Metamorphosed altered komatiites at Mount Martin, Western Australia — Archaean weathering products metamorphosed at the aluminosilicate triple point

Purvis, Alan

doi:10.1080/08120098408729282

Cited by 9 publications

(1 citation statement)

References 33 publications

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“…Any such relationship in the Menzies area is far from obvious. The fuchsite-andalusite bearing rocks at Menzies show many similarities to a suite of aluminium silicate polymorph-bearing rocks at Mount Martin, near Kalgoorlie, Western Australia, described by Purvis (1984). Purvis interpreted them as metamorphosed, weathered komatiites, but did not clearly state the relationship between the nickel, iron and arsenic sulphides of the rock suite, and his proposed Archaean weathering cycle.…”

Section: Comparison With Other Areasmentioning

confidence: 99%

Corrigendum: Geological setting and origin of fuchsite‐bearing rocks near Menzies, Western Australia

Martyn¹,

Johnson

1986

Australian Journal of Earth Sciences

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Quartz-andalusite-fuchsite rocks in an Archaean greenstone belt at Menzies, Western Australia, are described in their geological setting. They are shown to have developed from intense metasomatism of layered rocks of komatiitic composition. Ratios of the immobile components Al 2 O 3 , TiO 2 , Cr, V and Zr are consistent, despite wide variations in their absolute values, and compare closely with those of an underlying komatiite suite. Marked depletion of Ca, Na, Mg and Fe has led to a strongly peraluminous composition and enhanced Cr values. Silicification and introduction of K has also occurred. Most of the metasomatism took place before peak metamorphism, and the mineral assemblage is now dominated by andalusite, fuchsite, and recrystallized quartz. Schlieren or vein-like segregations rich in andalusite, chromite, rutile and minor sulphides and tourmaline are interpreted as the original fluid pathways, where concentration of immobiles was achieved through solution of mobile components, and volume loss. They have been termed residual veins. Metasomatism is believed to have taken place by synvolcanic processes analogous to those operating in modern hot spring systems. The rocks were severely modified by metamorphism and tectonism. The fuchsitic rocks at Menzies are compared to similar rocks in other areas.

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Section: Comparison With Other Areasmentioning

confidence: 99%