The geologic history of the Caribbean-Cocos Plate Boundary with special reference to the Nicoya Ophiolite Complex (Costa Rica) and D.S.D.P. results (Legs 67 and 84 off Guatemala): A synthesis
Bourgois, J.; Azema, J.; Baumgartner, P.O.; Tournon, J.; Desmet, A.; Aubouin, J. (1984). The geologic history of the Caribbean-Cocos Plate Boundary with special reference to the Nicoya Ophiolite Complex (Costa Rica) and D.S.D.P. results (Legs 67 and 84 off Guatemala): A synthesis. Tectonophysics 108(1-2): 1-32. https://dx.doi.org/10.1016/0040-1951(84)90152-5
In: Tectonophysics. ELSEVIER SCIENCE BV: New York; London; Amsterdam. ISSN 0040-1951; e-ISSN 1879-3266, more
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| Keywords |
Earth sciences > Geology
Earth sciences > Geophysics > Tectonophysics
Geological history
Plate boundaries
Rocks > Igneous rocks > Ultramafic rocks > Ophiolites
Caribbean Plate; Cocos Plate
Marine/Coastal |
| Authors | | Top |
- Bourgois, J.
- Azema, J.
- Baumgartner, P.O.
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- Tournon, J.
- Desmet, A.
- Aubouin, J.
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| Abstract |
The pre-upper Senoniah basement of Costa Rica crops out in the Santa Elena and Nicoya Peninsulas. From south to north and from base to top the basement includes: the Esperanza, Matapalo and Santa Elena units. The Esperanza unit is Albian-Santonian in age and consists mainly of pillow basalt and massive basal flows. The Matapalo unit includes Callovian to Cenomanian radiolarite and includes massive basalt flows, basalt, and dolerite basement. The Santa Elena unit contains ultramafic and mafic rocks in which harzburgite is the major component. The most important tectonic features of the Nicoya Complex are the large Santa Elena and Matapalo nappes. Nappe emplacement was from north to south during upper Santonian time. |
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