The Effect Of Detrital Zircon Dating On South Australia

1814 WordsSep 28, 20148 Pages
Introduction With the use of detrital zircon dating, and minor use of authigenic monazite dating, estimations of age constraints can be applied to the Proterozoic basins on the south Australian island, Tasmania. Zircon minerals occur as a trace component in many sedimentary rocks. Therefore due to its widespread occurrence and its relative resistance to both mechanical and chemical weathering, which enhances its chance of survival through processes of transportation, dating methods through zircon minerals have become a standard for dating sedimentary basins (Black et al). The Rocky Cape Group of northwest Tasmania provides an insight into the record of the passive margin sedimentation and has the potential to constrain Tasmania’s position historically within the meso-neoproterozoic supercontinent reconstructions (Halpin). A number of studies have been conducted such as Black et al (2004) Berry et al (2008) and Halpin et al (2014), mainly on the Western Tasmanian Terrane, in an effort to constrain a position in past supercontinent amalgamations and to challenge the hypothesis of many supercontinent models such as SWEAT and AUSWUS that Tasmania was positioned in close proximity to the past North American continent, Laurentia. Geologic Setting Tasmania The geologic setting of Tasmania is characterized by Proterozoic sedimentary basins with varying origins that outcrop predominetly in the north-western regions of Tasmania. The depositional history of Tasmania can be split

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