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Nodular chromite is a characteristic feature of ophiolitic podiform chromitite and there has been much debate about how it forms. Nodular chromite from the Troodos ophiolite in Cyprus is unusual in that it contains skeletal crystals enclosed within the centres of the nodules and interstitial to them. 3D imaging and electron backscatter diffraction have shown that the skeletal crystals within the nodules...
The 2.9 Ga-old Forrestania greenstone belt is intermediate in character between typical > 3.0 Ga and 2.7 Ga belts in containing both Al-depleted and Al-undepleted komatiites. The extensive nickel exploration database on the belt provides a unique opportunity to examine geochemical variations in the context of volcanological evolution. Within each of the six komatiitic units in the greenstone...
The Archaean supracrustal sequence at Forrestania contains at least five komatiitic belts which can be traced along strike for distances in excess of 30 km. Lithologies range from olivine cumulates, which crystallised at the interface between substrate and flowing lava, to spinifex-textured rocks, which underwent rapid crystallisation within ponded lava lobes. Characteristic associations of different...
The Perseverance (formerly known as Agnew) and the neighbouring Rocky's Reward nickel deposits are associated with metamorphosed komatiite flows erupted onto a substrate of felsic crystal tuffs. The deposits are overlain by the Perseverance Ultramafic Complex, which consists of a central dunite lens, 700 m thick by 3 km wide, flanked by olivine orthocumulates and spinifex textured komatiites. A...
The Perseverance (formerly known as Agnew) and the neighbouring Rocky's Reward nickel deposits are associated with metamorphosed komatiite flows erupted onto a substrate of felsic crystal tuffs. The deposits are overlain by the Perseverance Ultramafic Complex, which consists of a central dunite lens, 700 m thick by 3 km wide, flanked by olivine orthocumulates and spinifex textured komatiites. A suite...
The Archaean supracrustal sequence at Forrestania contains at least five komatiitic belts which can be traced along strike for distances in excess of 30 km. Lithologies range from olivine cumulates, which crystallised at the interface between substrate and flowing lava, to spinifex-textured rocks, which underwent rapid crystallisation within ponded lava lobes. Characteristic associations of different...
Komatiites in the western part of the Norseman-Wiluna greenstone belt in the Yilgarn Block of Western Australia display a wide variety of volcanic facies, ranging from very thin differentiated Munro Township-type flow units through to very thick olivine-rich cumulate flow units containing high proportions of adcumulate dunite.Cumulate flow units have been mapped in detail in the Agnew-Wiluna segment...
Komatiites in the western part of the Norseman-Wiluna greenstone belt in the Yilgarn Block of Western Australia display a wide variety of volcanic facies, ranging from very thin differentiated Munro Township-type flow units through to very thick olivine-rich cumulate flow units containing high proportions of adcumulate dunite.Cumulate flow units have been mapped in detail in the Agnew-Wiluna segment...
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