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U-Th-Pb monazite dating and the timing of arc-continent collision in East Timor

Citation

Berry, R and Thompson, J and Meffre, S and Goemann, K, U-Th-Pb monazite dating and the timing of arc-continent collision in East Timor, Australian Journal of Earth Sciences, 63, (4) pp. 367-377. ISSN 0812-0099 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Geological Society of Australia

DOI: doi:10.1080/08120099.2016.1217930

Abstract

The 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.

Item Details

Item Type:Refereed Article
Keywords:Timor, monazite
Research Division:Earth Sciences
Research Group:Geology
Research Field:Tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Berry, R (Associate Professor Ron Berry)
Author:Thompson, J (Mr Jay Thompson)
Author:Meffre, S (Dr Sebastien Meffre)
Author:Goemann, K (Dr Karsten Goemann)
ID Code:111962
Year Published:2016
Web of Science® Times Cited:1
Deposited By:CODES ARC
Deposited On:2016-10-18
Last Modified:2017-10-24
Downloads:0

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