The mineralogy and petrography of the ferruginous manganese rocks at Mankwadzi, Ghana

Dzigbodi-Adjimah, K.

doi:10.1016/j.jafrearsci.2003.08.001

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…; Nyame ). Melcher () and Djigbodi‐Adjimah (), working in northern Ghana and the Winneba area (southern Ghana), respectively, reported different enrichments and/or paragenesis in similar host rock settings to the Nsuta area.…”

Section: Birimian Mafic Magmatism Vs Metallogeny?mentioning

confidence: 99%

Origins of Birimian (ca 2.2 Ga) mafic magmatism and the Paleoproterozoic ‘greenstone belt’ metallogeny: a review

Nyame

2013

Island Arc

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The Birimian of the West African Craton is an important repository of Paleoproterozoic mafic magmatism, described by many workers as petrologically dominated by basaltic to andesitic rocks. In spite of extensive work done, opinions still differ on the origin and other salient features in these globally significant igneous rocks. Even less well understood is the relationship that may exist between the mafic rocks and prolific metalliferous deposits such as manganese and gold that are hosted in these rocks. This review suggests that the frequently observed association between mafic rocks and important mineral deposits may have far more genetic implications than previously envisaged.

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Section: Birimian Mafic Magmatism Vs Metallogeny?mentioning

confidence: 99%

Origins of Birimian (ca 2.2 Ga) mafic magmatism and the Paleoproterozoic ‘greenstone belt’ metallogeny: a review

Nyame

2013

Island Arc

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“…metamorphosed manganese‐rich sediments). Djigbodi‐Adjimah (2004), however, suggested that these rocks were not typical Birimian Mn deposits but rather have a genetic link with a hornblende dyke due to their proximity. Thus, according to Djigbodi‐Adjimah (2004), the Mankwadzi Mn mineralization resulted from a localized hydrothermal or pyrometasomatic fluid activity followed by regional metamorphism.…”

Section: Introductionmentioning

confidence: 99%

“…Djigbodi‐Adjimah (2004), however, suggested that these rocks were not typical Birimian Mn deposits but rather have a genetic link with a hornblende dyke due to their proximity. Thus, according to Djigbodi‐Adjimah (2004), the Mankwadzi Mn mineralization resulted from a localized hydrothermal or pyrometasomatic fluid activity followed by regional metamorphism. Apart from these two workers, no detailed studies have been done on manganese bearing rocks in the Mankwadzi area to the extent that occurrence of these rocks and their relationship to host hornblende schist and amphibolite are not well known.…”

Section: Introductionmentioning

confidence: 99%

Petrography and geochemistry of manganiferous rocks in the Mankwadzi area in the southern Kibi‐Winneba metavolcanic belt, Ghana: Implications for genesis of Mn formations in the Birimian of West Africa

et al. 2020

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Manganiferous rocks in the Mankwadzi area in the southernmost portion of the Kibi-Winneba metavolcanic belt, one of several Mn occurrences in the Paleoproterozoic Birimian of Ghana, are hosted in hornblende schist and amphibolite. These rocks are, in places, intruded by hornblende dyke. In outcrop, the manganiferous rocks appear to be conformable with the host schist and amphibolite, are macroscopically dark, fine-grained and structurally massive to distinctly banded. Observed alternating light and dark occasionally macro-folded bands suggest post-depositional deformation of both light and dark bands. Microscopic observations revealed that the light bands are dominantly Si-rich and the dark bands mainly of opaque minerals. Whole rock analyses of the manganiferous rocks show high contents of MnO (16.75-27.4 wt%) suggesting that the opaque minerals are likely rich in Mn. The analyzed rock samples show moderate to strong enrichments in light rare earth elements compared to heavy rare earth elements. Whereas the manganiferous rocks show perceptibly negative Eu anomaly, host hornblende schist and hornblende dyke do not. Eu anomaly in amphibolite samples is, however, uncertain as the three samples analyzed gave positive, negative and no Eu anomalies. Based on the field characteristics, microscopic and geochemical features, we suggest that the Mn occurrence in the Mankwadzi area originated via sedimentary deposition and was later modified by metamorphism, hydrothermal and/or supergene processes similar to manganiferous occurrences at Nsuta and Tambao in the Birimian of West Africa.

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“…According to Milesi et al (1992), it is still unclear whether the manganese deposits have a predominantly sedimentary/exhalative origin due to chemical precipitation from hydrothermal fluids. Recently, Djigbodi-Adjimah (2004) described the mineralogy and petrography of Birimian ferruginous manganese rocks at Mankwadzi within the Kibi-Winneba belt of Ghana and suggested that these may not be typical Birimian Mn deposits.…”

Section: Introductionmentioning

confidence: 99%

Petrography and geochemistry of intraclastic manganese–carbonates from the ∼2.2Ga Nsuta deposit of Ghana: Significance for manganese sedimentation in the Palaeoproterozoic of West Africa

Nyame

2008

Journal of African Earth Sciences

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The mineralogy and petrography of the ferruginous manganese rocks at Mankwadzi, Ghana

Cited by 11 publications

References 22 publications

Origins of Birimian (ca 2.2 Ga) mafic magmatism and the Paleoproterozoic ‘greenstone belt’ metallogeny: a review

Origins of Birimian (ca 2.2 Ga) mafic magmatism and the Paleoproterozoic ‘greenstone belt’ metallogeny: a review

Petrography and geochemistry of manganiferous rocks in the Mankwadzi area in the southern Kibi‐Winneba metavolcanic belt, Ghana: Implications for genesis of Mn formations in the Birimian of West Africa

Petrography and geochemistry of intraclastic manganese–carbonates from the ∼2.2Ga Nsuta deposit of Ghana: Significance for manganese sedimentation in the Palaeoproterozoic of West Africa

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