Authigenic and detrital clay minerals as indicators of paleoenvironmental and postdepositional evolution in a Cretaceous–Cenozoic succession from Argentine Central Andes

Wunderlin, Cecilia A.; Collo, Gilda; Ezpeleta, Miguel; Carbonell, Virginia V. Reinoso; Nóbile, Julieta C.; Ciccioli, Patricia L.; Faudone, Sonia Nerina

doi:10.1016/j.sedgeo.2022.106179

Cited by 3 publications

(2 citation statements)

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“…during diagenesis (eodiagenesis), mineral transformation, dissolution and re-precipitation mechanisms, and circulation patterns of diagenetic/hydrothermal fluids (mesodiagenesis or telodiagenesis; Meunier, 2005;Wunderlin et al, 2022).…”

Section: Sandur Beltmentioning

confidence: 99%

“…Thus, careful assessment of the mineralogy and geochemistry of the clay fraction of a sedimentary terrane yields information that is fundamental in understanding the palaeo‐weathering regimes present within the continental interior. This includes provenance and in turn the crustal architecture of a sedimentary basin, palaeoclimate and the depositional processes during diagenesis (eodiagenesis), mineral transformation, dissolution and re‐precipitation mechanisms, and circulation patterns of diagenetic/hydrothermal fluids (mesodiagenesis or telodiagenesis; Meunier, 2005; Wunderlin et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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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: Sandur Beltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%