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Volcanic ash, ash soils and the inferred Quaternary climate of Sub-Antarctic Marion island

GRIBNITZ, K. H ; KENT, L. E ; DIXON, R. D

South African journal of science, 1986, Vol.82 (11), p.629-635 [Periódico revisado por pares]

Pretoria: Foundation for Research Development

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  • Título:
    Volcanic ash, ash soils and the inferred Quaternary climate of Sub-Antarctic Marion island
  • Autor: GRIBNITZ, K. H ; KENT, L. E ; DIXON, R. D
  • Assuntos: Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Marine ; Marine and continental quaternary ; Surficial geology
  • É parte de: South African journal of science, 1986, Vol.82 (11), p.629-635
  • Notas: ObjectType-Article-1
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    ObjectType-Feature-2
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  • Descrição: Field investigations and mineralogical and geochemical studies show that the soils developed in Holocene falls of volcanic ash and not by chemical weathering of the basaltic lavas as averred by previous investigators. Major-oxide analyses are given of Holocene ashes and scoria and of tuffs lying between Pleistocene lava flows. Fifteen trace elements were also determined. The analyses, the first of wind-borne pyroclastics from the island, are compared with those of the lavas. The Holocene ash consists of labradoritic feldspar, augite, pigeonite and glass. The glass shows signs of alteration, but clay minerals were not detected; the included ore minerals are altering to iron oxides/hydroxides. The red layer lying between Pleistocene lava flows at Macaroni Bay is a tuff and not a soil supposedly formed during a warm interglacial. The dating of Quaternary climatic changes based on an assumed uniform rate of accumulation of peaty deposits in a mire is questioned. An erosion cycle in rivers may reflect Holocene climatic changes.
  • Editor: Pretoria: Foundation for Research Development
  • Idioma: Inglês
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