Contact metamorphism of pelitic, psammitic and calcareous sediments in the Southern Highlands of New South Wales

1988 ◽  
Vol 35 (3) ◽  
pp. 389-401 ◽  
Author(s):  
Bryan E. Chenhall ◽  
Brian G. Jones ◽  
Paul F. Carr
Keyword(s):  
New South ◽  
New South Wales ◽  
Contact Metamorphism ◽  
South Wales

Hornblendes from some basic hornfelses in the New England region, New South Wales

1965 ◽  
Vol 34 (268) ◽  
pp. 52-65 ◽  
Author(s):  
R. A. Binns
Keyword(s):  
New England ◽  
Ferrous Iron ◽  
New South ◽  
New South Wales ◽  
Progressive Increase ◽  
Contact Metamorphism ◽  
South Wales ◽  
Bluish Green ◽  
Very High

SummaryWith progressive increase in grade of contact metamorphism, aluminous hornblendes in some New England basic hornfelses change from a pale blue-green variety with ragged actinolitic habit, to a deeper bluish-green variety, then to a deeply coloured brownish type with granular habit. At all stages the coexisting plagioclase is appreciably calcic. No outer aureole of albite-epidote-actinolite hornfels has been recognized. The higher grade hornblendes are richer in alkalis and titanium, and poorer in octahedrally co-ordinated aluminium than those formed at low grades. Two analysed hornblendes display an unusual excess of calcium, which occupies the Y site, and another has a very high content of ferrous iron and potassium.

The Exogenous Contact-zone at Ben Bullen, New South Wales

1935 ◽  
Vol 72 (9) ◽  
pp. 385-400 ◽  
Author(s):  
Germaine A. Joplin
Keyword(s):  
Contact Zone ◽  
New South ◽  
New South Wales ◽  
Contact Metamorphism ◽  
Normal Contact ◽  
South Wales ◽  
Plutonic Complex

Recently an account of the endogenous contact-zone of the non-magnesian limestones at Ben Bullen was published in this Magazine (Joplin, 1935 a), and it is now proposed to examine the effects of normal contact metamorphism in the aureole of the Ben Bullen plutonic complex.

The Contact Metamorphism and Related Phenomena in the Neighbourhood of Marulan, New South Wales

1931 ◽  
Vol 68 (7) ◽  
pp. 289-314 ◽  
Author(s):  
G. D. Osborne
Keyword(s):  
Iron Oxides ◽  
New South ◽  
New South Wales ◽  
Contact Metamorphism ◽  
Minor Amount ◽  
Thermal Change ◽  
South Wales ◽  
Quartz Monzonite ◽  
Metasomatic Replacement

1. The contact metamorphic effects produced by the intrusion of quartz-monzonite into the Silurian limestone of the Marulan district, New South Wales, are described.2. The rocks are divided broadly into marbles, hornfelses, skarns, and hybrid diopside-rocks. The first two groups are interpreted as being due to the recrystallization of limestone containing impurities which have reacted with the lime of the sediments to give lime-silicates and certain other minerals. The view is taken that only a very minor amount of pneumatolytic metamorphism followed the main thermal change. The skarns are shown to be due to the metasomatic replacement of recrystallized limestone by magmatic solutions rich in iron and silica, which were also responsible for the deposition of iron-oxides in cracks.The hybrid rocks are explained as developing from limited marginal assimilation of limestone by the quartz-monzonite magma.

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