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Geology of the Bunger Hills-Denman glacier region, East Antarctica (1995)

Sheraton, J. W. ; Tingey, R. J. ; Oliver, R. L. ; [et al.]

Canberra : Australian Government Publishing Service

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Call number: AWI G9-96-0440 ; AWI G9-96-0502

Type of Medium: Series available for loan

Pages: x, 124 p. , Ill., graph. Darst., Kt. , 1 Kt.-Beil.

ISBN: 0-644-45247-1

ISSN: 0084-7089

Series Statement: Bulletin / Australian Geological Survey Organisation 244

URL: https://d28rz98at9flks.cloudfront.net/7/Bull_244.pdf

Note: Contents: Abstract. - Introduction. - Bunger Hills-Obruchev Hills area. - Metamorphic rocks. - Pyroxene-quartz-feldspar gneiss. - Mafic granulite. - Ultramafic rocks. - Garnet-quartz-feldspar gneiss. - Aluminous metasediments. - Quartzite. - Calc-silicate rocks and marble. - Igneous rocks. - Mafic to felsic plutonic rocks. - Felsic dykes and minor intrusions. - Mafic dykes. - Rapakivi granite and felsic volcanics. - Denman Glacier Area. - Metamorphic rocks. - Felsic orthogneiss. - Mafic rocks. - Ultramafic rocks. - Garnet-quartz-feldspar gneiss. - Metasediments. - Igneous rocks. - Mafic to felsic plutonic rocks. - Felsic dykes and minor intrusions. - Mafic dykes. - Mount Amundsen and Mount Sandow. - Sandow Group. - Sediments. - Metabasalt. - Structural Geology. - Bunger Hills area. - D1 deformation. - D2 deformation. - D3 deformation. - D4 deformation. - Denman Glacier area and Mounts Amundsen and Sandow. - Metamorphism. - Bunger Hills area. - Peak metamorphism. - Retrograde metamorphism. - Denman Glacier area. - Discussion. - Geological history of the Bunger Hills area. - Regional correlations. - Gondwana reconstruction and tectonic synthesis. - Gondwana correlations. - Acknowledgements. - References. - Appendix: Chemical analyses of rock samples rom the Bunger Hills and Denman Glacier areas. - Analytical methods. - Precision and accuracy.

Location: AWI Reading room

Branch Library: AWI Library

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The Rayner Complex of East Antarctica: complex isotopic systematics within a Proterozoic mobile belt (1987)

BLACK, L. P. ; HARLEY, S. L. ; SUN, S. S. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Journal of metamorphic geology 5 (1987), S. 0

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ISSN: 1525-1314

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences

Notes: Abstract New isotopic (Rb–Sr, U–Pb zircon and Sm–Nd) and petrological data are presented for part of an extensive Proterozoic mobile belt (locally known as the Rayner Complex) in East Antarctica. Much of the belt is the product of Mid-Proterozoic (∼ 1800–2000 Ma) juvenile crustal formation. Melting of this crust at about 1500 Ma ago produced the felsic magmas from which the dominant orthogneisses of this terrain were subsequently derived. Deformation and transitional granulite-amphibolite facies conditions (which peaked at 750 ± 50°C and 7–8 kbar (0.7–0.8 GPa) produced open to tight folding about E–W axes and syn-tectonic granitoids about 960 Ma ago. Subsequent felsic magmatism occurred at about 770 Ma and not, as has been widely advocated, at 500–550 Ma, which appears to have been a time of widespread upper greenschist facies (400–500°C) metamorphism, localized shearing and faulting.Sm-Nd model ages of 1.65–2.18 Ga disprove a previously favoured hypothesis that the Rayner Complex mostly represents reworked Archaean rocks from the neighbouring craton (Napier Complex). Models that involve rehydration of the Napier Complex are no longer required, since the Rayner Complex was its own source of water. Two episodes of Proterozoic crustal growth are identified, the later of which occurred between about 1200 Ma and 1000 Ma, and was relatively minor. Sedimentation took place only shortly before Late Proterozoic orogenesis.The multiphase history of the Rayner Complex has resulted in complex isotopic behaviour. Three temporally discrete episodes of Pb loss from zircon have been identified, the earliest two of which are responses to the c. 960 Ma and 540 Ma tectonothermal events. Fluid leaching was operative during the later event for there is a good correlation between degree of isotopic discordance and secondary mineral growth. Pb loss during the high-grade event was probably governed by the same process or by lattice annealing. Some zircon suites also document recent Pb loss. Most lower concordia intercepts have no direct geological meaning and are explicable as mixed ages produced by incomplete Pb loss during two or more secondary events. Whereas all zircon separates from the orthogneisses produce U–Pb isotopic alignments, zircons from the only analysed paragneiss produce scattered data, in part reflecting a range of provenance. The 960 Ma event was also associated with the growth of a characteristically low U zircon (∼ 300 μg/g) in rocks of inferred high Zr content.There is ubiquitous evidence for the resetting of Rb–Sr total-rock isochrons. Even samples separated by up to 10 km fail to produce igneous crystallization ages. Minor mineralogical changes produced by the 540 Ma upper greenschist-facies metamorphism were sufficient to almost completely reset some Rb–Sr isochrons and to produce open system conditions on outcrop scale, at least in one location.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1525-1314.1987.tb00366.x

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Unsupported radiogenic Pb in zircon: a cause of anomalously high Pb-Pb, U-Pb and Th-Pb ages (1984)

Williams, I. S. ; Compston, W. ; Black, L. P. ; [et al.]

