| Title | New evidence for Palaeoproterozoic tectono-magmatic activities in the southern Prince Charles Mountains, East Antarctica |
| Author | Mikhalsky, E.V.; Belyatsky, B.V.; Roland, N.W. |
| Author Affil | Mikhalsky, E.V., VNIIOkeangeologia, Saint Petersburg, Russian Federation. Other: Bundesanstalt für Geowissenschaften und Rohstoffe, Federal Republic of Germany |
| Source | Polarforschung, 78(3), p.85-94, . Publisher: Alfred-Wegener-Institut für Polar- und Meeresforschung and Deutschen Gesellschaft für Polarforschung, Bremerhaven, Federal Republic of Germany. ISSN: 0032- 2490 |
| Publication Date | 2009 |
| Notes | In English with German summary. 25 refs. GeoRef Acc. No: 296935 |
| Index Terms | Antarctica--East Antarctica; Antarctica--Prince Charles Mountains; absolute age; Antarctica; Cumpston Massif; dates; East Antarctica; gneisses; granite gneiss; granites; igneous rocks; ion probe data; Mac Robertson Land; magmatism; mass spectra; metamorphic rocks; metasedimentary rocks; Mount Newton; nesosilicates; orogeny; orthosilicates; Paleoproterozoic; pegmatite; plutonic rocks; Precambrian; Prince Charles Mountains; Proterozoic; SHRIMP data; silicates; spectra; tectonics; terranes; U/Pb; upper Precambrian; zircon; zircon group |
| Abstract | We present new U-Pb zircon (SHRIMP) data on rocks from Mt Newton and Cumpston Massif in the southern Prince Charles Mountains. Our data demonstrate that Mt Newton was affected by a newly proposed Palaeoproterozoic "Newton" Orogeny at c. 2100- 2200 Ma. Sedimentation, felsic volcanism (c. 2200 Ma), metamorphism and folding, followed by granite intrusion (c. 2100 Ma), suggest development of a trough or aulacogene in the area during the early Palaeoproterozoic. An orthogneiss from Cumpston Massif yielded an age of c. 3180 Ma for granitic protolith emplacement, which is in good agreement with many U-Pb zircon ages from similar rocks in the southern Mawson Escarpment. A syn- to late-tectonic muscovite-bearing pegmatite from Cumpston Massif yielded a c. 2500 Ma date of emplacement, which indicates early Palaeoproterozoic activity in this block, probably in response to a tectono-magmatic episode in the Lambert Terrane bordering the Ruker Terrane in the northeast. The correlation of tectono-magmatic events in both the Ruker and Lambert terranes of the southern Prince Charles Mountains provides evidence for their common evolution during the Proterozoic. |
| Publication Type | journal article |
| Record ID | 87438 |