DAMPIER RIDGE, TASMAN SEA, AS A STRANDED CONTINENTAL FRAGMENT

Dredging of the Dampier Ridge recovered small fragments of granite, ga bbro and sandstone. Dating of the igneous samples by the U-Pb, K-Ar an d Rb-Sr methods yielded precise ages mainly in the range 250 to 270 Ma , mid-Permian. An imprecise Sm-Nd mineral age of approximately 310 Ma might reflect slightly earlier emplacement of the gabbro. A granitic f ragment has a composition approximating that a manimum melt. Taken tog ether with the Late Palaeozoic emplacement ages and other geochemical and geophysical data, the evidence strongly supports the conclusion th at the Dampier Ridge is a continental fragment, formerly part of easte rn Australia, with its present location a consequence of continential rifting and opening of the Tasman Basin by sea-floor spreading.