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Geochronology of zircon megacrysts from nepheline-bearing gneisses as constraints on tectonic setting: implications for resetting of the U-Pb and Lu-Hf isotopic systems

Ashwal, L. D.; Armstrong, Richard; Roberts, R.J.; Schmitz, Mark; Corfu, Fernando; Hetherington, C.J.; Burke, K.; Gerber, M.

Description

Nepheline-bearing gneisses from the 75 km2 Tambani body in the Mozambique Belt of southern Malawi, are miaskitic biotite-nepheline monzodiorites, reflecting an absence of K-feldspar, alkali amphiboles or pyroxenes, and contain euhedral zircon megacrysts up to 5 cm across. The zircons contain U = 1-1,860 ppm, Th = 0-2,170 ppm and Y = 400-1,100 ppm, and very low concentrations of all other measured trace elements except Hf (HfO2 = 0.53-0.92 wt. %). Cathodoluminescence images reveal oscillatory...[Show more]

CollectionsANU Research Publications
Date published: 2007
Type: Journal article
URI: http://hdl.handle.net/1885/21020
Source: Contributions to Mineralogy and Petrology
DOI: 10.1007/s00410-006-0153-9

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