Dampier Ridge, Tasman Sea, as a stranded continental fragment
Loading...
Date
1994
Journal Title
Journal ISSN
Volume Title
Publisher
Taylor and Francis
Abstract
Dredging of the Dampier Ridge recovered small fragments of granite, gabbro and sandstone. Dating of the igneous samples by the U-Pb, K-Ar and 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 fragment has a composition approximating that a manimum melt. Taken together with the Late Palaeozoic emplacement ages and other geochemical and geophysical data, the evidence strongly supports the conclusion that the Dampier Ridge is a continental fragment, formerly part of eastern Australia, with its present location a consequence of continential rifting and opening of the Tasman Basin by sea-floor spreading.
Description
Full text can be accessed
http://www.tandfonline.com/doi/abs/10.1080/08120099408728150
Keywords
Dampier Ridge, Geochemistry, Geochronology, Isotopic dating, Magmatism, Tasman Basin
Citation
McDougall, I., Maboko, M.A.H., Symonds, P.A., McCulloch, M.T., Williams, I.S. and Kudrass, H.R., 1994. Dampier Ridge, Tasman Sea, as a stranded continental fragment∗. Australian Journal of Earth Sciences, 41(5), pp.395-406.