IAG 1999 Regional Conference on Geomorphology
Gloria Hotel of Rio de Janerio, Brasil, July 17-22, 1999
Abstracts - Sandra Baptista da Cunha and Antonio Jose Teixeira Guerra (Eds.)

GEOPEDOLOGICAL SYSTEMS IN THE IBITIPOCA STATE PARK, MINAS GERAIS STATE, BRAZIL

Rocha, G. C. and Zaidan, R. T.

Universidade Federal de Juiz de Fora, MG, Brasil, Geraldo@ichl.ufjf.br


The Ibitipoca State Park , located south of Minas Gerais State in Brasil, preserves important remanescent of the Mata Atlāntica Brasilian ecosystem, showing wonderful geological formations along with endemic vegetational species; both has suffered many environmental impacts due to the turistic actions, because inexist management plans or environmental zoning to disciplinate the visitations. It is showed the model of geopedological systems, a way to study and separate different pedogeoenvironments. The geological history has imprinted differential weathering and tectonic features in the rocks of the park, represented by saccaroidal quartzites, as well as "islands" of mica schist . In the quartzite dominion , the geomorphology is determined by the physical characteristics of the rock, as well as its structural features (tectonic control), originating shallow soils, due to the reduced relation pedogenesis/erosion, and accentuated relief. Litholic and cambic soils occur, predominantly the first ones, with high acidity and poor nutrient status. The schist rock doesn't show structural control on the relief, but instead, a climatic control, with smooth surfaces, originating clayer soils, and a more elevated reason pedogenesis/erosion, with well developed B and C horizons along the geopedological system. Over the schist occurrs cambic soils, with a forest cover that maintains organic horizons at the soil surface, showing also stone lines in the C horizon.


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