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Lachlan Orogen subduction‐accretion systematics revisited

Geological and Ar–;Ar data provide a link between the formation of mélange, now preserved in the Howqua River region (Governor Fault Zone, central Lachlan Orogen), and ca 450–420 Ma east‐directed subduction that contributed to formation of the Tabberabbera Zone. These data support a previously presented model comprising three accretionary subduction zones to explain closure of a marginal ocean basin. An additional, west‐dipping subduction zone at ca 470 Ma has recently been suggested for the central and western Lachlan Orogen boundary, but is not required to explain the field relationships and chronology.