Goethite and hematite in a climosequence in southern Brazil and their application in classification of kaolinitic soils

doi:10.1016/0016-7061(83)90028-9

Geoderma

Volume 29, Issue 1, January 1983, Pages 27-39

https://doi.org/10.1016/0016-7061(83)90028-9 Get rights and content

Abstract

The goethite/hematite + goethite ratio of 11 profiles of Oxisols, Ultisols and Inceptisols along a 600 km E-W transect in S. Brazil varied systematically with climatic and soil factors. The ratio increased with decreasing mean annual air temperature, increasing excess moisture (rainfall minus evapotranspiration), increasing soil organic carbon and decreasing pH. This is explained in light of the current concept of goethite and hematite formation in soils: higher temperatures favor hematite, whereas higher excess moisture, higher organic carbon and lower pH favor goethite. A basis is suggested for using goethite and hematite in the mineralogical classes at the family level of Soil Taxonomy.

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Late Cenozoic changes in the intensity of the East Asian Summer Monsoon (EASM) are reconstructed using both terrestrial and marine proxy records; however, proxies from terrestrial (e.g., loess, pollen, and pedogenic isotopes) and marine environments (e.g., foraminifer assemblages and geochemistry) commonly display large discrepancies both in the direction and timing of changes in the EASM. In part, these discrepancies reflect long-term changes in paleogeography that are independent of climate variations. We assess the influence of a rapidly uplifting orogen on EASM records by comparing temporally constrained gamma-ray, δ¹³C_org, hematite/goethite, and magnetic susceptibility records from Late Miocene–Early Pleistocene strata of the Taiwan Western Foreland Basin to time-equivalent EASM proxy records in the South China Sea (SCS).
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Our results show that a rapidly uplifting orogen has the potential to significantly impact paleoclimate records >1000 km away from the collision zone. This highlights the influence of shifting sediment sources on paleoclimate proxy records, which must be considered in interpreting past climate change from the sedimentary record.
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Goethite and hematite in a climosequence in southern Brazil and their application in classification of kaolinitic soils

Abstract

Geoderma

Geoderma

Iron oxide mineralogy of well-drained Ultisols and Oxisols. II. Influence on color, surface area, and phosphate retention

Soil Sci. Soc. Am J.

Levantamento de reconhecimento dos solos do Estado do Rio Grande do Sul

Min. Agric., DNPA, DPP Bol. Técn.

Les facteurs et les mécanismes de la pédogenèse dans les sols rouges et jaunes ferrallitiques sur sables et grès en Afrique

Cah. ORSTOM, Sér. Pédol.

Ferrallitic pedogenesis on metamorphic rocks, SW-Nigeria

Pédologie

A crystallinity index for soil kaolins and its relation to parent rock, climate and soil maturity

J. Soil Sci.

Die Eisenoxidmineralogie einer Klimasequenz von Böden aus Eruptiva in Rio Grande do Sul, Brasilien

The 5M NaOH concentration method for iron oxides in soils

Clays Clay Miner

Quantitative determination of goethite and hematite in kaolinitic soils by X-ray diffraction

Clay Miner.

Etat et comportement du fer dans les sols formés sur roches carbonatées au Liban

Sci. Sol.

Iron oxide removal from soils and clays by a dithionite-citrate system buffered with sodium bicarbonate

Recherches géochimiques sur les éléments de transition dans les sols; Etude expérimentale de l'influence des éléments traces sur le comportmente du fer et l'évolution des composés ferriféres au cours de la pédogénése

The isomorphous replacement of iron by aluminium in soil goethites

J. Soil Sci.