Precipitation of Mississippi Valley-type ores

Anderson, G. M.

doi:10.2113/gsecongeo.70.5.937

Cited by 139 publications

(66 citation statements)

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“…This would have resulted in a pH increase and was probably the principal mechanism for mineral precipitation (cf. Anderson, 1975). The large amounts of quartz (Tdependent solubility) in the veins also indicate a drop in the temperature of hydrothermal fluids (Fournier, 1985).…”

Section: Discussionmentioning

confidence: 99%

Mineralogical and textural evolution of the economic manganese mineralisation in western Rhodope massif, N. Greece

Nimfopoulos

Pattrick

1991

Mineral. mag.

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The western Rhodope massif contains a significant number of 'battery grade' Mn-oxide deposits which are best developed in the area near Kato Nevrokopi, Drama district, N. Greece. Economic Mn-oxide ore concentrations are confined to fault zones and related karsts in marbles. The mineralisation has formed by weathering of hydrothermal veins that were genetically related to Oligocene magmatism.At Kato Nevrokopi, progressive and continuous weathering of primary, hydrothermal veins of rhodochrosite, mixed sulphide, quartz and 'black calcite' (calcite and todorokite) has resulted in the formation of the assemblage MnO-gel-(amorphous Mn-oxide)-todorokite-azurite-goethite-cerussite in the veins and the assemblage MnO-gel-nsutite--chalcophanite-birnessite-cryptomelane-pyrolusite and malachite and amorphous Fe-oxides in karstic cavities.The fs2 andfo2 of the hydrothermal fluids increased with time. The breakdown of the hypogene Mncarbonate was aided by the production of an acidic fluid due to the oxidation of sulphides. Precipitation of the supergene ores was caused by neutralisation of the fluids due to reaction with the host marble and to mixing of relatively reduced fluids with oxygenated surface water in a fluctuation water table regime. Zinc was also mobile during weathering and became concentrated in the intermediate Mn-oxides, effectively stabilising their structures. The mineral paragenesis records the progressive oxidation of the ore and the appearance of less hydrated Mn-oxides, low in alkalis and alkaline earths.

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Section: Discussionmentioning

confidence: 99%

Mineralogical and textural evolution of the economic manganese mineralisation in western Rhodope massif, N. Greece

Nimfopoulos

Pattrick

1991

Mineral. mag.

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“…12A, C and D). Host-rock dissolution during the deposition of metal in MVT and other carbonatehosted deposits has been widely documented, as the dissolution and hydrothermal brecciation of the host rocks can be caused by acid-producing reactions commonly associated with fluid mixing (Anderson, 1975;Sverjensky, 1984Sverjensky, , 1986. However, it is difficult to maintain these reactions as the gradually stronger acid solution will not only provide the preservation place but also dissolve the sulfides formed earlier.…”

Section: Mineralization and Associated Ore-forming Fluids Of Stage IImentioning

confidence: 99%

Ore geology and fluid evolution of the giant Caixiashan carbonate-hosted Zn–Pb deposit in the Eastern Tianshan, NW China

Chen

Zhang

et al. 2016

Ore Geology Reviews

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“…3 Li et al, 1999;Hu, 2000;Huang et al, 2001;Zhang 2006). Because geological setting, host rocks, mineral assemblages and the features of ore fluid and isotopic compositions are similar to MVT deposits (Anderson, 1975;Sverjensky, 1981Sverjensky, , 1986Bethke and Marshak, 1990;Leach and Sangster, 1993;Leach et al, 2001), the Huize ore field is here considered to be typical of a MVT ore field.°4 …”

Section: Geologymentioning

confidence: 99%

Isotope geochemistry of the Huize Zn-Pb ore field, Yunnan Province, Southwestern China: Implication for the sources of ore fluid and metals

Huang

Yin

2007

Geochem. J.

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The Huize ore field, which is the most famous high-grade Zn-Pb ore field in China, comprises the Kuangshanchang and Qilinchang deposits. The Zn and Pb reserves of these two deposits are more than 5 Mt with ore grades ranging from 25% to 35% in weight. Lead, sulfur, carbon, oxygen, hydrogen and strontium isotope geochemistry is reported to help understand the sources of the ore fluid and metals. Sr values may be due to the reaction between the ore fluid and the shale, clastic rocks and mudstone underlying the host rock or the fluid might have originated from these rocks.

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Precipitation of Mississippi Valley-type ores

Cited by 139 publications

References 0 publications

Mineralogical and textural evolution of the economic manganese mineralisation in western Rhodope massif, N. Greece

Mineralogical and textural evolution of the economic manganese mineralisation in western Rhodope massif, N. Greece

Ore geology and fluid evolution of the giant Caixiashan carbonate-hosted Zn–Pb deposit in the Eastern Tianshan, NW China

Isotope geochemistry of the Huize Zn-Pb ore field, Yunnan Province, Southwestern China: Implication for the sources of ore fluid and metals

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