GEOLOGY OF THE BUNGER HILLS AREA, ANTARCTICA - IMPLICATIONS FOR GONDWANA CORRELATIONS

被引：39

作者：

SHERATON, JW

TINGEY, RJ

BLACK, LP

OLIVER, RL

机构：

[1] Australian Géological Survey Organisation, Canberra City, ACT 2601

[2] Department of Geology and Geophysics, University of Adelaide, Adelaide, SA, 5001

来源：

ANTARCTIC SCIENCE | 1993年 / 5卷 / 01期

关键词：

PROTEROZOIC; GRANULITE-FACIES METAMORPHISM; PLUTONIC ROCKS; MAFIC DYKES; ANTARCTICA-AUSTRALIA CORRELATIONS;

D O I：

10.1017/S0954102093000112

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The Bunger Hills area of the East Antarctic Shield consists of granulite-facies felsic orthogneiss, with subordinate paragneiss and mafic granulite. The igneous precursors of granodioritic orthogneiss were emplaced 1500-1700 Ma ago, and late Archaean (2640 Ma) tonalitic orthogneiss occurs in the nearby Obruchev Hills. Peak metamorphism (M1) (at about 750-800-degrees-C and 5-6kb) occurred 1190 +/- 15 Ma ago (U-Pb zircon age), and was accompanied by the first of three ductile deformations (D1). Emplacement of voluminous, mainly mantle-derived plutonic rocks, ranging from gabbro, through quartz monzogabbro and quartz monzodiorite, to granite, followed between 1170 (during D3) and 1150 Ma. Intrusion of abundant dolerite dykes of four chemically distinct suites at about 1140 Ma was associated with shear zone formation, indicating at least limited uplift; all subsequent deformation was of brittle-ductile type. Alkaline mafic dykes were emplaced 500 Ma ago. Marked geochronological similarities with the Albany Mobile Belt of Western Australia suggest that high-grade metamorphism occurred during collision between the Archaean Yilgarn Craton of Australia and the East Antarctic Shield about 1200 Ma ago.

引用

页码：85 / 102

页数：18

共 73 条

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