Manganese nodules in the Miocene Bahía Inglesa Formation, north-central Chile: Petrography, geochemistry, genesis and palaeoceanographic significance

Achurra, L.E.; Lacassie, Juan Pablo; Roux, J.P. Le; Marquardt, Carlos; Belmar, Mauricio; Ruiz‐del‐Solar, Javier; Ishman, Scott E.

doi:10.1016/j.sedgeo.2009.03.016

Cited by 31 publications

(18 citation statements)

References 32 publications

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“…However, on the transect defined in the study area, two profiles were classified as Cambisols, two soils identified as red-yellow Argisols and one as a red Argisol. Given the negligible changes in the other factors of formation, this would suggest that changes in source material are influencing this variability, also been reported by other authors (ACHURRA et al, 2009;ALENCAR, 2002;MOTA et al, 2007).…”

Section: Genesis and Morphologysupporting

confidence: 72%

Soil genesis and iron nodules in a karst environment of the Apodi Plateau

Girão¹,

Moreira²,

Girão³

et al. 2014

Rev. Ciênc. Agron.

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-The Apodi Plateau, located in the northeastern part of the state of Ceará in Brazil, has limestone as its parent material, with significant variation in the soils formed in this region, as well as the presence of iron nodules, having been identified. The iron oxides have been used as indicators for evaluating the weathering processes of some soils, with the nodules being sources of information about pedogenic processes. Seeking to evaluate the influence of the karstic parent material and of the iron nodules on soil genesis in the Apodi Plateau, the morphological, physical and chemical properties of five profiles were evaluated, as well as of the iron nodules present in some horizons. The profiles were classified as RED-YELLOW ARGISOL Abruptic eutrophic plinthosol (P1), Tb HAPLIC CAMBISOL Eutrophic latosol (P2), RED-YELLOW ARGISOL Abruptic eutrophic plinthosol (P3), Tb HAPLIC CAMBISOL Eutrophic latosol (P4) and RED ARGISOL Eutrophic nitosol (P5). Changes in chemical, physical and morphological characteristics were observed at depth in some profiles, suggesting variation in the characteristics of the parent material. Nodules of class C1 (0.053 to 0.25 mm) and C2 (0.25 to 2.00 mm) were concentrated on the surface, alternating with a sub-surface concentration of class C3 (2.00 to 4.76 mm), C4 (4.76 to 7.90 mm) and C5 (7.90 to 19.1 mm). Profile P5, considered as more evolved, showed a predominance of classes C1, C2 and C3 in the surface horizons, indicating degradation of the larger-diameter nodules with the advancing weathering process.

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Section: Genesis and Morphologysupporting

confidence: 72%

Soil genesis and iron nodules in a karst environment of the Apodi Plateau

Girão¹,

Moreira²,

Girão³

et al. 2014

Rev. Ciênc. Agron.

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show abstract

“…1). This locality is part of a broad exposure called Los Negros, within the Bahía Inglesa Formation (Rojo, 1985; middle Miocene-late Pliocene, based on the work of Achurra, 2004;Achurra et al, 2009). Phocids are from the same level that has produced a tarsometatarsus referred to the penguin Pygoscelis grandis (SGO.PV 1104).…”

Section: Geologic Contextmentioning

confidence: 99%

Pinniped turnover in the South Pacific Ocean: new evidence from the Plio-Pleistocene of the Atacama Desert, Chile

Valenzuela‐Toro

Gutstein

Varas-Malca

et al. 2013

Journal of Vertebrate Paleontology

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“…The average size of the nodules appears to be around 30 cm with a growth rate that differs starting about 1-200 million years with a regular assortment of 3-4 mm/ my (Achurra et al 2009). Pertaining to the spatial allocation of manganese nodules on the seabed, the researchers reveal that the Mn nodules seem to have a structure which can be as small as golf balls or as big as large potatoes.…”

Section: Occurrence and Resourcesmentioning

confidence: 99%