Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG
The study area, which encompasses the Environmental Protection Area (EPA) of the Lagoa Santa Karst, has an extension of 504 km2. In this region, metalimestones from the Sete Lagoas Formation occur, composed by Pedro Leopoldo and Lagoa Santa members, which accommodate the karst-fractured aquifers. Th...
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doaj-8f4fa4bc7df04eb4ab066734995cb3a82020-11-24T22:26:09ZengAssociação Brasileira de Águas SubterrâneasRevista Águas Subterrâneas0101-70042179-97842019-01-01331122110.14295/ras.v33i1.2914817523Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MGCarolina Gomes Ribeiro0Leila Nunes Menegasse Velásquez1Rodrigo Sérgio de Paula2Cecília Gouvêa MeirelesNilo Henrique Balzani LopesRolando Esteban Clavijo ArcosDiógenes Guilherme Pampolini Amaral3Instituto de Geociências da Universidade Federal de Minas Gerais (IGC-UFMG)Instituto de Geociências da Universidade Federal de Minas Gerais (IGC-UFMG)Instituto de Geociências da Universidade Federal de Minas Gerais (IGC-UFMG)Instituto de Geociências da Universidade Federal de Minas Gerais (IGC-UFMG)The study area, which encompasses the Environmental Protection Area (EPA) of the Lagoa Santa Karst, has an extension of 504 km2. In this region, metalimestones from the Sete Lagoas Formation occur, composed by Pedro Leopoldo and Lagoa Santa members, which accommodate the karst-fractured aquifers. The study method involved the collection of brittle and of karst dissolution structural measurements in a 9,000 m2 mesh, 1:300,000 scale, with the purpose of analyzing and associating them with cave directions and with groundwater flow directions toward east proven by dye tracer tests (E-W, NE and SE). Throughout the area, the systematic preponderance of caves and reliquary paleoconduits in N70-90W direction, with smooth plundge to east, indicates these paleoconduits result from dissolution along the intersection of high angle E-W fractures with smooth NNW bedding. High angle fractures, with NE and SE directions, are also frequent, although the exposure of their correlated paleoconduits and caves are rare. Nevertheless, even though N-S caves stand out as more persistent and elongated as well as E-W ones, groundwater flows were not observed in N-S direction. Results show that primordial structural parameters (high angle fractures and bedding planes) condition the underground flows in still active cave conduits toward east. However, there is a possibility of deep circulations in non-observable N-S segments occurring in the upper zones.https://aguassubterraneas.abas.org/asubterraneas/article/view/29148APA Carste de Lagoa Santa. Aquíferos cárstico-fissurais. Fraturas. Paleocondutos. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Carolina Gomes Ribeiro Leila Nunes Menegasse Velásquez Rodrigo Sérgio de Paula Cecília Gouvêa Meireles Nilo Henrique Balzani Lopes Rolando Esteban Clavijo Arcos Diógenes Guilherme Pampolini Amaral |
spellingShingle |
Carolina Gomes Ribeiro Leila Nunes Menegasse Velásquez Rodrigo Sérgio de Paula Cecília Gouvêa Meireles Nilo Henrique Balzani Lopes Rolando Esteban Clavijo Arcos Diógenes Guilherme Pampolini Amaral Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG Revista Águas Subterrâneas APA Carste de Lagoa Santa. Aquíferos cárstico-fissurais. Fraturas. Paleocondutos. |
author_facet |
Carolina Gomes Ribeiro Leila Nunes Menegasse Velásquez Rodrigo Sérgio de Paula Cecília Gouvêa Meireles Nilo Henrique Balzani Lopes Rolando Esteban Clavijo Arcos Diógenes Guilherme Pampolini Amaral |
author_sort |
Carolina Gomes Ribeiro |
title |
Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG |
title_short |
Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG |
title_full |
Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG |
title_fullStr |
Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG |
title_full_unstemmed |
Analysis of karst-fractured aquifers flows of the Lagoa Santa Karst EPA region, MG |
title_sort |
analysis of karst-fractured aquifers flows of the lagoa santa karst epa region, mg |
publisher |
Associação Brasileira de Águas Subterrâneas |
series |
Revista Águas Subterrâneas |
issn |
0101-7004 2179-9784 |
publishDate |
2019-01-01 |
description |
The study area, which encompasses the Environmental Protection Area (EPA) of the Lagoa Santa Karst, has an extension of 504 km2. In this region, metalimestones from the Sete Lagoas Formation occur, composed by Pedro Leopoldo and Lagoa Santa members, which accommodate the karst-fractured aquifers. The study method involved the collection of brittle and of karst dissolution structural measurements in a 9,000 m2 mesh, 1:300,000 scale, with the purpose of analyzing and associating them with cave directions and with groundwater flow directions toward east proven by dye tracer tests (E-W, NE and SE). Throughout the area, the systematic preponderance of caves and reliquary paleoconduits in N70-90W direction, with smooth plundge to east, indicates these paleoconduits result from dissolution along the intersection of high angle E-W fractures with smooth NNW bedding. High angle fractures, with NE and SE directions, are also frequent, although the exposure of their correlated paleoconduits and caves are rare. Nevertheless, even though N-S caves stand out as more persistent and elongated as well as E-W ones, groundwater flows were not observed in N-S direction. Results show that primordial structural parameters (high angle fractures and bedding planes) condition the underground flows in still active cave conduits toward east. However, there is a possibility of deep circulations in non-observable N-S segments occurring in the upper zones. |
topic |
APA Carste de Lagoa Santa. Aquíferos cárstico-fissurais. Fraturas. Paleocondutos. |
url |
https://aguassubterraneas.abas.org/asubterraneas/article/view/29148 |
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