Chapada Diamantina: A Remarkable Landscape Dominated by Mountains and Plateaus

Abstract

Chapada Diamantina is located in the central portion of Bahia state in northeastern Brazil and is marked by mountainous relief with pronounced scarps, deep valleys, and high plateaus. Lithologically, this region is dominated by metasedimentary rocks formed over a period of 900 million years during the Proterozoic. Between 500 and 600 million years ago, the last major tectonic event raised the sedimentary package in a sequence of alternating synclinal and anticlinal folds that are cut by faults in several directions. This arrangement, combined with the current fluvial system, has resulted in a relief marked by flattop elevations that reach over 1,800 m in altitude. Two major geomorphological domains are observed at Chapada Diamantina. The karstic domain is dominated by flat relief and slightly undulating terrain. The main features include collapse sinkholes and caves that extend into galleries for up to tens of kilometers. The lithostructural domain consists mainly of quartzite rocks and is divided into three subdomains: (1) Rio de Contas in the western portion, with a very irregular relief and marked by lowered anticlines and hanging synclines with centers emptied by differential erosion, which exposes its flanks in hogbacks; (2) Paraguaçu in the eastern portion, where the flank of a large anticline that is raised and slightly inclined toward the east predominates, and (3) Central Pediplain in the central-southern portion (marked by flat to hilly terrain with some residual elevations). In addition to fluvial morphodynamics, several anthropogenic features have developed over the past 200 years from mining activity.

Preliminary experimental data on surface runoff and soil loss in the Caatinga

“…Conservative practices also reduce soil loss. The cactus palm plots in this study registered 53% lower soil loss compared with previous studies carried out with the same cultivar (de Lima & Nolasco, 2015; Santos et al, 2007; Xavier, 2016). The difference in results is attributed to the effectiveness of transversal and level planting of the palm in reducing surface runoff and erosion, especially in years of lower rainfall.…”

Integrative approach reveals a new species of Nematocharax (Teleostei: Characidae)

“…The Diamantina Plateau belongs to the northern region of the Espinhaço Range and harbours headwaters of several drainages, including the Contas River. This area encompasses the highest altitudes in north‐eastern Brazil (up to 2,033 m), with pronounced scarps, deep valleys and high plateaus (Lima & Nolasco, ). Although the Diamantina Plateau is inserted in the Caatinga biome, its vegetation is quite heterogeneous, with a predominance of dense shrubby arboreal caatinga and rupestrian grassland in the upper portion of the Contas River (Juncá et al ., ).…”

Caves, Karst Features and Speleological Heritage in Chapada Diamantina, Bahia, Brazil

“…As evidence of its relevance, the three largest summits in northeastern Brazil are located here: Barbado, at 2,033 m, Itobira, at 1,970 m, and Almas, at 1,958 m (GIUDICE, 2012); and most of the main rivers of the state of Bahia are born in this region. Lima and Nolasco (2015) propose two main geomorphological domains for Chapada Diamantina: the karstic domain and the lithostructural domain. This subdivision was determined by geological features, such as lithology and structures that affect these rocks.…”