CALC-SILICATE LENSES IN THE EARLY PALEOZOIC MUD-PILE OF THE LACHLAN FOLD BELT

Small lenses of calc-silicate rock occur widely throughout the quartz- rich turbidite succession of the Lachlan Fold Belt of southeastern Aus tralia, mainly within contact aureoles and regionally metamorphosed ro cks of medium to high grade. Metamorphic assemblages are typically qua rtz-plagioclase-clinozoisite-titanite+/-garnet at medium grade and qua rtz-anorthite-clinopyroxene-titanite+/-garnet at high grade. Low-grade equivalents include calcite-bearing slate and calcite-rich psammite. The lenses are elongate parallel to bedding and probably formed as cal careous concretions.