Abstract
ABSTRACT The pedological studies carried out so far in Trindade Island (TI) have obtained patchy evidences of allophane, without detailed mineralogical and micromorphological studies to confirm the occurrence of Andosols in TI. Therefore, in this study, the mineralogical, micromorphological, physical and chemical characterization of four soil profiles from Vulcao do Paredao (P1) and Morro Vermelho formations (P2, P3, and P4) were carried on the latest volcanic events in Brazil from Trindade Island (TI) with the aim of to evaluate the [...]
Highlights
The soils formed from tephras or pyroclastic materials are known as Andisols (Soil Survey Staff, 2014), Andosols (IUSS Working Group WRB, 2015), and Kurobokudo (USCSJ, 2002)
Profile 2 (P2), is 1.20 m thick, located at 351 m on deposit of pyroclastic bombs, and has lost most of its A horizon; P3, at an elevation of 258 m, is approximately 1.00 m thick and shows A, C1 and C2 horizons, with 0.10 m layer of lapillitic pyroclasts between C1 and C2; P4 has a thickness of 0.57 m, located at an elevation of 72 m, with a sequence of A, C1, and C2 horizons
The soils of Trindade Island (TI) present andic properties and should be classified as Andosols, and meeting the criteria to be classified as non-allophanic Andosols
Summary
The soils formed from tephras or pyroclastic materials are known as Andisols (Soil Survey Staff, 2014), Andosols (IUSS Working Group WRB, 2015), and Kurobokudo (USCSJ, 2002). The Andosols are characterized by the presence of allophane or Al, Si, and humus compounds (Shoji et al, 1993). The andic properties of a soil are generally acquired during weathering of tephra or other parent materials which contain significant volcanic glass, leading to the formation of amorphous material as allophane, imogolite, ferrihydrite, or metal-humus complexes. The andic soil properties may be inferred by using 1N sodium fluoride (NaF) (Soil Survey Staff, 2014). This test may not be specific for allophane as it may reacts with A1 in Al-humus complexes (Parfitt, 1990)
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