Late Cretaceous plume-induced subduction initiation along the southern margin of the Caribbean and NW South America: The first documented example with implications for the onset of plate tectonics

Whattam, Scott A.; Stern, Robert J.

doi:10.1016/j.gr.2014.07.011

Cited by 142 publications

(161 citation statements)

References 111 publications

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“…If the preferred model of Wu et al () is correct, spreading in the West Philippine Basin may be linked to the Manus hotspot, and subduction initiation may have occurred in response to interactions between the Manus hot spot plume and the large offset transform fault that formed the western margin of the Pacific Plate (e.g., MacPherson & Hall, ). A similar model has been proposed for the Caribbean plateau and the central America subduction zone (Gerya et al, ; Stern & Gerya, ; Whattam & Stern, ). If so, then the presence of a mantle plume could explain the higher than normal potential temperatures, and some of the extreme depletion of the mantle source could have resulted from decompression melting within the plume.…”

Section: Discussionsupporting

confidence: 59%

Magmatic Response to Subduction Initiation: Part 1. Fore‐arc Basalts of the Izu‐Bonin Arc From IODP Expedition 352

Shervais

Reagan

Haugen

et al. 2019

Geochem Geophys Geosyst

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The Izu‐Bonin‐Mariana (IBM) fore arc preserves igneous rock assemblages that formed during subduction initiation circa 52 Ma. International Ocean Discovery Program (IODP) Expedition 352 cored four sites in the fore arc near the Ogasawara Plateau in order to document the magmatic response to subduction initiation and the physical, petrologic, and chemical stratigraphy of a nascent subduction zone. Two of these sites (U1440 and U1441) are underlain by fore‐arc basalt (FAB). FABs have mid‐ocean ridge basalt (MORB)‐like compositions, however, FAB are consistently lower in the high‐field strength elements (TiO2, P2O5, Zr) and Ni compared to MORB, with Na2O at the low end of the MORB field and FeO* at the high end. Almost all FABs are light rare earth element depleted, with low total REE, and have low ratios of highly incompatible to less incompatible elements (Ti/V, Zr/Y, Ce/Yb, and Zr/Sm) relative to MORB. Chemostratigraphic trends in Hole U1440B are consistent with the uppermost lavas forming off axis, whereas the lower lavas formed beneath a spreading center axis. Axial magma of U1440B becomes more fractionated upsection; overlying off‐axis magmas return to more primitive compositions. Melt models require a two‐stage process, with early garnet field melts extracted prior to later spinel field melts, with up to 23% melting to form the most depleted compositions. Mantle equilibration temperatures are higher than normal MORB (1,400 °C–1,480 °C) at relatively low pressures (1–2 GPa), which may reflect an influence of the Manus plume during subduction initiation. Our data support previous models of FAB origin by decompression melting but imply a source more depleted than normal MORB source mantle.

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Section: Discussionsupporting

confidence: 59%

Magmatic Response to Subduction Initiation: Part 1. Fore‐arc Basalts of the Izu‐Bonin Arc From IODP Expedition 352

Shervais

Reagan

Haugen

et al. 2019

Geochem Geophys Geosyst

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137

115

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“…Magmatic ages of Nicoya complex rocks range from ~140-70 Ma (Hauff et al, 1997;Sinton et al, 1997;Hauff et al, 2000a;Hoernle et al, 2004) though the majority of these ages are post 100 Ma as noted by Whattam and Stern (2015), and dismembered radiolarite sequences of up to ~100 m thickness range from Callovian to Santonian (164-84 Ma) (e.g., Baumgartner, 1984;Schmidt-Effing, 1979 Whattam and Stern (2015) suggested the existence of two major pulses of oceanic plateau magmatism at 140-110 Ma, and a younger, volumetrically dominant one after 100 Ma. Thus, the older biostratigraphic and radiometric ages at Nicoya may be a record of an "old" plateau whereas the post-100 Ma ages are a record of a "younger" plateau.…”

Section: The Nicoya and Santa Elena Complexesmentioning

confidence: 99%

Origin of plagiogranites in oceanic complexes: A case study of the Nicoya and Santa Elena terranes, Costa Rica

