulfide minerals in the early biotite veins are texturally late, providing evidence that sulfide deposition did not occur at the high temperatures of biotite formation and potassic alteration of the host rocks. Chalcopyrite primarily occurs along hairline fractures that crosscut or refracture the earlier biotite veins. Biotite in contact with the chalcopyrite can be apparently unaltered or is replaced by chlorite, depending on the degree of wall-rock buffering of the magmatic-hydrothermal fluids that caused hypogene Cu mineralization. The findings add to the growing body of evidence that Cu mineralization in this deposit type occurs at temperatures close to the transition from ductile to brittle conditions (<450°C) following a drop in the pressure regime from lithostatic to hydrostatic conditions.

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Evolution of the magmatic-hydrothermal system at the Erdenetiin Ovoo porphyry Cu-Mo deposit, Mongolia: constraints on the relative timing of alteration and mineralization

Cited by 2 publications

References 81 publications

Quartz fluid inclusions and trace elements in the Lailisigaoer porphyry Mo deposit, Western Tianshan, Xinjiang: Fluid evolution and metallogenic mechanism in magmatic-hydrothermal system

Quartz fluid inclusions and trace elements in the Lailisigaoer porphyry Mo deposit, Western Tianshan, Xinjiang: Fluid evolution and metallogenic mechanism in magmatic-hydrothermal system

MINERAL PARAGENESIS OF EARLY BIOTITE VEINS AT THE KUH-E JANJA Cu-Au PORPHYRY DEPOSIT, SOUTHEASTERN IRAN: IMPORTANCE OF MICROTEXTURAL OBSERVATIONS IN STUDIES CONSTRAINING THE RELATIVE TIMING OF HYPOGENE Cu MINERALIZATION

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