Citation:

s00531-007-0289-5

Name: Geochemistry of oceanic crust of the Cocos Plate
Published: 2008
License: https://creativecommons.org/licenses/by/3.0/

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Published: 2008 (exact date unknown) • DOI registered: 2012-01-17

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Abstract:

New geochemical data from the Cocos Plate constrain the composition of the input into the Central American subduction zone and demonstrate the extent of influence of the Galápagos Hotspot on the Cocos Plate. Samples include sediments and basalts from Ocean Drilling Program (ODP) Site 1256 outboard of Nicaragua, gabbroic sills from ODP Sites 1039 and 1040, tholeiitic glasses from the Fisher Ridge off northwest Costa Rica, and basalts from the Galápagos Hotspot Track outboard of Central Costa Rica. Site 1256 basalts range from normal to enriched MORB in incompatible elements and have Pb and Nd isotopic compositions within the East Pacific Rise MORB field. The sediments have similar 206Pb/204Pb and only slightly more radiogenic 207Pb/204Pb and 208Pb/204Pb isotope ratios than the basalts. Altered samples from the subducting Galápagos Hotspot Track have similar Nd and Pb isotopic compositions to fresh Galápagos samples but have significantly higher Sr isotopic composition, indicating that the subduction input will have a distinct geochemical signature from Galápagos-type mantle material that may be present in the wedge beneath Costa Rica. Gabbroic sills from Sites 1039 and 1040 in East Pacific Rise (EPR) crust show evidence for influence of the Galápagos Hotspot ?100 km beyond the morphological hotspot track.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 6.504409 * Median Longitude: -87.050682 * South-bound Latitude: 0.736050 * West-bound Longitude: -91.934350 * North-bound Latitude: 9.661600 * East-bound Longitude: -83.509383

Date/Time Start: 1996-03-14T00:00:00 * Date/Time End: 2002-11-23T03:45:00

Event(s):

170-1039C * Latitude: 9.639700 * Longitude: -86.200000 * Date/Time Start: 1996-11-08T14:00:00 * Date/Time End: 1996-11-11T01:15:00 * Elevation: -4351.4 m * Penetration: 448.7 m * Recovery: 37.65 m * Location: Costa Rica subduction complex, North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 85.6 m cored; 0 m drilled; 44 % recovery

170-1040C * Latitude: 9.661600 * Longitude: -86.178900 * Date/Time Start: 1996-11-11T05:30:00 * Date/Time End: 1996-11-18T12:00:00 * Elevation: -4177.9 m * Penetration: 665 m * Recovery: 377.28 m * Location: Costa Rica subduction complex, North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 505.7 m cored; 0 m drilled; 74.6 % recovery

206-1256B * Latitude: 6.736500 * Longitude: -91.934330 * Date/Time Start: 2002-11-15T06:45:00 * Date/Time End: 2002-11-17T06:30:00 * Elevation: -3634.7 m * Penetration: 251.7 m * Recovery: 224.14 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 29 cores; 251.7 m cored; 0 m drilled; 89.1 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

3 datasets

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Datasets listed in this publication series

Sadofski, S; Hoernle, K; Duggen, S et al. (2009): (Table 3) Sr-Nd-Pb isotope ratios of selected Cocos Plate samples. https://doi.org/10.1594/PANGAEA.773151
Sadofski, S; Hoernle, K; Duggen, S et al. (2009): (Table 2) Trace element concentrations of selected Cocos Plate samples. https://doi.org/10.1594/PANGAEA.773150
Sadofski, S; Hoernle, K; Duggen, S et al. (2009): (Table 1) Major and volatile element compositions of Fisher Ridge glass samples. https://doi.org/10.1594/PANGAEA.773149