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In the remainder of the introduction the background relevant for the
investigation of the hydrography and dynamics within the rift valley of
the \MAR \rsec{BG-MAR} and for hydrothermal dispersal and flux
calculations \rsec{BG-HT} is reviewed. (Additional background
concerning the interpretation of hydrothermal particle plume signatures
and hydrographic anomalies is reviewed in the introductions to
\rchapsNP{plume}{NESPI}.) The study site is described in
\rsecsNP{AMAR}{Rainbow}. The data sets and methods are presented in
\rchapNP{methods}.

In the following three chapters the hydrographic \rchap{HYD},
current-meter \rchap{CM}, and particle-plume observations \rchap{plume}
are analyzed and interpreted. In \rchapNP{NESPI} two new methods for
calculating hydrographic anomalies associated with hydrothermal
particle plumes are developed and applied to the \F data sets.
Combining the hydrographic, dynamical and plume observations, heat flux
estimates are derived in \rchapNP{HFLUX}.

In \rchapNP{mixing} mass and heat budgets of the rift valley are used
to asses the importance of geothermal heating, to investigate the
pathways of the rift-valley water, and to estimate bulk diapycnal
diffusivities. In \rchapNP{BOF} a simple model for the flow within the
rift valley is developed.

The thesis ends with a summary of the main findings and conclusions,
followed by a discussion (and some speculation) regarding their
implications \rchap{concs}. There are no appendices. (Some of the work
presented here has recently been accepted for publication by
\emph{JGR--Oceans} \cite{jour/RainbowHYD}; the sections covered in the
paper are \ref{sec:F-methods}, \ref{sec:HYD-1997}, \ref{sec:P-1997},
and \ref{sec:HF-advective}).