Table T1. Comparison between the bulk composition of the breccia subunits* and the results of this study.

Lithostratigraphic subunit	Bulk composition*	Matrix composition**
IVA	Calcite Plagioclase Chlorite Sericite?	Calcite Plagioclase Chlorite Quartz Illite Expandable clays
IVB	Calcite Plagioclase Chlorite Amphibole Quartz Goethite Ankerite	Calcite Plagioclase Chlorite Quartz Illite Expandable clays Hornblende Apatite Serpentine?
IVC	Calcite Plagioclase Chlorite Quartz Analcime	Calcite Plagioclase Chlorite Quartz Illite Expandable clays Hornblende Serpentine Analcime Andradite

Note: * = Shipboard Scientific Party, 1998; ** = this study.