Structural Geology And Stress History Of The Platanares Geothermal Site, Honduras- Implications On The Tectonics Of The Northwestern Caribbean Plate Boundary

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Journal Article: Structural Geology And Stress History Of The Platanares Geothermal Site, Honduras- Implications On The Tectonics Of The Northwestern Caribbean Plate Boundary

Abstract
The structural geology of the Platanares geothermal site in western Honduras, located about 25 km south of the northern boundary of the Caribbean plate, is the result of post Early Miocene extensional deformation. Normal faults, many with listric geometries, are numerous throughout the area. Strike-slip faulting has mostly occurred on reactived normal faults. Analysis of the fault slip data shows an older minimum principal stress, σ3, oriented approximately N-S and a contemporary σ3 tensional and oriented ENE-WSW. The analysis suggests that σ3 has rotated clockwise since the Early Miocene although some of the change in orientation of σ3 might reflect counterclockwise rotation of the crust about a vertical axis. The σ1 and σ2 stress axes apparently switched recently, with the σ3 axis remaining unchanged. These results are consistent with a tectonic model in which the east-drifting Caribbean plate is pinned against North America by the subducting Cocos plate (Malfait and Dinkleman, 1972) and the northern and southern margins of the Caribbean plate are broad, mobile zones that are undergoing counterclockwise and clockwise rotations respectively (Gose, 1985). The majority of the hot springs at Platanares lie along Quebrada del Agua Caliente. Fractures control the movement of the geothermal waters. Hot springs occur along joints and faults and, in places, hot water flows laterally along bedding planes. If the fractures also control the movement of water at depth then the source reservoir of the geothermal waters may be located northeast of the principal hot spring areas along the quebrada since the majority of the faults dip in that direction. However, if the fault that seems to have controlled the development of Quebrada del Agua Caliente is vertical as inferred then the main reservoir may lie directly beneath this drainage.

Authors 
M. J. Aldrich Jr, Andrew I. Adams and Carlos Escobar








Published Journal 
Journal of Volcanology and Geothermal Research, 1991





DOI 
Not Provided
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Citation

M. J. Aldrich Jr,Andrew I. Adams,Carlos Escobar. 1991. Structural Geology And Stress History Of The Platanares Geothermal Site, Honduras- Implications On The Tectonics Of The Northwestern Caribbean Plate Boundary. Journal of Volcanology and Geothermal Research. (!) .