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\section{Discussion}  Four, possibly five distinct diagenetic carbonate phases have been identified in the Visean carbonates of the Peak District \citep{WALKDEN_1991, Hollis_2002}. The last of these, zone 4, is associated with Pb-Zn mineralization and characterized by fracture and vein fill and ascribed to burial diagenesis. A diagenetic and mineralization paragenesis for the Visean limestones of the Peak District has been developed by Walkden and Williams (1991) and Hollis and Walkden (2002). These authors  \subsection{Temperature}