Analysis of colluvium deposits in Serra dos cavalos – Caruaru / Pernambuco

Abstract

The present work aims to analyze two colluvium deposits in Serra dos Cavalos/PE, in an attempt to understand and/or correlate the geomorphological dynamics in this Altitude Brejo which has elements of biodiversity and geodiversity distinct from the surrounding areas. For this, a bibliographic survey, office work, field work and laboratory activities were carried out. The study area is located in the Planalto da Borborema and morphostructurally classified as the Pernambuco-Alagoas Structural Summit, specifically in the area belonging to the municipality of Caruaru/PE. Based on the sedimentological analysis, the two points have a sediment matrix classified as siltic sand and sandy silt. The grains for sediment selection were very poorly selected. Asymmetry ranged from very negative to positive. Kurtosis, a measure of the flattening of the particle size distribution curve in relation to the normal curve, was classified as very platykurtic (flat) and the environment presented a very high hydrodynamics. Thus, the colluvial sediments were derived from the remobilization of the eluvial mantles of alteration of the crystalline basement, through a high hydrodynamics, that is, a nearby source area and small crawls. The data presented here offer unprecedented results and can be used for planning and environmental and territorial management.