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Kinematics associated with late Cenozoic deformation in central Costa Rica; western boundary of the Panama Microplate

Donald M. Fisher, Thomas W. Gardner, Jeffrey S. Marshall and Walter Montero P.
Kinematics associated with late Cenozoic deformation in central Costa Rica; western boundary of the Panama Microplate
Geology (Boulder) (March 1994) 22 (3): 263-266

Abstract

We present kinematic data for late Cenozoic deformation in central Costa Rica that marks the western margin of the Panama microplate (i.e., the Caribbean-Panama boundary). This boundary extends from the North Panama deformed belt, west through the Valle Central in Costa Rica, and then southwest along the East Nicoya Fracture Zone to intersect the Middle America Trench. Terrace correlation and basin asymmetry indicate a major change in tectonic evolution across the boundary, where three regional northeast-striking faults intersect the Pacific coast. Mesoscopic fault populations are consistent with transtension across these northeast striking faults and with transpression within the east-trending Valle Central. This late Tertiary and Quaternary transcurrent deformation links the North Panama deformed belt to the east with the Middle America Trench to the west. Earthquake focal mechanisms are consistent with mesoscopic fault data, suggesting that fault populations characterize the present-day stress field. This deformation marks the western extent of the Panama microplate, a fragment of volcanic arc that separated from the Caribbean Plate in the late Tertiary or early Quaternary and is currently advancing northward due to collisions with South America to the east and the indenting Cocos Ridge on the Cocos Plate to the south.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 22
Serial Issue: 3
Title: Kinematics associated with late Cenozoic deformation in central Costa Rica; western boundary of the Panama Microplate
Affiliation: Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Pages: 263-266
Published: 199403
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 32
Accession Number: 1994-025495
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N07°00'00" - N23°00'00", W90°00'00" - W58°00'00"
N00°00'00" - N09°00'00", W92°30'00" - W83°00'00"
N08°00'00" - N11°15'00", W86°00'00" - W82°30'00"
Secondary Affiliation: Universidad de Costa Rica, San Jose, CRI, Costa Rica
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199412
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