Springer

Contributions to mineralogy and petrology 88 (1984), S. 322-327

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Ion microprobe U-Th-Pb isotopic analyses of zircons from a granodioritic orthogneiss from the Napier Complex, Mount Sones, Enderby Land, Antarctica, have identified an unambiguous example of unsupported radiogenic Pb in a 3,950 Ma-old crystal. At one 40 μm spot on the crystal an unusually large heterogeneity in Pb content was found, the concentration of radiogenic Pb ranging from 5 to 50 percent higher than could have been generated in 3,950 Ma by radioactive decay of the co-existing U and Th. This relative excess of radiogenic Pb is attributed to Pb gain rather than to U and Th loss because first, the Pb content varied by more than the U or Th contents and secondly, changes in the Pb/U, Pb/Th and Pb isotopic composition correlated directly with changes in the Pb concentration. The individual 207Pb/206Pb apparent ages ranged from 4,000 Ma to 4,145 Ma, all greater than the inferred age of the crystal. A correlation between 207Pb/206Pb and Pb/U shows that the Pb excess has not resulted from recent Pb movement. The spot apparently gained radiogenic Pb about 2,500 Ma ago, at the same time as the majority of the other zircons in the rock suffered substantial Pb loss. The Pb movement occurred in response to a discrete geologic event. Reverse discordance is a phenomenon that must be considered when interpreting zircon U-Pb ages, especially 207Pb/206Pb ages of single crystals or portions of crystals.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00376756

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Four zircon ages from one rock: the history of a 3930 Ma-old granulite from Mount Sones, Enderby Land, Antarctica (1986)

Black, L. P. ; Williams, I. S. ; Compston, W.

Springer

Contributions to mineralogy and petrology 94 (1986), S. 427-437

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Ion microprobe U-Th-Pb analyses of zircons from a granulite-grade orthogneiss from Mount Sones, Enderby Land, Antarctica, record the ages of four principal events in the history of the gneiss, three of which already have been recognized through previous isotopic dating of other samples. The structure of the zircons indicates at least four different stages of growth. The several zircon ages were obtained by grouping the analyses according to the stage they represented in the observed “stratigraphic succession” of growth and thereby defining separate U-Pb discordance patterns for each stage. The stratigraphically oldest zircon (rare discrete cores) is indistinguishable in age from the most common, euhedrally zoned zircon. Both crystallized when the tonalitic precursor of the orthogneiss was emplaced into the crust 3927±10 Ma ago, making the orthogneiss currently the oldest known terrestrial rock. The outer parts of most grains and some whole grains recrystallized at 2948±31/−17 Ma, during or immediately after possibly ∼100 Ma of high granulite grade metamorphism. The recrystallized zircon was isotopically disturbed by tectonism associated with reactivation of the southern margin of the Napier Complex at ∼1000 Ma. In the intervening time, at 2479±23 Ma, the cores and zoned zircon suffered a major isotopic disturbance involving movement of radiogenic Pb which left most of the crystals with radiogenic Pb deficiencies, but produced local radiogenic Pb excesses in others. A new generation of zircon, characterized by very high Th/U and low U, grew at that time. That event — deformation and possibly a minor rise in temperature — produced widespread perturbations of other isotopic systems throughout the Napier Complex.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00376336

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Geochemistry and geochronology of proterozoic tholeiite dykes of east antarctica: evidence for mantle metasomatism (1982)

Sheraton, J. W. ; Black, L. P.

Springer

Contributions to mineralogy and petrology 78 (1982), S. 305-317

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Two episodes of tholeiite dyke emplacement have been identified in Archaean high-grade metamorphics of the Napier Complex in Enderby Land. Middle Proterozoic Amundsen dykes are typical continental tholeiites and most of the chemical variation in individual suites can be explained in terms of different degrees of partial melting and low-pressure crystal fractionation. Group I Amundsen tholeiites were derived from a relatively homogeneous source region 1,190±200 m.y. ago, whereas that of the group II Amundsen tholeiites was chemically and isotopically heterogeneous. Group II dykes have various degrees of enrichment in incompatible elements, and commonly show normalised trace element abundance patterns with negative Nb anomalies. These features imply variable metasomatism of the source region by a volatile-rich fluid phase (rather than a melt of any observed igneous composition) enriched in K, Rb, Ba, Th, and possibly La and Ce. Early Proterozoic (2,350±48 m.y.) tholeiites were emplaced at considerable depths in the crust during the waning stages of granulite-facies metamorphism and include a high-Mg suite of possible komatiitic affinity, ranging in composition from hypersthene-rich tholeiite (norite) to quartz-rich tholeiite. They tend to have higher ratios of highly to moderately incompatible elements (e.g., K/Zr, K/Ce), and larger Nb anomalies (i.e., higher K/Nb) compared with middle Proterozoic tholeiites, suggesting derivation from more enriched source regions. Isotopic data are not compatible with significant crustal contamination, but constrain source metasomatism to a time immediately before emplacement. Metasomatism of the source region of the much younger group I tholeiites may have been contemporaneous with that of the high-Mg suite.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00398925

