Geochemical components in a Cretaceous island arc: The Th/La–(Ce/Ce*)Nd diagram and implications for subduction initiation in the inter-American region

Hastie, Alan R.; Mıtchell, Sımon F.; Treloar, Peter J.; Kerr, Andrew C.; Neill, Iain; Barfod, Dan N.

doi:10.1016/j.lithos.2012.12.001

Cited by 56 publications

(25 citation statements)

References 72 publications

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“…4a; Hastie et al, 2013). Most studies agree that these rocks form by low-degree melting of enriched asthenospheric mantle (e.g., Macpherson et al, 2010).…”

Section: Elemental Evidencementioning

confidence: 95%

Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Kheirkhah

Neill

2015

Journal of Asian Earth Sciences

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a b s t r a c tHundreds of compositionally diverse volcanoes have erupted on the Turkish-Iranian Plateau in the last 15 Myr, attributed to one or more of the processes of Middle Miocene Tethyan slab break-off, localised lithospheric delamination and small-scale convection. Magmatism post-dates the initial Late Eocene or Early Oligocene Arabia-Eurasia collision by >10 Myr. By contrast, in the east of the plateau in Eastern Iran there has been intermittent magmatism from the Late Oligocene to the Quaternary. Magma types include alkali basalt flows and scoria cones and adakite-like intermediate-felsic lavas and domes. New elemental and Nd-Sr-Pb-Hf isotope data from Quaternary mafic alkaline flows near Quchan in the Meshkan area in the NE of the country are combined with existing data from Miocene-Quaternary volcanic centres in the Binalud Range and the Nayband/Neh Fault zones. These mafic, incompatible element-enriched rocks, with positive Nb-Ta anomalies, are OIB-like and are argued to have formed by low-degree melting of a heterogeneous mantle source which contained DMM-and EMII-like components. At least some of the melting took place in the garnet stability field. Significant crustal contamination during magma ascent is recognised in the Nayband/Neh samples. Penecontemporaneous adakite-like rocks are argued to be high-pressure fractionates of basaltic melts which may have a separate source to the OIB-like basalts. Late Cenozoic mantle melting was aided by (1) localised extension and (2) enhanced small-scale asthenospheric convection related to Makran subduction, low mantle viscosity owing to the prior Tethyan subduction history of the region, and possibly edge-driven convection on the margin of the thickened Zagros lithosphere.

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“…4a; Hastie et al, 2013). Most studies agree that these rocks form by low-degree melting of enriched asthenospheric mantle (e.g., Macpherson et al, 2010).…”

Section: Elemental Evidencementioning

confidence: 95%

Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Kheirkhah

Neill

2015

Journal of Asian Earth Sciences

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“…Here, we particularly focus on ages of magmatism (e.g., oceanic island arc rocks), to infer the presence of a convergent plate boundary for that period. The geochemical literature of the Caribbean contains a large number of models invoking major geodynamic events such as subduction polarity reversals or slab break-off episodes, and complex subduction zone configurations (e.g., Meschede and Frisch, 1998;Kerr et al, 1999;Neill et al, 2011;Hastie et al, 2013). Such interpretations are not a priori followed here, but rather, our reconstruction may serve as an independent kinematic basis to evaluate the kinematic feasibility of such scenarios.…”

Section: Approachmentioning

confidence: 99%

Kinematic reconstruction of the Caribbean region since the Early Jurassic

Boschman

Hinsbergen

Torsvik

et al. 2014

Earth-Science Reviews

258

300

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“…Haiti is part of the Cretaceous volcanic island arc constituted at the boundary of the Pacific realm (Pindell et al, 2006) called the Greater Antilles arc. The Greater Antilles volcanic arc was initiated by an eastward dipping subduction in Central America (Pindell et al, 2012;Van der Lelij, 2013;Hastie et al, 2013). The Greater Antilles arc now consists of a part of Cuba, Hispaniola and Puerto Rico islands (Mann et al, 1995).…”

Section: Geological and Tectonic Setting Of Haitimentioning

confidence: 99%

Crustal structure of western Hispaniola (Haiti) from a teleseismic receiver function study

et al. 2017

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Haiti, located at the northern Caribbean plate boundary, records a geological history of terrane accretion from Cretaceous island arc formations to the Eocene to Recent oblique collision with the Bahamas platform. Little is presently known about the underlying crustal structure of the island. We analyze P-waveforms arriving at 27 temporary broadband seismic stations deployed over a distance of 200 km across the major terrane boundaries in Haiti to determine the crustal structure of western Hispaniola. We compute teleseismic receiver functions using the Extended-Time Multi-Taper method and determine crustal thickness and bulk composition (V p /V s ) using the H-к stacking method. Three distinctive and fault-bounded crustal domains, defined by their characteristic Moho depth distributions and bulk crustal V p /V s , are imaged across Haiti. We relate these domains to three crustal terranes that have been accreted along the plate boundary during the northeastwards displacement of the Caribbean plate and are presently being deformed in a localized fold and thrust belt. In the northern domain, made up of volcanic arc facies, the crust has a thickness of~23 km and Vp/Vs of 1.75 ± 0.1 typical of average continental crust. The crust in the southern domain is part of the Caribbean Large Igneous Province (Caribbean LIP), and is~22 km thick with Vp/Vs of 1.80 ± 0.03 consistent with plume-related rocks of late Cretaceous age. Significantly thicker, the crust in central Haiti has values of Moho depths averaging~41 km and with Vp/Vs of 1.80 ± 0.05. We propose that the central domain is likely constructed of an island arc upper crust with fragments of dense material originating from mafic lavas or LIP material. We produce a crustal profile along a N-S transect across Haiti accounting for the surface geology, shallow structural history, and new seismological constraints provided by variations of crustal thickness and bulk composition.

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Geochemical components in a Cretaceous island arc: The Th/La–(Ce/Ce*)Nd diagram and implications for subduction initiation in the inter-American region

Cited by 56 publications

References 72 publications

Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Petrogenesis of OIB-like basaltic volcanic rocks in a continental collision zone: Late Cenozoic magmatism of Eastern Iran

Kinematic reconstruction of the Caribbean region since the Early Jurassic

Crustal structure of western Hispaniola (Haiti) from a teleseismic receiver function study

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