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\begin{document}

\title{Reconstructing the crustal section of the intra-oceanic Caribbean island
arc: contraints from the cumulate layered gabbronorites and pyroxenites
of the Rio Boba plutonic sequence, northern Dominican Republic}



\author[1,1]{Javier Escuder-Viruete}%
\author[2,2]{Mercedes Castillo-Carrión}%
\author[3,3]{Fernando Pérez Valera}%
\author[4,4]{Pablo Valverde-Vaquero}%
\author[5,5]{Álvaro Rubio Ordónez}%
\author[5,5]{Francisco José Fernández}%
\affil[1]{Instituto Geologico Minero España - CSIC}%
\affil[2]{Instituto Geológico y Minero de España}%
\affil[3]{Departamento de Ciencias de la Tierra y del Medio Ambiente}%
\affil[4]{Instituto Geológico y Minero de España - CSIC}%
\affil[5]{Departamento de Geología}%


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  \date{May 15, 2024}


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\begin{abstract}
Located in northern Dominican Republic, the Early Cretaceous Rio Boba
mafic-ultramafic plutonic sequence constitutes a lower crust section of
the Caribbean island arc, made up by gabbroic rocks and subordinate
pyroxenite. Modal compositions, mineral chemistry, whole-rock
compositions and thermobarometric calculations indicate that pyroxenites
and gabbronorites represent a cumulate sequence formed by fractionation
of tholeiitic magmas with initially very low H\textsubscript{2}O content
in the lower crust of the arc (0.6-0.8 GPa). Melts evolved along a
simplified crystallization sequence of olivine \selectlanguage{ngerman}® pyroxenes ® plagioclase
® Fe-Ti oxides. The magmatic evolution of the Rio Boba sequence and
associated supra-crustal Puerca Gorda metavolcanic rocks is multi-stage
and involves the generation of magmas from melting of different sources
in a supra-subduction zone setting. The first stage included the
formation of a highly depleted substrate as result of decompressional
melting of a refractory mantle source, represented by a cumulate
sequence of LREE-depleted IAT and boninitic gabbronorites and
pyroxenites. The second stage involved volumetrically subordinate
cumulate troctolites and gabbros, which are not penetratively deformed.
The mantle source was refractory and enriched by a LILE-rich hydrous
fluid derived from a subducting slab and/or overlying sediments, and
possibly by a LREE-rich melt. The third stage is recorded in the upper
crust of the arc by the Puerca Gorda `normal' IAT protoliths, which are
derived from an N-MORB mantle source enriched with a strong subduction
component. This magmatic evolution has implications for unravelling the
processes responsible for subduction initiation and subsequent building
of the Caribbean island arc.%
\end{abstract}\selectlanguage{ngerman}%



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