Regional oxygen isotope zonation at Broken Hill, New South Wales, Australia; large-scale fluid flow and implications for Pb-Zn-Ag mineralization

SummaryRetrograde metamorphism of gneisses and pegmatites leads in part to the destruction of feldspar and its replacement by late-stage lobate myrmekite and muscovite. Reactions promoted by retrogression suggest a range in volume of quartz production that may supplement that developed by exsolution and lead to deviations from the strict proportionality relationship suggested by previous workers. There is no need, however, to propose that quartz in myrmekite originates by constriction of pre-existing quartz within exsolved albite.

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Myrmekitic and non-myrmekitic plagioclase compositions in gneisses from Broken Hill, New South Wales

Mineralogical Magazine ◽

10.1180/minmag.1970.037.290.14 ◽

1970 ◽

Vol 37 (290) ◽

pp. 729-732 ◽

Cited By ~ 8

Author(s):

Evan R. Phillips ◽

D.M. Ransom

Keyword(s):

New South ◽

New South Wales ◽

Broken Hill ◽

South Wales

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Lead and Nd isotopic evidence for a crustal Pb source of the giant Broken Hill Pb–Zn–Ag deposit, New South Wales, Australia

Ore Geology Reviews ◽

10.1016/j.oregeorev.2014.09.012 ◽

2015 ◽

Vol 65 ◽

pp. 228-244

Author(s):

Massimo Raveggi ◽

David Giles ◽

John Foden ◽

Sebastien Meffre ◽

Ian Nicholls ◽

...

Keyword(s):

New South ◽

New South Wales ◽

Isotopic Evidence ◽

Broken Hill ◽

South Wales

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Variation in algal assemblages on wave-exposed rocky shores in New South Wales

Marine and Freshwater Research ◽

10.1071/mf97207 ◽

1998 ◽

Vol 49 (3) ◽

pp. 241 ◽

Cited By ~ 35

Author(s):

A. J. Underwood ◽

M. G. Chapman

Keyword(s):

Large Scale ◽

New South ◽

New South Wales ◽

Temporal Patterns ◽

Explanatory Models ◽

Small Scale ◽

Rocky Shores ◽

Spatial And Temporal Patterns ◽

South Wales ◽

Algal Assemblages

Data were collected in New South Wales from replicate sites on five wave-exposed shores separated by hundreds of kilometres at three-monthly intervals for four years, to examine large and small spatial and temporal patterns in low-shore algal assemblages. These data were used to test hypotheses from the models that algal assemblages show large-scale, predictable changes in structure or, alternatively, that variation from time to time is small-scale and differs from shore to shore or site to site on a shore. There was considerable variation at all scales examined — among replicate quadrats within sites, between sites on a shore and among shores. Similarly, assemblages differed from one sampling period to the next and changes in the assemblages over time periods of three months were as great as from year to year. These changes were interactive, with no two sites or shores showing similar temporal patterns. Thus, understanding diversity along a coast-line requires detailed understanding of local processes. Without adequate spatial and temporal replication in sampling designs and without explanatory models, the large and complex variability in intertidal assemblages at different scales cannot be documented and understood.

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Large-scale patterns in habitat structure on subtidal rocky reefs in New South Wales

Marine and Freshwater Research ◽

10.1071/mf99008 ◽

2000 ◽

Vol 51 (3) ◽

pp. 255 ◽

Cited By ~ 47

Author(s):

N. L. Andrew ◽

A. L. O'Neill

Keyword(s):

Sea Urchin ◽

Geographical Information Systems ◽

Large Scale ◽

Size Structure ◽

New South ◽

New South Wales ◽

Geographical Information ◽

South Wales ◽

Subtidal Rocky Reefs ◽

A Site

Aerial photography was used to estimate the representation of shallow subtidal habitats in New South Wales. Sixty sites, each between 4 and 5 hectares, were mapped with Geographical Information Systems software using ortho-rectified images digitized from 1:8000-scale photographs and ‘ground truthed’ in the field by divers. Barrens habitat covered an estimated 50% (s.e. = 3.9) of nearshore reefs between Port Stephens and Disaster Bay. Coverage of barrens habitat was greatest in Disaster Bay (68%, s.e. = 6.7) and least south of Disaster Bay (1%, s.e. = 0.3). There were clear differences among localities in the area of reef within the mapped sites; those at Cape Howe, Nadgee, and Turingal were significantly smaller in area than all others. There was no clear latitudinal trend in these differences but there was evidence of sand inundation at a site at Nadgee, where the reef was small. Differences in the densities and size-structure of the sea urchin Centrostephanus rodgersiiat 27 of the mapped sites provide a basis for testing relationships between the demography of this species and the persistence of the barrens habitat. The extensive coverage of the barrens habitat in New South Wales is likely to limit the productivity of the abalone industry. The development of a sea urchin fishery may have large impacts on habitat representation on nearshore reefs.

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