Geochemistry of oceanic crust of the Cocos Plate
Fuente:
PANGAEA
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
2008
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1867171362129313792 |
|---|---|
| author | Sadofski, Seth Hoernle, Kaj Duggen, Svend Hauff, Folkmar Werner, Reinhard Garbe-Schönberg, Dieter |
| author_facet | Sadofski, Seth Hoernle, Kaj Duggen, Svend Hauff, Folkmar Werner, Reinhard Garbe-Schönberg, Dieter |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_773152 |
| institution | PANGAEA |
| language | en |
| publishDate | 2008 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Geochemistry of oceanic crust of the Cocos Plate Sadofski, Seth Hoernle, Kaj Duggen, Svend Hauff, Folkmar Werner, Reinhard Garbe-Schönberg, Dieter 13DK; 170-1039C; 170-1040C; 1DK; 206-1256B; 206-1256C; 206-1256D; 28DK; 6DK; 9DK; Costa Rica subduction complex, North Pacific Ocean; Dredge; Dredge, box; DRG; DRG_B; DRILL; Drilling/drill rig; East Pacific; Fisher-Ridge; Joides Resolution; Leg170; Leg206; North Pacific Ocean; Ocean Drilling Program; ODP; Pacific Ocean; PACOMAR III; PAGANINI 3; PAKOMAR II - HESS DEEP; SO107; SO107_13DK; SO107_1DK; SO107_28DK; SO107_6DK; SO107_9DK; SO144/3_60DR; SO144/3b; SO81/1; Sonne 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. |
| title | Geochemistry of oceanic crust of the Cocos Plate |
| topic | 13DK; 170-1039C; 170-1040C; 1DK; 206-1256B; 206-1256C; 206-1256D; 28DK; 6DK; 9DK; Costa Rica subduction complex, North Pacific Ocean; Dredge; Dredge, box; DRG; DRG_B; DRILL; Drilling/drill rig; East Pacific; Fisher-Ridge; Joides Resolution; Leg170; Leg206; North Pacific Ocean; Ocean Drilling Program; ODP; Pacific Ocean; PACOMAR III; PAGANINI 3; PAKOMAR II - HESS DEEP; SO107; SO107_13DK; SO107_1DK; SO107_28DK; SO107_6DK; SO107_9DK; SO144/3_60DR; SO144/3b; SO81/1; Sonne |
| url | https://doi.org/10.1594/PANGAEA.773152 |