Kinematics of the western Caribbean: Collision of the Cocos Ridge and upper plate deformation

Kobayashi, Daisuke; LaFemina, Peter; Geirsson, H.; Chichaco, Eric; Abrego, Antonio A.; Mora, Héctor Plascencia; Camacho, Eduardo

doi:10.1002/2014gc005234

Cited by 71 publications

(109 citation statements)

References 72 publications

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“…The principal stress directions may also be affected by other factors. The subducting Cocos Ridge has been proposed to act as an indenter, as shown by a margin‐parallel component of fore‐arc deformation measured on Costa Rica GPS land stations [ LaFemina et al ., ; Kobayashi et al ., ]. With the exception of the deepest interval in Site U1379, the S Hmax directions we observe are approximately parallel and perpendicular to the isobaths of the Cocos Ridge flank and to the most westerly azimuths of the GPS velocities in the land area NW of the Osa peninsula (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…The subduction of the Cocos Ridge produces basal erosion seaward of the Osa peninsula [ Vannucchi et al ., ]. The Cocos Ridge also acts as an indenter, as shown by the fanning pattern of deformation away from the Cocos Ridge axis measured by GPS [ LaFemina et al ., ; Kobayashi et al ., ]. The Osa peninsula lies on top of the subducted Cocos Ridge axis and its geology suggests that the bulk of the overriding plate there is a Cenozoic mélange resulting from the accretion of oceanic seamounts [ Vannucchi et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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Horizontal principal stress orientation in the Costa Rica Seismogenesis Project (CRISP) transect from borehole breakouts

Malinverno

Saito

Vannucchi

2016

Geochem Geophys Geosyst

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The Costa Rica Seismogenesis Project (CRISP) drilled the Pacific margin of the Middle America Trench just north of where the Cocos Ridge enters the subduction zone, resulting in basal erosion of the upper plate. Here we report the orientations of the maximum horizontal principal stress (SHmax) from borehole breakouts detected by logging‐while‐drilling and wireline downhole measurements. All SHmax directions were estimated in the sediment cover of the margin, above the deeper rocks of the deformed margin wedge. We observe three overall SHmax orientations: NNE‐SSW (25° azimuth) in the deepest interval drilled at the upper slope Site U1379; ENE‐WSW (82°) in the rest of Site U1379 and in Site U1413, also drilled in the upper slope; and NNW‐SSE (157°) in the mid‐slope Site U1378. Our preferred interpretation is that the deepest interval of Site U1379 records the stress conditions in the underlying margin wedge, as SHmax is parallel to the direction of the Cocos‐Caribbean plate convergence and of the compressional axes of plate boundary fault earthquakes. The variable SHmax directions observed elsewhere are likely due to the effect of a network of normal faults that subdivide the sediment cover into a number of independently deforming blocks. In addition, the observed SHmax directions may be influenced by the subducting Cocos Ridge, which acts as an indenter causing oblique deformation, and by the transition to seismogenic subduction along the plate boundary fault.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Horizontal principal stress orientation in the Costa Rica Seismogenesis Project (CRISP) transect from borehole breakouts

Malinverno

Saito

Vannucchi

2016

Geochem Geophys Geosyst

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“…LaFemina et al (2009 suggested that the collision of the Cocos Ridge contributes to the northwestward motion of the forearc sliver. The buoyant, thickened crust of the Cocos Ridge acts as an indenter (Gardner et al, 2013) and arc-parallel forearc motion, as well as relative (north)eastward motion of the Panama-Chocó block represents tectonic escape (Kobayashi et al, 2014). Phipps Morgan et al (2008) noticed that the Motagua fault zone at present does not crosscut the Central American forearc and does not continue towards the Central American trench.…”

Section: Central Americamentioning

confidence: 99%

Kinematic reconstruction of the Caribbean region since the Early Jurassic

Boschman

Hinsbergen

Torsvik

et al. 2014

Earth-Science Reviews

256

300

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“…In southern Costa Rica, the Cocos plate subducts northeastward beneath the Caribbean plate (locally the Panama Microplate) at the Middle American Trench at a rate of ∼80–90 mm/year (Figure ; Argus et al, ; DeMets, ; Kobayashi et al, ). The southeasternmost portion of the Cocos plate was created by the Cocos‐Nazca spreading center (Figure ) and contains many roughness elements and bathymetric features related to overprinting by the Galápagos Hot Spot (Figure ; Barckhausen et al, ; Hoernle et al, ; Lonsdale & Klitgord, ).…”

Section: Tectonic Framework and Subducting Bathymetrymentioning

confidence: 99%

Plio‐Quaternary Outer Forearc Deformation and Mass Balance of the Southern Costa Rica Convergent Margin

2019

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Identifying the processes that control the rates, magnitudes, and longevity of outer forearc deformation is fundamental to our understanding of how mass is distributed within subduction zone systems. The margin of southern Costa Rica has been the target of numerous onland field studies, geophysical surveys, and the Costa Rica Seismogenesis Project (CRISP) drilling expedition. Despite these extensive data sets, the relative roles that subduction erosion, shortening, and seamount subduction play in shaping the behavior and evolution of the outer forearc remain debated. Here we analyze new and existing geomorphic, geologic, stratigraphic, and geochronologic data sets across the entire forearc‐arc‐backarc system near the Costa Rica Seismogenesis Project transect to test several conceptual models for outer forearc deformation in southern Costa Rica. The results from the compilation agree with a model where recent arcward retreat of the trench (movement of the trench in the direction of the arc) occurs due to underthrusting of the outer forearc beneath the inner forearc, and outer forearc deformation occurs primarily by transient rapid vertical tectonism due to the subduction of bathymetric relief. These results lead to a new conceptual model for Plio‐Quaternary outer forearc deformation in southern Costa Rica that does not require large amounts of net mass loss within the upper plate.

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Kinematics of the western Caribbean: Collision of the Cocos Ridge and upper plate deformation

Cited by 71 publications

References 72 publications

Horizontal principal stress orientation in the Costa Rica Seismogenesis Project (CRISP) transect from borehole breakouts

Horizontal principal stress orientation in the Costa Rica Seismogenesis Project (CRISP) transect from borehole breakouts

Kinematic reconstruction of the Caribbean region since the Early Jurassic

Plio‐Quaternary Outer Forearc Deformation and Mass Balance of the Southern Costa Rica Convergent Margin

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