Sediment geochemistry and base metal sulphide mineralisation in the Quidong area, Southeastern New South Wales, Australia

1989 ◽  
Vol 24 (2) ◽  
Author(s):  
K.G. McQueen
Keyword(s):  
Base Metal ◽  
New South ◽  
New South Wales ◽  
Sediment Geochemistry ◽  
Base Metal Sulphide ◽  
Metal Sulphide ◽  
South Wales ◽  
Sulphide Mineralisation

An occurrence of todorokite in the deuteric stage of a basalt

1968 ◽  
Vol 36 (282) ◽  
pp. 757-760 ◽  
Author(s):  
L. J. Lawrence ◽  
P. Bayliss ◽  
Paul Tonkin
Keyword(s):  
Base Metal ◽  
New South ◽  
New South Wales ◽  
Ore Deposits ◽  
South Wales ◽  
Tertiary Basalt

SummaryAn occurrence of todorokite having a formula is recorded from Ardglen, 150 miles N.N.W. of Sydney, New South Wales. The composition of Ardglen todorokite is somewhat simpler than previously recorded occurrences, most of which were in manganese and manganese—base-metal ore deposits. The simpler composition is explained in terms of its occurrence as a late deuteric mineral associated with manganocalcite and zeolites in an altered Tertiary basalt. The manganese is believed to have been derived from the deuteric alteration of the augite of the basalt.

The preservation of pre-metamorphic colloform banding in pyrite from the Broken Hill-type Pinnacles deposit, New South Wales, Australia

1994 ◽  
Vol 58 (392) ◽  
pp. 461-471 ◽  
Author(s):  
Joanna Parr
Keyword(s):  
Base Metal ◽  
New South ◽  
Granulite Facies ◽  
Hydrothermal Fluids ◽  
Granulite Facies Metamorphism ◽  
Broken Hill ◽  
South Wales ◽  
Facies Metamorphism ◽  
Sulphide Mineralisation ◽  
Five Phases

AbstractTwo distinct generations of pyrite, with different morphologies, are described from the Proterozoic Broken Hill-type Pinnacles deposit in western NSW. The earlier, py1, forms concentric layers interpreted as colloform banding. Although the textures are somewhat similar to those observed in supergene alteration zones, textural relationships in fresh rocks suggest that these are pre-metamorphic and that the pyrite formed as the result of precipitation from hydrothermal fluids in open veins, vugs and fissures. The second generation, py2, post-dates py1 and forms euhedral overgrowths on it. It is interpreted as being synchronous with the main phase of base metal sulphide mineralisation. The textures reported here are previously unrecorded for Broken Hill-type mineralisation, and have implications for the regional identification of feeder zones to the Broken Hill deposit. The evidence supports a model in which mineralising conditions at the Pinnacles were characterised by slightly higher oxygen and lower sulphur fugacity (further constrained by Fe contents of sphalerite) than at Broken Hill, where pyrrhotite is the major Fe sulphide.The pre-metamorphic textures observed in the pyrite at the Pinnacles deposit are also unusual because they have survived granulite facies metamorphism and five phases of deformation, whereas previously the preservation of such textures has not been recognised at metamorphic grades greater than amphibolite facies.

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