Whattam

Gazel

et al. 2016

Lithos

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The origin of minor leucocratic intrusions known as "plagiogranites" in oceanic complexes dominated by basaltic compositions have been debated in the literature. Here we use well preserved plagiogranites within the contrasting Santa Elena Ophiolite and the Nicoya Complex, NW Costa Rica, to investigate the origin and age of these leucocratic intrusions. Magmatic zircons of plagiogranites of the Santa Elena ophiolite and the Nicoya Complex, yield weighted mean SHRIMP 206 Pb/ 238 U ages of 125.3±2.0 Ma and 90.9±2.0 Ma to 88.5±2.0 Ma (n = 5), respectively. These ages record the main magmatic phases of formation of these intrusions preserved in each complex. Relatively flat, unfractionated chondrite-normalized REE patterns of plagiogranites from both complexes mimic signatures of related mafic rocks, which is consistent with formation via fractional crystallization from a mafic source as opposed to partial melting of a mafic (basalt, amphibolite) protolith. In the case of the Nicoya Complex, modelling suggests that the Nicoya plagiogranites are consistent as ~10-15% residual liquids after fractional crystallization from its mafic parental source. Trace element systematics of the plagiogranites are consistent with an oceanic arc origin for Santa Elena and a mostly mid-ocean ridge to oceanicplateau origin for Nicoya.

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“…The seaward flanks of the Northern Andes are underlain by allochthonous oceanic terranes derived from the Caribbean large igneous province (CLIP) (Whattam & Stern, ) that were episodically accreted to the South American continent from the Late Campanian to the Paleocene (Hughes & Pilatasig, ; Jaillard et al, ; Luzieux et al, ; Mamberti et al, ; Reynaud et al, ; Vallejo et al, ), which led to the entrapment of the North Andean sliver (Alvarado et al, ; Kennan & Pindell, ). At the trailing edge of the North Andean sliver, the peculiarly oriented Gulf of Guayaquil‐Tumbes and Progreso basins are located along a major shear zone coincident with a complex suture zone between oceanic and continental crustal terranes, which probably marks the southern edge of the CLIP (Figure ) (Aizprua et al, ; Deniaud et al, ; Jaillard et al, ; Witt et al, ).…”

Section: Introductionmentioning

confidence: 99%

Cenozoic Stages of Forearc Evolution Following the Accretion of a Sliver From the Late Cretaceous‐Caribbean Large Igneous Province: SW Ecuador‐NW Peru

et al. 2019

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The SW Ecuador‐NW Peru forearc region is the southernmost location, where the Caribbean large igneous province (CLIP) interacted with the South American margin since the Late Cretaceous. The accretion of the CLIP to the margin led to the entrapment of the North Andean crustal Sliver, conforming the underlying basement of the forearc region in Ecuador, whereas in NW Peru, forearc depocenters involve rocks of continental affinity. Many existing tectonic reconstructions have treated these two areas independently, largely based on their crustal affinities. In contrast, this study integrates previous studies into an analysis of unpublished seismic profiles, potential field data, outcrop stratigraphy, and recent studies dealing with the dynamics of allochthonous terrane accretion along continental margins. Our integrated approach shows that SW Ecuador was dominated by a Late Cretaceous deforming outer wedge, which may have constituted a remnant of a northeast or northwest dipping obliquely obducted oceanic block at the edge of the CLIP. This tectonic phase was governed by plate instability, affecting NW Peru and SW Ecuador, followed by reestablishment of the margin by early Eocene. The resulting margin configuration and the spatial distribution of the different tectonic elements seem to have played a key role into the further Cenozoic development of the forearc region. The model presented in this study proposes that the accretion of buoyant oceanic terranes may have had a profound impact on the early margin configuration of SW Ecuador and NW Peru and led to the development of localized but genetically related forearc depocenters.

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Late Cretaceous plume-induced subduction initiation along the southern margin of the Caribbean and NW South America: The first documented example with implications for the onset of plate tectonics

Cited by 142 publications

References 111 publications

Magmatic Response to Subduction Initiation: Part 1. Fore‐arc Basalts of the Izu‐Bonin Arc From IODP Expedition 352

Magmatic Response to Subduction Initiation: Part 1. Fore‐arc Basalts of the Izu‐Bonin Arc From IODP Expedition 352

Origin of plagiogranites in oceanic complexes: A case study of the Nicoya and Santa Elena terranes, Costa Rica

Cenozoic Stages of Forearc Evolution Following the Accretion of a Sliver From the Late Cretaceous‐Caribbean Large Igneous Province: SW Ecuador‐NW Peru

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