| Full text | |
| Author(s): |
Bologna, Mauricio S.
[1]
;
Nunes, Higo O.
[1]
;
Padilha, Antonio L.
[2]
;
Vitorello, Icaro
[2]
;
Padua, Marcelo B.
[2]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, IAG, Dept Geofis, BR-05508090 Sao Paulo - Brazil
[2] INPE, BR-12201970 Sao Jose Dos Campos - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of South American Earth Sciences; v. 42, p. 74-82, MAR 2013. |
| Web of Science Citations: | 10 |
| Abstract | |
The deep structure of the northern part of the Parana Basin has been investigated through the analysis of a SW-NE magnetotelluric (MT) profile composed of 24 broadband stations with periods from 0.001 to similar to 1000 s that are regularly spaced similar to 10 km apart. The SW portion of the profile crosses a negative Bouguer anomaly with amplitudes of similar to 20 mGal. Our analyses show that there are two lithospheric domains with different gravity and electric conductivity properties. In the regularized two-dimensional MT inversion model the mid-to-lower crust in the SW part of the profile is almost two orders in magnitude more conductive compared to the NE portion. This difference in conductivity extends to the uppermost mantle depths, suggesting the existence of a major lithospheric discontinuity in the north-central Parana Basin, locally coincident with the position of the Apore River. We interpret this discontinuity as a juxtaposition of terranes with distinct natures and ages, possibly as result of tectonic accretion during the formation of Western Gondwana. (C) 2012 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 09/50493-8 - Crustal and lithospheric mantle models under the Paraná and Chaco-Paraná basins by merging satellite gravity gradiometry, terrestrial gravimetry and geomagnetic and electromagnetic soundings |
| Grantee: | Icaro Vitorello |
| Support Opportunities: | Research Projects - Thematic Grants |