000			02987nab a2200289 i 4500
003			BR-BrBNA
005			20250318130234.0
008			250318b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aP33
072			_aP32
100			_aMateus, Ana Carolina Campos
100			_aVarajão, Angélica Fortes Drummond Chicarino
100			_aOliveira, Fábio Soares de
100			_aPetit, Sabine
100			_aSchaefer, Carlos Ernesto Gonçalves Reynaud
245			_aNon-allophanic Andosols of Trindade Island, south Atlantic: a new soil order in Brazil
500			_aPublicação on-line; 7 illus; 6 tables; Sumaries (En); Bibliography p. 1 - 18
520			_a 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 Vulcão do Paredão (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 presence of Andosols in this oceanic island. Profiles P1 and P2 are developed on pyroclastic bombs, and show, respectively, A-Bi- C and decapitated A-C horizons, whereas P3 and P4 are developed on lapillitic and bomb pyroclasts, show A-C horizons. The soil profiles have a reddish and brownish clayey matrix, are highly friable and show a plastic consistency. Their microstructures are granular, single grain and intergrain microaggregate, in which aggregates display an undifferentiated b-fabric. The mineralogical constituents of the bulk fraction are biotite, hematite, magnetite, ilmenite, pyroxene, olivine, halloysite, goethite, anatase, and rutile. The clay fraction is marked by the presence of halloysite, ferrihydrite, and little amounts of allophane. All soils presented andic properties and can be classified as non-allophanic Andosols. In addition, micromorphological features closely resemble those reported in Andosols from other volcanic islands from elsewhere. The predominance of halloysite in the clay fraction formed by alteration of sideromelane, suggests that allophane would be an intermediate phase of this rapid transformation favored by the wet climate conditions of the highest parts of TI. Keywords: volcanic island, Andic properties, Andisols, halloysite.
650			_aCLASSIFICAÇÃO DO SOLO
650			_aANÁLISE DO SOLO
650			_aPROPRIEDADE FÍSICO-QUÍMICA
773	0		_0808 _9345421 _dViçosa-MG Sociedade Brasileira de Ciência do Solo 1977 _o2024-5955 _tRevista Brasileira de Ciência do Solo (Brazil) _x0100-0683 _gv. 44 p. 1-22; (2020) _wBR2024004903
856			_uhttps://www.scielo.br/j/rbcs/a/3mXnZGzJPFFm5Fs4jrz7yKb/?format=pdf&lang=en
942			_cANA
999			_c330487 _d330487