Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9528966 | Chemical Geology | 2005 | 21 Pages |
Abstract
Obtaining precise age data for magmatic and hydrothermal minerals of the Mole Granite is hampered by uncertainties introduced by different corrections required for multiple highly radiogenic minerals crystallising from evolved hydrous granites, including 230Th disequilibrium due to Th/U fractionation during monazite and possibly xenotime crystallization, variable Th/U ratios of the fluids from which xenotime was precipitating, elevated contents of common lead, and post-crystallization lead loss in zircon, enhanced by the fluid-saturated environment. The data imply that monazite can also survive as a liquidus phase in protracted magmatic systems over periods of 106 years. The outlined model is in agreement with prominent chemical core-rim variation of the zircon.
Keywords
Related Topics
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Earth and Planetary Sciences
Geochemistry and Petrology
Authors
Urs Schaltegger, Thomas Pettke, Andreas Audétat, Eric Reusser, Christoph A. Heinrich,