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Chemical U–Th–Pb monazite dating of the Cambrian Tyennan Orogeny, Tasmania


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Berry, RF, Chmielowski, RM, Steele, DA and Meffre, S 2007 , 'Chemical U–Th–Pb monazite dating of the Cambrian Tyennan Orogeny, Tasmania' , Australian Journal of Earth Sciences, vol. 54, no. 5 , pp. 757-771 , doi: 10.1080/08120090701305269.

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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.

Item Type: Article
Authors/Creators:Berry, RF and Chmielowski, RM and Steele, DA and Meffre, S
Keywords: Delamerian Orogeny, geochronology, metamorphism, monazite, Ross Orogeny, Tasmania, Tyennan Orogeny.
Journal or Publication Title: Australian Journal of Earth Sciences
ISSN: 0812-0099
DOI / ID Number: 10.1080/08120090701305269
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