NEW U-PB ZIRCON AGES FROM THE DENMAN GLACIER AREA, EAST ANTARCTICA, AND THEIR SIGNIFICANCE FOR GONDWANA RECONSTRUCTION

被引：53

作者：

BLACK, LP

SHERATON, JW

TINGEY, RJ

MCCULLOCH, MT

机构：

[1] Bureau of Mineral Resources, Canberra, Canberra, A.C.T. 2601

[2] Research School of Earth Sciences, Australian National University, Canberra, Canberra, A.C.T. 2601

来源：

ANTARCTIC SCIENCE | 1992年 / 4卷 / 04期

关键词：

U-PB GEOCHRONOLOGY; ND ISOTOPES; EAST ANTARCTICA; GONDWANA;

D O I：

10.1017/S095410209200066X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Two new U-Pb zircon ages from the area immediately west of Denman Glacier in Antarctica show that its geological history differs from that of the Obrucbev Hills and Bunger Hills, to the east of the glacier, A crystallization age of 516.0 +/- 1.5 Ma for syenite is by far the youngest primary age reported for this region, whereas tonalitic orthogneiss from Cape Charcot, the oldest known local rock, was derived by the high-grade metamorphism and deformation at 2889 +/- 9 Ma of a 3003 +/- 8 Ma igneous precursor. Both major populations of zircon in this rock lost Pb at 500-600 Ma. Although the Sm-Nd characteristics of the entire region resemble those of the Albany Mobile Belt of Western Australia, the Sm-Nd systematics of the felsic gneisses and plutonics are too old to allow direct correlation with the rocks of the Naturaliste Block (Western Australia), a potential key element for Gondwana reconstruction. However, the possibility exists that there is an indirect relationship between the Naturaliste Block and the region immediately west of Denman Glacier.

引用

页码：447 / 460

页数：14

共 33 条

[1]

BLACK L.P., MCCULLOCH M.T., Evidence for isotopic equilibration of Sm-Nd whole-rock systems in early Archaean crust of Enderby Land, Antarctica, Earth and Planetary Science Letters, 82, pp. 15-24, (1987)

[2]

BLACK L.P., SHERATON J.W., The influence of Precambrian source components on the U-Pb zircon age of a Palaeozoic granite from northern Victoria Land, Antarctica, Precambrian Research, 46, pp. 275-293, (1990)

[3]

BLACK L.P., HARRIS L.B., DELOR C.P., Reworking of Archaean and Early Proterozoic components during a progressive, Middle Proterozoic tectonothermal event in the Albany Mobile belt, Western Australia, Precambrian Research

[4]

COMPSTON W., ARRIENS P.A., The Precambrian geochronology of Australia, Canadian Journal of Earth Science, 5, pp. 561-583, (1968)

[5]

COMPSTON W., WILLIAMS I.S., MYER C., U-Pb geochronology of zircons from lunar breccia 73217 using a sensitive high mass-resolution ion-microprobe, Proceedings of the 14th Lunar science Conference, Journal of Geophysical Research, 89, (1984)

[6]

COOPER J.A., COMPSTON W., Rb-Sr dating within the Houghton Inlier, South Australia, Journal of the Geological Society of Australia, 17, pp. 213-219, (1971)

[7]

DELAETER J.R., LIBBY W.G., TRENDALL A.F., The older Precambrian geochronology of Western Australia, Special Publications of the Geological Society of Australia, 7, pp. 3-18, (1981)

[8]

GRIFFITHS J.R., Revised continental fit of Australia and Antarctica, Nature, 249, pp. 336-338, (1974)

[9]

KROGH T.E., A low-contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determination, Geochimica et Cosmochimica Acta, 37, pp. 485-494, (1973)

[10]

LAIRD M.G., COOPER R.A., JAGO J.B., New data on the Lower Palaeozoic sequences of northern Victoria Land, Antarctica, and its significance for Australian-Antarctic relationships in the Palaeozoic, Nature, 265, pp. 107-110, (1977)

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