Provenance constraints on the Cretaceous-Paleocene erosional history of the Guiana Shield as determined from the geochemistry of clay-size fraction of sediments from the Arapaima-1 well (Guyana-Suriname basin)

Roddaz, Martín; Dera, Guillaume; Mourlot, Yannick; Calvès, Gérôme; Kim, Jung-Hyun; Chaboureau, Anne-Claire; Mounic, Stéphanie; Raisson, François

doi:10.1016/j.margeo.2021.106433

Cited by 11 publications

(2 citation statements)

References 136 publications

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“…The concentrations of REEs, Eu anomalies and selected trace elemental ratios such as Cr/Th, Th/Sc and La/Sc of clastic sediments are widely used as robust tools to determine their provenance, provided that they are not influenced by syn/post‐depositional authigenesis and diagenetic alteration (McLennan et al, 1993; Roddaz et al, 2021). In order to use these provenance proxies, it is necessary to evaluate the effects of late‐stage chemical alteration.…”

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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“…The northward orientation of all of these rivers towards the Atlantic Ocean (Fig. 1) is a product of the tectonic separation of South America and Africa that led to the opening of this ocean during the Cretaceous (Roddaz et al 2021). The geological units of the Guiana Shield are quite diversified, and include granitoids, granites, granulites, gneisses, sandstones, greenstones, mafic intrusions, and dykes ranging in age from Jurassic to Archaean (Kroonenberg et al 2016;Roddaz et al 2021).…”

Section: Regional Setting Of River Mouths On the Guianas Coastmentioning

confidence: 99%

A remote sensing-based classification approach for river mouths of the Amazon-influenced Guianas coast

Gautier

Anthony

Santos³

et al. 2022

Reg Environ Change

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The mouths of the rivers on the 1500-km-long Guianas coast, South America, are strongly influenced by large mud banks migrating alongshore from the Amazon River. To probe this influence, a river-mouth morphological classification scheme was carried out from satellite images, complemented by data from rare previous studies of estuarine hydrodynamics. The classification highlights a variety of morphological and dynamic river-mouth types that are further influenced by both fluvial water discharge and fluvial catchment rock type. Three basic types are identified: (1) river mouths diverted westward by capes and spits built from multi-decadal to multi-millennial accumulation of mud supplied by the Amazon; among these, mouths close to the Amazon are fixed by bedrock surrounded by mud; (2) small river mouths in French Guiana fixed by outcrops of Precambrian rocks that form headlands devoid of Amazon mud; and (3) large river mouths characterized by high water discharge that imparts an orientation normal to the coast; the largest two belonging to this type (the Essequibo in Guyana and the Maroni on the border between French Guiana and Suriname) exhibit infilled mouths that are transitioning towards deltas. These river mouths show a tropical seasonal estuarine circulation regime strongly influenced by Amazon mud. The influence of mud from the distant Amazon constitutes a unique aspect of the river mouths on the Guianas coast. Field and modelling studies in the future will be needed in order to achieve better characterization of the influence of Amazon mud on the estuarine circulation systems and of the distribution of sediment types within these river mouths, including sand supplied by the rivers.

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Geochemistry of marine sediments adjacent to the Los Tuxtlas Volcanic Complex, Gulf of Mexico: Constraints on weathering and provenance

Armstrong‐Altrin

Ramos-Vázquez

Madhavaraju

et al. 2022

Applied Geochemistry

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Provenance constraints on the Cretaceous-Paleocene erosional history of the Guiana Shield as determined from the geochemistry of clay-size fraction of sediments from the Arapaima-1 well (Guyana-Suriname basin)

Cited by 11 publications

References 136 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

A remote sensing-based classification approach for river mouths of the Amazon-influenced Guianas coast

Geochemistry of marine sediments adjacent to the Los Tuxtlas Volcanic Complex, Gulf of Mexico: Constraints on weathering and provenance

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