Metamorphic pyroxenes from the Broken Hill district, New South Wales

1962 ◽  
Vol 33 (259) ◽  
pp. 320-338 ◽  
Author(s):  
R. A. Binns
Keyword(s):  
Solid Solution ◽  
Ferrous Iron ◽  
New South ◽  
Regional Metamorphism ◽  
New South Wales ◽  
Metamorphic Grade ◽  
Detectable Change ◽  
Broken Hill ◽  
South Wales ◽  
Hill District

SummaryThe Archean rocks of the Barrier Ranges, New South Wales, show zones of progressive regional metamorphism of which the highest is characterized by orthopyroxene-bearing basic granulites. Within this zone, further increase in metamorphic grade results in a detectable change in distribution of ferrous iron and magnesium between coexisting orthopyroxene and clinopyroxene, the latter becoming relatively richer in iron. Mutual solid solution between the two pyroxene phases also appears to increase. The value of coexisting pyroxenes as indicators of metamorphic grade is thus established. There are some points of disagreement between the Broken Hill results and previously advanced theories of cation distribution in pyroxenes.

Non-coaxial quartz- and mica-girdles in lineated quartzites from the Broken Hill District, New South Wales

1965 ◽  
Vol 34 (268) ◽  
pp. 396-402 ◽  
Author(s):  
F. C. Phillips
Keyword(s):  
New South ◽  
New South Wales ◽  
Broken Hill ◽  
South Wales ◽  
Hill District

SummaryNon-coaxial quartz- and mic-girdles in lineated quartzites from the Broken Hill District, New South Wales, are described and discussed.

On a new barium plagioclase felspar

1933 ◽  
Vol 23 (143) ◽  
pp. 448-457 ◽  
Author(s):  
S. R. Nockolds ◽  
E. G. Zies
Keyword(s):  
Thin Section ◽  
Rock Type ◽  
New South ◽  
New South Wales ◽  
Broken Hill ◽  
South Wales ◽  
Plagioclase Felspar ◽  
Hill District

In the memoir dealing with the geology of the Broken Hill district, New South Wales, mention is made 1 of a remarkable rock type found in a few places in the vicinity of Broken Hill, which looks not unlike an aplite in the field. A brief description of its appearance in thin section is given. It consists mainly of what appears to be very basic plagioclase. A fair amount of quartz, some epidote and bluishgreen hornblende were noticed, whilst a notable amount of sphene is present.

scholarly journals Compositions of silver halides from the Broken Hill district, New South Wales

1997 ◽  
Vol 49 (3) ◽  
pp. 217-228 ◽  
Author(s):  
Robert D. Gillard ◽  
Alan D. Hart ◽  
D. Alun Humphreys ◽  
R. F. Symes ◽  
P. A. Williams
Keyword(s):  
New South ◽  
New South Wales ◽  
Silver Halides ◽  
Broken Hill ◽  
South Wales ◽  
Hill District

scholarly journals Broken Hill, New South Wales

Nature ◽  
1924 ◽  
Vol 113 (2845) ◽  
pp. 697-698
Keyword(s):  
New South ◽  
New South Wales ◽  
Broken Hill ◽  
South Wales

The Granitization Process and its Limitations as Exemplified in Certain Parts of New South Wales

1952 ◽  
Vol 89 (1) ◽  
pp. 25-38 ◽  
Author(s):  
Germaine A. Joplin
Keyword(s):  
Wave Front ◽  
New South ◽  
Regional Metamorphism ◽  
New South Wales ◽  
Compressional Wave ◽  
Thermal Metamorphism ◽  
South Wales ◽  
Strong Compression

AbstractIn an attempt to dissect the granitization process in an area of regional metamorphism, it is suggested that granite is forcibly injected during strong compression, that the compressional wave passes upwards and outwards in advance of the magma, and that several changes take place before its arrival. Six stages in this process are recognized in the Cooma and Albury districts of N.S.W.: (1) Regional Metamorphism, (2) Superimposed Thermal Metamorphism, (3) Permeation without Magmatic Addition, (4) Addition from an Attenuated Magma, (5) Formation of a Potassic Wave-Front, and (6) Injection of the Magma as Concordant Intrusions. The conditions favouring granitization are discussed and the question of basic fronts is considered.

Myrmekite and muscovite developed by retrograde metamorphism at Broken Hill, New South Wales

1972 ◽  
Vol 38 (297) ◽  
pp. 570-578 ◽  
Author(s):  
Evan R. Phillips ◽  
D. M. Ransom ◽  
R. H. Vernon
Keyword(s):  
Late Stage ◽  
New South ◽  
New South Wales ◽  
Retrograde Metamorphism ◽  
Broken Hill ◽  
South Wales ◽  
Proportionality Relationship

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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