Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-03T21:15:21Z No. of bitstreams: 1 OrildoDeLimaESilva_DISSERT.pdf: 10653683 bytes, checksum: a0aad2b3ae9ff3382f46da744b549427 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-07T22:08:14Z (GMT) No. of bitstreams: 1 OrildoDeLimaESilva_DISSERT.pdf: 10653683 bytes, checksum: a0aad2b3ae9ff3382f46da744b549427 (MD5) / Made available in DSpace on 2017-04-07T22:08:14Z (GMT). No. of bitstreams: 1 OrildoDeLimaESilva_DISSERT.pdf: 10653683 bytes, checksum: a0aad2b3ae9ff3382f46da744b549427 (MD5) Previous issue date: 2016-08-23 / Este estudo teve seu foco em dados de superf?cie e sub-superf?cie rasa, permitindo a caracteriza??o da evolu??o recente do carste epig?nico em quatro est?gios. Durante o Est?gio 1 as fraturas foram abertas pelo processo de dissolu??o, as quais formaram caminhos verticais em escala centim?trica ? m?trica. O conjunto mais abrangente de fraturas concentra a dissolu??o. Ao longo de camadas horizontais intersectadas pelas fraturas tamb?m se observa dissolu??o intraestratal e interestratal. Este sistema de canaliza??o forneceu os caminhos para o fluxo de ?gua, gerando avan?ada lixivia??o. A expans?o alargamento desses condutos em sub-superf?cie ocasiona no Est?gio 2 a queda de blocos, gera??o de dolinas e cavernas. Durante o Est?gio 3, a propaga??o da dissolu??o horizontal e vertical ao longo de fraturas e camadas causam coalesc?ncia de dolinas e captura de pequenos riachos que evoluem para vales incisos e canyons, como pode ser observado no Riacho do Livramento, afluente do rio Apodi-Mossor?, descrito na ?rea III deste estudo. Processos fluviais dominam a dissolu??o do carste durante o Est?gio 4, onde os sedimentos aluviais que recobrem a superf?cie c?rstica carbon?tica, resultando no preenchimento e posterior soterramento de cavernas e dolinas ao longo do vale. Observou-se assim que a influ?ncia do controle tect?nico e do acamamento sedimentar ocorre em todas as fases de evolu??o do carste, resultando nas diversas estruturas e formas de relevo coexistentes espacialmente e que se sucedem, temporalmente, durante os diversos est?gios descritos. Os dados aqui apresentados corroboram os resultados obtidos em outros estudos utilizando dados de GPR, po?os e levantamentos s?smicos, tanto na Bacia Potiguar como em outras bacias sedimentares que evidenciaram que tais estruturas podem ser preservadas ap?s o soterramento. / This research analyzes different types of karst landforms and their relationships with fracture systems, sedimentary bedding, and fluvial processes. We mapped karst features in Cretaceous carbonates of the Janda?ra Formation in the Potiguar Basin, Brazil. The study area is a semi-arid region, with low annual rainfall (600mm) and high evaporation (2000mm). We used high-resolution digital elevation models acquired by Light Detection and Ranging (LiDAR) and aerial ortophotographs acquired by unmanned aerial vehicle (UAV). This study focuses on surface and near surface process and grouped karst evolution into four stages. Fractures were opened by dissolution, which form vertical fluid pathways during stage 1 in a centimetric to metric scale. The most pervasive set of fracture concentrates the dissolution. Coeval intrastratal and interstratal dissolution occurred along horizontal layers, which bound dissolved fractures. This conduit system acted as pathways for water flow, which caused advanced leaching. The enlargement of conduits in subsurface contributed to the collapse of blocks, generation of sinkholes, and caves expansion in stage 2. During stage 3, propagation of horizontal and vertical dissolution along fractures and layers cause coalescence of sinkholes and capture of small streams. Fluvial processes dominate karst dissolution during stage 4, where alluvial sediments that caps the carbonate karst surface and fill caves and sinkholes along the valley. Tectonic and sedimentary bedding control all stages of karst evolution and resulting structures and landforms formed during these stages coexist. Comparisons with GPR, borehole and seismic surveys in sedimentary basins indicate that these structures are preserved after burial.