Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9534779 | Gondwana Research | 2005 | 16 Pages |
Abstract
The studied granitoids and diabase from dykes and enclaves show negative eNd (512Ma) values (-14 to -10), high incompatible elements such as LILE, HFSE and REE, suggesting important contribution of Paleoproterozoic crust. The origin of the granites is thought to have involved partial melting of granodioritic or tonalitic lower crust. Such isotopic signature of the diabase from the dykes also reflects a Paleoproterozoic enriched lithospheric mantle in the area. The intrusion of the studied granitoids contemporary with sub-volcanic bimodal magmatism and deposition of many Cambrian "pull-apart" basins in the north and central tectonic Domain of the Borborema Province, suggest intrusion during post-tectonic relaxation of the Brasiliano orogeny following the assembly of West Gondwana.
Related Topics
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Earth and Planetary Sciences
Geology
Authors
Ignez P. Guimarães, Adejardo F. Da Silva Filho, Silvana C. Melo, Moacir B. Macambira,