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The petrogenesis of an I-type volcanic-plutonic suite: The St. Marys Porphyrite, Tasmania (1986)

Higgins, N. C. ; Turner, N. J. ; Black, L. P.

Springer

Contributions to mineralogy and petrology 92 (1986), S. 248-259

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract The Devonian I-type St. Marys Porphyrite (388±1Ma) comprises two petrographically similar units, an 800 m thick pyroclastic sheet (compositionally dacite and rhyolite) and a subvolcanic feeder dyke. The pyroclastics are crystal-rich and contain (in order of decreasing abundance) plagioclase, quartz, biotite, augite, hypersthene and sanidine phenocrysts in an aphanitic groundmass. The early phenocryst assemblage clinopyroxene+orthopyroxene+plagioclase was followed by crystallisation of less magnesian pyroxene, more sodic plagioclase and biotite, quartz and K-feldspar. The phenocrysts crystallised at high temperature, between 1,000°-850° C, and at a pressure of 2.5±1 kb from a water undersaturated (〈2.5 wt.%) magma in a chamber underlying the intrusive centre. At least two eruptive phases are present in the pyroclastic pile, each commencing with rhyolite. Bulk chemical variation probably reflects a zonation in the magma chamber prior to eruption. The low pressure phenocryst crystallisation conditions and the pyroxene Fe-enrichment trend with falling temperature support a fractional crystallisation model. The chemical variation can be explained by 20% fractional crystallisation involving plagioclase, quartz, biotite and pyroxene in proportions similar to modal phenocryst abundances. Volcanics like the St. Marys Porphyrite preserve evidence of their early magmatic history by quenching of mineral phases. Textural relationships and physico-chemical parameters deduced from the St. Marys Porphyrite are applicable to the interpretation of I-type granitoids in eastern Australia and elsewhere and constrain petrogenetic models for their genesis. Pyroxene cores of hornblende grains, pyroxene inclusions in plagioclase and corroded cores of plagioclase crystals may be formed through magmatic crystallisation and need not represent restite.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00375298

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Isotopic Composition and Possible Genesis of Ore Leads in North-Eastern Queensland, Australia (1972)

Black, L. P. ; Richards, J. R.

Society of Economic Geologists

In: Economic Geology. 1972; 67(8): 1168-1179. Published 1972 Dec 01. doi: 10.2113/gsecongeo.67.8.1168.

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Publication Date: 1972-12-01

Print ISSN: 0361-0128

Electronic ISSN: 1554-0774

Topics: Geosciences

Published by Society of Economic Geologists

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Zircon ages and the distribution of Archaean and Proterozoic rocks in the Rauer Islands (1993)

Kinny, P. D. ; Black, L. P. ; Sheraton, J. W.

Cambridge University Press

In: Antarctic Science. 1993; 5(2): 193-206. Published 1993 Jun 01. doi: 10.1017/s0954102093000252.

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Publication Date: 1993-06-01

Description: The application of zircon U-Pb geochronology using the SHRIMP ion microprobe to the Precambrian high-grade metamorphic rocks of the Rauer Islands on the Prydz Bay coast of East Antarctica, has resulted in major revisions to the interpreted geological history. Large tracts of granitic orthogneisses, previously considered to be mostly Proterozoic in age, are shown here to be Archaean, with crystallization ages of 3270 Ma and 2800 Ma. These rocks and associated granulite-facies mafic rocks and paragneisses account for up to 50% of exposures in the Rauer Islands. Unlike the 2500 Ma rocks in the nearby Vestfold Hills which were cratonized soon after formation, the Rauer Islands rocks were reworked at about 1000 Ma under granulite to amphibolite facies conditions, and mixed with newly generated felsic crust. Dating of components of this felsic intrusive suite indicates that this Proterozoic reworking was accomplished in about 30–40 million years. Low-grade retrogression at 500 Ma was accompanied by brittle shearing, pegmatite injection, partial resetting of U-Pb geochronometers and growth of new zircons. Minor underformed lamprophyre dykes intruded Hop and nearby islands later in the Phanerozoic. Thus, the geology of the Rauer Islands reflects reworking and juxtaposition of unrelated rocks in a Proterozoic orogenic belt, and illustrates the important influence of relatively low-grade fluid-rock interaction on zircon U-Pb systematics in high-grade terranes.

Print ISSN: 0954-1020

Electronic ISSN: 1365-2079

Topics: Biology , Geography , Geosciences