6492 23 archive 379 disk0/00/00/64/92 2008-05-29 04:33:53 2008-07-18 10:59:03 2008-07-16 17:25:22 article show Ron.Berry@utas.edu.au Berry RF Ron.Berry@utas.edu.au Chmielowski RM Steele DA Meffre S Sebastian.Meffre@utas.edu.au pub 260100 restricted Delamerian Orogeny, geochronology, metamorphism, monazite, Ross Orogeny, Tasmania, Tyennan Orogeny. The definitive version is available online at http://www.informaworld.com/smpp/content? Chemical U– Th – Pb dating of monazite from 12 schists throughout western and central Tasmania define a peak metamorphic age of ca 510 Ma. This age is very close to the age of arc – continent collision and ophiolite emplacement, implying very rapid uplift and cooling. To the south, along the western margin of the South Tasman Rise, metamorphism occurred later at 495 Ma, which correlates with a late stage of the Ross Orogeny, Antarctica. The Tyennan Orogeny in Tasmania has a three-stage history similar in age to the Delamerian Orogeny in South Australia. However, the Tyennan Orogeny only produced metamorphic rocks during the early stage associated with ophiolite obduction at 515 – 505 Ma. The intense compressional event recognised in the Delamerian and Ross Orogeny at 500 – 495 Ma is correlated with a mild basin inversion in Tasmania, and no metamorphism on mainland Tasmania has been recognised associated with this event. The westernmargin of the South Tasman Rise is a fragment of the Ross Orogen and does not correlate directly with Tasmania. 2007-07 published Australian Journal of Earth Sciences 54 5 757-771 10.1080/08120090701305269 TRUE 0812-0099 http://dx.doi.org/10.1080/08120090701305269 5339 4 6492 1 application/pdf en staffonly cc_utas

51584.pdf

51584.pdf 2657959 http://eprints.utas.edu.au/6492/1/51584.pdf