The Curaçao Lava Formation: Samples of the Oldest and Most Primitive Magmas from the Galapagos Plume

Hergt, Janet M

doi:10.1180/minmag.1994.58a.1.216

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Basalts with similar geochemistry and age (&90 Ma) are reported from various parts of the Caribbean Plate, including Haiti, the Caribbean basement, Colombia, Ecuador and Curaiao (Donelly et al, 1973;Echeverrı´a, 1980;Aitken and Echeverrı´a, 1984;Dupre´and Echeverrı´a, 1984;Sen et al, 1988;Sinton et al 1993;Hergt et al, 1994;Kerr et al, 1996a, b). Nd and Pb isotopic ratios from Gorgona, Haiti and Curaiao show a similar narrow compositional range.…”

Section: Relationship Of Costa Rican Terranes To the Caribbean Large mentioning

confidence: 69%

A Mid Cretaceous origin for the Galápagos hotspot: volcanological, petrological and geochemical evidence from Costa Rican oceanic crustal segments

Hauff¹,

Hoernle²,

Schmincke³

et al. 1997

Geol Rundsch

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The Quepos, Nicoya and Herradura oceanic igneous terranes in Costa Rica are conspicuous features of a Mid to Late Cretaceous regional magmatic event that encompasses similar terranes in Central America, Colombia, Ecuador and the Caribbean. The Quepos terrane (66 Ma), which consists of ol-cpx phyric, tholeiitic pillow lavas overlain by highly vesicular hyaloclastites, breccias and conglomerates, is interpreted as an uplifted seamount/ocean island complex. The Nicoya ( &90 Ma) and Herradura terranes consist of fault-bounded sequences of sediments, tholeiitic volcanics (pillow lavas and massive sheet flows) and plutonic rocks. The volcanic rocks were emplaced at relatively high eruption rates in moderate to deep water, possibly forming part of an oceanic plateau. Major and trace element data from Nicoya/Herradura tholeiites indicate higher melting temperatures than inferred for normal mid-ocean-ridge basalts (MORB) and/or a different source composition. Sr-Nd-Pb isotopic ratios from all three terranes are distinct from MORB but resemble those from the Gala´pagos hotspot. The volcanological, petrological and geochemical data from Costa Rican volcanic terranes, combined with published age data, paleomagnetic results and plate tectonic reconstructions of this region, provide strong evidence for a Mid Cretaceous ( &90Ma) age for the Gala´pagos hotspot, making it one of the oldest known, active hotspots on Earth. Our results also support an origin of the Caribbean Plate through melting of the head of the Gala´pagos starting plume.

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Section: Relationship Of Costa Rican Terranes To the Caribbean Large mentioning

confidence: 69%

A Mid Cretaceous origin for the Galápagos hotspot: volcanological, petrological and geochemical evidence from Costa Rican oceanic crustal segments

Hauff¹,

Hoernle²,

Schmincke³

et al. 1997

Geol Rundsch

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High-Ti and low-Ti mafic potassic magmas: Key to plume-lithosphere interactions and continental flood-basalt genesis

Gibson

Thompson

Dickin

et al. 1995

Earth and Planetary Science Letters

185

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Erratum to “High-Ti and low-Ti mafic potassic magmas: Key to plume—lithosphere interactions and continental flood-basalt genesis” [Earth Planet. Sci. Lett. 136 (1995) 149–165]

Gibson¹,

Thompson²,

Dickin³

et al. 1996

Earth and Planetary Science Letters

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The Curaçao Lava Formation: Samples of the Oldest and Most Primitive Magmas from the Galapagos Plume

Cited by 5 publications

References 7 publications

A Mid Cretaceous origin for the Galápagos hotspot: volcanological, petrological and geochemical evidence from Costa Rican oceanic crustal segments

A Mid Cretaceous origin for the Galápagos hotspot: volcanological, petrological and geochemical evidence from Costa Rican oceanic crustal segments

High-Ti and low-Ti mafic potassic magmas: Key to plume-lithosphere interactions and continental flood-basalt genesis

Erratum to “High-Ti and low-Ti mafic potassic magmas: Key to plume—lithosphere interactions and continental flood-basalt genesis” [Earth Planet. Sci. Lett. 136 (1995) 149–165]

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