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U-Th-Pb monazite dating and the timing of arc-continent collision in East Timor
journal contribution
posted on 2023-05-18, 23:00 authored by Ronald BerryRonald Berry, Thompson, J, Sebastien MeffreSebastien Meffre, Karsten GoemannKarsten GoemannThe Timor Orogen represents one of the youngest arc–continent collisions exposed on the Earth. It has the potential to provide some of the key parameters about how this style of orogeny evolves. However, the metamorphic age of the highest-grade rocks formed in the collision remains controversial. Using U–Th–Pb dating of monazite from amphibolite-grade sillimanite and garnet-bearing schists we show the peak metamorphism occurred at 5.5–4.7 Ma. The young age of the monazite and the presence of significant amounts of common Pb required the development of a new protocol to simultaneously account for the 230Th disequilibrium and the 207Pb common Pb correction. The new estimate of metamorphic age is consistent with the estimates based on plate reconstructions for the initiation of arc–continent collision in East Timor. The metamorphic event is a result of this collision.
History
Publication title
Australian Journal of Earth SciencesVolume
63Issue
4Pagination
367-377ISSN
0812-0099Department/School
School of Natural SciencesPublisher
Taylor & FrancisPlace of publication
United KingdomRights statement
Copyright 2016 Geological Society of AustraliaRepository Status
- Restricted