Geochemistry of basalts in unravelling the mantle processes and crustal evolution: Insights from the greenstone belts of western Dharwar Craton

Manikyamba, C.; Pahari, Arijit; Santosh, M.; Subramanyam, K.S.V.; Reddy, G. Harshitha

doi:10.1016/j.geogeo.2022.100070

Cited by 5 publications

(2 citation statements)

References 94 publications

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“…(a) Al 2 O 3 versus TiO 2 plot where the Sandur and Chitradurga clays indicate their predominantly felsic provenance (after Ekosse, 2001); (b) Zr/Sc versus Th/Sc plot displaying a varied source for the studied clays and (c) Th versus La plot after McLennan (1989) indicating the origin of studied clays from a mixed tonalite–trondhjemite–granodiorite (TTG), felsic and mafic source. Fields of TTG of Dharwar Craton are after Jayananda et al (2015), Chitradurga andesite (CA), basalt (CB) and granite (CG) are from Manikyamba et al (2021, 2022) and Ram Mohan et al (2022); Sandur volcanics are from Harshitha Reddy et al (2023), Manikyamba et al (2008) and Manikyamba and Naqvi (1997), respectively. SB, Sandur basalts; SK, Sandur komatiites; SR, Sandur rhyolites.…”

Section: Discussionmentioning

confidence: 99%

Manganiferous clays of Dharwar Craton, southern peninsular India: Insights on Archean weathering and ore formation processes

Harshitha,

Manikyamba,

Sridhar

et al. 2023

Geological Journal

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Vast clay deposits of Chitradurga and Sandur greenstone belts of the Dharwar Craton, southern peninsular India, hosting pockets of high‐grade manganese (Mn) ore, provide remarkable clues related to the ore‐forming processes and palaeo‐environmental conditions. In this study these Fe–Mn‐rich clays were investigated through mineralogical and geochemical characteristics to comprehend their palaeo‐weathering and genetic constraints and their role in the supergene accumulation of Mn ore. Their mineralogy is characterized by predominant kaolinite, muscovite, birnessite, haematite, goethite, halloysite along with quartz and traces of ilmenite. Chemical indices of alteration and weathering indicate intense weathering conditions under high palaeo‐precipitation rates in a humid, tropical climate under shallow burial conditions and K‐metasomatism. The presence of authigenic kaolinite and absence of illite reflect on diagenesis up to mesodiagenetic stage. Positive to negative Ce anomalies (Ce/Ce* = 0.67–5.93) of these clays suggest varying oxic‐anoxic conditions during their genesis, whereas conspicuous negative Eu anomalies (Eu/Eu* = 0.61–0.99) are attributed to precursor sediment signatures and hydrothermal imprints of the Mn ore. These kaolinite‐rich clays are suggested to have been formed by in situ chemical alteration, whereas kaolinitization of the Fe–Mn‐rich arenaceous and argillaceous sediments was derived from predominant tonalite and felsic provenance in a shallow marine passive margin setting. Based on the morphologies of birnessite, haematite and goethite in the investigated clays, we propose that these clays have played a key role in the oxidation and deposition of Mn (II) from the migrating aqueous solutions and acted as organo‐polymerization templates for the proliferation of ancient microbial life on the planet Earth.

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Section: Discussionmentioning

confidence: 99%

Manganiferous clays of Dharwar Craton, southern peninsular India: Insights on Archean weathering and ore formation processes

Harshitha,

Manikyamba,

Sridhar

et al. 2023

Geological Journal

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“…whole rock geochemistry. As we all know, rock is a product of crystallization differentiation of magma in a magma chamber or/and aisle (e.g., Manikyamba et al, 2022). Hence it could not represent the composition of primary magma.…”

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Magma Chamber Process of Post‐collisional Magmatism: Insight from Textural and Elemental Characteristics of Plagioclase from the Tatun Volcanic Group, Northern Taiwan Volcanic Zone

Xia

Guo

Jiang

et al. 2022

Acta Geologica Sinica (Eng)

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Archean crustal evolution and craton formation in peninsular India: new insights from the Singhbhum, Dharwar and Bastar Cratons

Manikyamba,

Upadhyay,

Mohan

2024

Proc.Indian Natl. Sci. Acad.

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Geochemistry of basalts in unravelling the mantle processes and crustal evolution: Insights from the greenstone belts of western Dharwar Craton

Cited by 5 publications

References 94 publications

Manganiferous clays of Dharwar Craton, southern peninsular India: Insights on Archean weathering and ore formation processes

Manganiferous clays of Dharwar Craton, southern peninsular India: Insights on Archean weathering and ore formation processes

Magma Chamber Process of Post‐collisional Magmatism: Insight from Textural and Elemental Characteristics of Plagioclase from the Tatun Volcanic Group, Northern Taiwan Volcanic Zone

Archean crustal evolution and craton formation in peninsular India: new insights from the Singhbhum, Dharwar and Bastar Cratons

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