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\begin{document}

\title{Subduction and obduction processes: the fate of oceanic lithosphere
revealed by blueschists, eclogites and ophiolites}



\author[1]{Philippe Agard}%
\author[1]{Mathieu Soret}%
\author[1]{Guillaume Bonnet}%
\author[1]{Dia Ninkabou}%
\author[2]{Alexis Plunder}%
\author[3]{Cécile Prigent}%
\author[4]{Philippe Yamato}%
\affil[1]{Sorbonne Université}%
\affil[2]{BRGM}%
\affil[3]{Sorbonne Paris Cité}%
\affil[4]{Géosciences Rennes}%


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  \date{May 24, 2024}


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\begin{abstract}
Fragments of former oceans are commonly observed in mountain belts:
blueschists and eclogites, on the one hand, and ophiolites, on the other
hand, are all that remains of ancient oceanic lithosphere. Though
volumetrically subordinate, they provide essential insights into past
geodynamics and into the processes involved in the formation and
destruction of oceanic lithosphere. This contribution apprehends these
two types of oceanic fragments jointly and shows the advantage of doing
so for understanding the dynamics of oceanic convergence, i.e.
subduction and obduction. We examine the intimate relationships between
blueschists/eclogites and ophiolites, as well as the similarities and
differences in the mechanisms leading to their preservation. While the
extensive, unmetamorphosed true ophiolites markedly differ from
fragments of oceanic lithosphere offscraped from the slab during
subduction, at shallow or great depths, both types record the mechanical
behavior and `hiccups' of the subduction plate boundary. Their
preservation also highlights the importance of the evolution of the
subduction regime through time, from the onset of intra-oceanic
subduction to the cessation of continental subduction.%
\end{abstract}%



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