 |
| Titel |
The upper-mantle transition zone beneath the Chile-Argentina flat subduction zone |
| VerfasserIn |
Paula Bagdo, Luciana Bonatto, Gabriela Badi, Claudia Piromallo |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126681
|
| Publikation (Nr.) |
 EGU/EGU2016-6437.pdf |
|
|
|
|
|
| Zusammenfassung |
| The main objective of the present work is the study of the upper mantle structure of the
western margin of South America (between 26∘S and 36∘S) within an area known as the
Chile-Argentina flat subduction zone. For this purpose, we use teleseismic records
from temporary broad band seismic stations that resulted from different seismic
experiments carried out in South America. This area is characterized by on-going orogenic
processes and complex subduction history that have profoundly affected the underlying
mantle structure. The detection and characterization of the upper mantle seismic
discontinuities are useful to understand subduction processes and the dynamics of mantle
convection; this is due to the fact that they mark changes in mantle composition
or phase changes in mantle minerals that respond differently to the disturbances
caused by mantle convection. The discontinuities at a depth of 410 km and 660 km,
generally associated to phase changes in olivine, vary in width and depth as a result of
compositional and temperature anomalies. As a consequence, these discontinuities are an
essential tool to study the thermal and compositional structure of the mantle. Here, we
analyze the upper-mantle transition zone discontinuities at a depth of 410 km and 660
km as seen from Pds seismic phases beneath the Argentina-Chile flat subduction. |
|
|
|
|
|
|