Editors: Francisco Gutiérrez, Mateo Gutiérrez, Gloria Desir, Jesús Guerrero, Pedro Lucha, Cinta Marín, José María García-Ruiz

BOULET, R.

COLTRINARI, L.

FILIZOLA, H. F.

GOMES, M. A. F.

English

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Sixth International Conference on Geomorphology. Zaragoza, 2005Landform evolution in the headwaters area of Araguaia river (Mato Grosso and Goiás states,Brazil)H.F. FILIZOLA (1)*, L. COLTRINARI(2), M.A.F. GOMES (1)and R. BOULET(3)(l) Lab. de Qualidade do Solo, Embrapa Meio Ambiente, Jaguariúna SP Brazil <2) Depto. de Geografia, FFLCH, USP, São Paulo SP Brazil (3) Nupegel, ESALQ, USP, Piracicaba, SP Brazil *corresponding author e-mail: filizola@cnpma.embrapa.brJurassic-Cretaceous basaltic sheets of Serra Geral Formation where traps and sandstone intertraps overlay large areas of Botucatu Formation sandstones exposures are the main lithologic units in the upper section of Araguaia river basin. These pinkish to reddish, fme-to-very fine textured, and well-selected aeolian rocks show small-to- medium cross-stratification structures. Over the Mesozoic basement were modelled extensive land forms known in central-western Brazil as chapadões, large horizontal to undulating plateaus edged by well-defined scarps from which flat-topped buttes are observed. Chapadões are the remnants of large structural surfaces located above 850 m a.s.l. where landforms and Ferralsols (Red and Yellow-Red Latossols) relate to in situ pedogenesis of basaltic rocks and drainage systems are practically absent. Around the chapadões scarps =40m medium height evolve by retreat leaving behind them restricted planation surfaces with low gradient to ondulating relief (750 -  800 m a.s.l.) originated by reworking of soil and rock debris eroded from the chapadão. Many low-order streams flow over minor scarps (~ 20m) or high-gradient slopes circumscribing the second surface. Remnants of the second surface were identified in a lower planated level or third surface.Keywords: Structural surfaces; Ferralsols; Pedogenesis; Morphogenesis; Latossolos184

Landform evolution in the headwaters area of Araguaia river (Mato Grosso and Goiás states, Brazil).

http://www.alice.cnptia.embrapa.br/bitstream/doc/1021694/1/2005RA139.pdf

Landform evolution in the headwaters area of Araguaia river (Mato Grosso and Goiás states, Brazil).

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