Neodymium and Strontium isotopes as source indicators for terrigenous sediments deposited in NE Brazil

Itxaso Ruiz; Leopoldo Pena

doi:10.21701/bolgeomin.129.4.003

Autores/as

Itxaso Ruiz Basque Centre for Climate Change (BC3), Scientific Campus of the University of the Basque Count
Leopoldo Pena Department of Earth and Ocean Dynamics, University of Barcelona

DOI:

https://doi.org/10.21701/bolgeomin.129.4.003

Palabras clave:

Cuenca sedimentaria, Estroncio (Sr), fuente, Neodimio (Nd), paleoclima

Resumen

Este estudio investiga el origen sedimentario de los materiales depositados por el río Amazonas durante los últimos 30 kyr BP y reconstruye el patrón de precipitación del área fuente. Para ello, se han utilizado quince muestras de un registro sedimentario marino ubicado en el margen de la Guayana Francesa y se han analizado los isótopos de Neodimio (Nd) y de Estroncio (Sr). Los resultados (Sr: 0.71385±0.00166; ε_Nd: -11.67±0.55) sugieren que la zona del Amazonas occidental es la fuente principal del material terrígeno, y apuntan a la cuenca del río Solimões como el origen más probable. Así mismo, el análisis paleoclimático de la zona refuerza esta conclusión, exhibiendo condiciones continentales húmedas para los Heinrich Stadials 1 y 2 en comparación con el Último Máximo Glacial, así como para el Último Máximo Glacial en comparación con el Holoceno temprano.

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