Magmatic relationships and ages between adakites, magnesian andesites and Nb-enriched basalt-andesites from Hispaniola: Record of a major change in the Caribbean island arc magma sources

Earliest Neoproterozoic (ca. 1.0Ga) arc–back-arc basin nature along the northern Yunkai Domain of the Cathaysia Block: Geochronological and geochemical evidence from the metabasite

“…Thus Group 1 probably originated from a MORB-like source metasomatized by subduction-derived fluid via source contamination. Two alternative sources have been proposed to account for the geochemical characteristics of the Group 2 NEBA involving an OIBlike plume-related source (e.g., Storey et al, 1989;Leeman et al, 1990Leeman et al, , 2005Richards et al, 1990;Stern, 2002;Petrone et al, 2003;Castillo et al, 2002Castillo et al, , 2007Castillo, 2008;Petrone and Ferrari, 2008;Macpherson et al, 2010) and a mantle wedge metasomatized by young and hot slab-derived melt (e.g., Kepezhinaskas et al, 1996;Sajona et al, 1994Sajona et al, , 1996Wang et al, 2007aWang et al, , 2008bPetrone and Ferrari, 2008;Escuder Viruete et al, 2007;Gómez-Tuena et al, 2007;Wyman et al, 2000;Aguillón-Robles et al, 2001;Bourdon et al, 2002;Smithies et al, 2005). The Group 2 NEBA has negative Nb anomalies with (Nb/La)n ratios of 0.55-0.83, distinct from those of the OIB-like source.…”

Late Devonian–Early Permian A-type granites in the southern Altay Range, Northwest China: Petrogenesis and implications for tectonic setting of “A2-type” granites

“…Uplift of the hot asthenosphere will cause rifting of the overriding plate, which will then trigger formation of a series of fore-arc or back-arc basins (Bourgois et al, 1996;Sample and Reid, 2003). The thermal input of upwelling asthenosphere will cause partial melting of the slab edge, overlying mantle wedge and crustal rocks to produce adakites, Nb-enriched basalts, high-Mg rocks (boninites and picrites), tholeiites or chemically unusual ophiolites and A-type granites (Sisson et al, 2003;Martin et al, 2005;Mortimer et al, 2006;Escuder Viruete et al, 2007;Hung et al, 2007;Cole and Stewart, 2009;Tang et al, 2010b). In addition, the high temperature regime caused by asthenosphere upwelling may result in high-and/or low-grade metamorphism on the overriding plate (Brown, 1998;Iwamori, 2000).…”

High resolution magnetic, regional gravity and petrophysical characterization of the Dominican Republic tectonic domains with special focus on the Central Cordillera

“…Its southern limit is the HFZ (Lewis et al, 1999;Draper et al, 1996) and related volcano-plutonic oceanic units (Escuder Viruete et al, 2007).…”

“…The latter is mainly composed of metamorphic mafic and ultramafic volcanic rocks, and interpreted as an oceanic plateau constructed onto an oceanic crust (Palmer, 1979;Draper and Lewis, 1991;Lewis and Jiménez, 1991;Montgomery et al, 1994;Escuder Viruete et al, 2007, 2009). …”