Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones
Subtropical laterites in Misiones province cover the Jurassic-Cretaceous Serra Geral basalts. Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory states that these deposits result from chemical weathering of the underlying tholeiitic basalts. However,...
| Autores principales: | , , , , |
|---|---|
| Formato: | Objeto de conferencia |
| Lenguaje: | Inglés |
| Publicado: |
2019
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/77403 |
| Aporte de: |
| id |
I19-R120-10915-77403 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Geología tropical/subtropical weathering weathering indices Serra Geral Fm. lateritic sources |
| spellingShingle |
Geología tropical/subtropical weathering weathering indices Serra Geral Fm. lateritic sources Campodonico, Verena Agustina Pasquini, Andrea Inés Lecomte, Karina Leticia García, María Graciela Depetris, Pedro José Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones |
| topic_facet |
Geología tropical/subtropical weathering weathering indices Serra Geral Fm. lateritic sources |
| description |
Subtropical laterites in Misiones province cover the Jurassic-Cretaceous Serra Geral basalts. Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory states that these deposits result from chemical weathering of the underlying tholeiitic basalts. However, during the last decade, an allochthonous “tropical loess” model was proposed. A lateritic profile (~2 m thick, 26°9'58"S - 54°35'3"W) was analyzed in order to constrain the nature of weathering processes and the provenance of the lateritic layer. Different alteration indices showed the extreme leaching of the basaltic bedrock. The index of lateritization (IOL = 35-50) and the accompanying SAF ternary plot (SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>-Fe<SUB>2</SUB>O<SUB>3</SUB>), indicate an increasing weathering trend towards the profiles' top, reflecting the modest loss of SiO<SUB>2</SUB> (relative to Al<SUB>2</SUB>O<SUB>3</SUB> and Fe<SUB>2</SUB>O<SUB>3</SUB>) during kaolinitization. The geochemical approach used in this work clearly relates the analyzed laterites to the underlying tholeiitic basalts, supporting the autochthonous origin theory. |
| format |
Objeto de conferencia Objeto de conferencia |
| author |
Campodonico, Verena Agustina Pasquini, Andrea Inés Lecomte, Karina Leticia García, María Graciela Depetris, Pedro José |
| author_facet |
Campodonico, Verena Agustina Pasquini, Andrea Inés Lecomte, Karina Leticia García, María Graciela Depetris, Pedro José |
| author_sort |
Campodonico, Verena Agustina |
| title |
Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones |
| title_short |
Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones |
| title_full |
Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones |
| title_fullStr |
Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones |
| title_full_unstemmed |
Análisis de la meteorización química y proveniencia en lateritas subtropicales de Misiones |
| title_sort |
análisis de la meteorización química y proveniencia en lateritas subtropicales de misiones |
| publishDate |
2019 |
| url |
http://sedici.unlp.edu.ar/handle/10915/77403 |
| work_keys_str_mv |
AT campodonicoverenaagustina analisisdelameteorizacionquimicayprovenienciaenlateritassubtropicalesdemisiones AT pasquiniandreaines analisisdelameteorizacionquimicayprovenienciaenlateritassubtropicalesdemisiones AT lecomtekarinaleticia analisisdelameteorizacionquimicayprovenienciaenlateritassubtropicalesdemisiones AT garciamariagraciela analisisdelameteorizacionquimicayprovenienciaenlateritassubtropicalesdemisiones AT depetrispedrojose analisisdelameteorizacionquimicayprovenienciaenlateritassubtropicalesdemisiones AT campodonicoverenaagustina probingintothenatureofchemicalweatheringandprovenanceinmisionessubtropicallaterites AT pasquiniandreaines probingintothenatureofchemicalweatheringandprovenanceinmisionessubtropicallaterites AT lecomtekarinaleticia probingintothenatureofchemicalweatheringandprovenanceinmisionessubtropicallaterites AT garciamariagraciela probingintothenatureofchemicalweatheringandprovenanceinmisionessubtropicallaterites AT depetrispedrojose probingintothenatureofchemicalweatheringandprovenanceinmisionessubtropicallaterites |
| bdutipo_str |
Repositorios |
| _version_ |
1764820484300472321 |