Collision of the Caribbean Large Igneous Province with the Americas: earliest evidence from the forearc of Costa Rica

Détails

ID Serval
serval:BIB_124A936924AD
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Collision of the Caribbean Large Igneous Province with the Americas: earliest evidence from the forearc of Costa Rica
Périodique
GSA
Auteur⸱e⸱s
Andjic Goran, Baumgartner Peter O., Baumgartner Claudia
ISSN
1943-2674
Statut éditorial
Publié
Date de publication
20/03/2019
Peer-reviewed
Oui
Pages
1-26
Langue
anglais
Résumé
The Cretaceous period was marked by the most voluminous episodes of oceanic plateau volcanism in the Phanerozoic Eon. Primarily affecting the Pacific, mantle plumes generated oceanic plateaus during three main phases (ca. 145–140 Ma, ca. 122–115 Ma, and ca. 100–90 Ma). Central America is one of the very few circum-Pacific margins where remnants of these Cretaceous plateaus were accreted. The study of their onland exposures provides a highly valuable insight into the complexity and diversity of oceanic plateau histories, from their eruption to their accretion. Exposed in northern Costa Rica, the plateau remnants of the Nicoya Peninsula originated from a Jurassic oceanic crust over-thickened by Early and
Late Cretaceous hotspots. These shearedoff pieces of the Farallon Plate testify to the early tectonic interaction of the Caribbean Large Igneous Province (CLIP, ca. 94–89 Ma) with North America, initiated <5 m.y. after the onset of CLIP eruption. By combining our results with previously published data, we propose an updated tectono-stratigraphic
framework that divides the Nicoya Peninsula into two oceanic plateau terranes. (1) The accretion timing of the Aptian to Turonian Manzanillo Terrane is constrained by the Coniacian (ca. 89–86 Ma) base of the overlapping Loma Chumico Formation. The proximal tuffaceous forearc deposits of the Loma Chumico Formation are the oldest evidence of a volcanic arc in Costa Rica—called here the Berrugate Arc—as revealed by new biostratigraphic and geochemical data. (2) The Nicoya Complex s. str. is a composite plateau remnant containing rocks of Bajocian to earliest Campanian age. Its accretion occurred during the middle Campanian (ca. 79–76 Ma) and shut down the Berrugate Arc. In contrast to the collision of CLIP with North America, onset of the collision of CLIP with South America began much later, during the latest Campanian
(ca. 75–73 Ma).
Mots-clé
Caribbean, collision, forearc, Costa Rica
Création de la notice
19/12/2018 18:28
Dernière modification de la notice
21/08/2019 5:18
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