Electronic Resource
Oxford, UK
:
Blackwell Science Inc
Journal of metamorphic geology
17 (1999), S. 0
ISSN:
1525-1314
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
Shrimp U–Pb zircon dating of structurally constrained felsic orthogneiss samples in the western Musgrave Block has been used to delineate discrete magmatic and metamorphic events at c.1300 and c.1200 Ma. The dating of pre-D1 and post-D1 felsic orthogneiss constrains D1 to have occurred at 1312±16 to 1324±4 Ma. This is the first geochronological study to identify such a metamorphic and deformation event in the Musgrave Block. D1 was accompanied by a major magmatic event involving the emplacement of voluminous felsic orthogneiss between 1296 and 1324 Ma. Zircon overgrowths on numerous igneous zircon cores give a consistent age of c.1200 Ma, reflecting zircon growth during a second high-grade metamorphic event (D2). This c.1200 Ma metamorphic event was followed by the intrusion of a c.1190 Ma megacrystic granite. The c.1300 and c.1200 Ma events in the Musgrave Block can be tentatively correlated with metamorphic events in the Albany-Fraser Orogen, and the Windmill Islands and Bunger Hills in east Antarctica. A major continuous Grenville-age orogenic belt joining these areas may have represented a plate boundary between the pre-Rodinian proto-Australian continent and proto-Antarctica during the formation of Rodinia in the Mesoproterozoic.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1046/j.1525-1314.1999.00211.x
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