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Aspects of the mineralogy of alnöitic breccia, Malaita, Solomon Islands; comparison with continental kimberlites (1978)

Dawson, J. B. ; Delaney, J. S. ; SmitH, J. V.

Springer

Contributions to mineralogy and petrology 67 (1978), S. 189-193

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Megacrysts of titanian pyrope, high-Ti bronzite, sub-calcic diopside to augite, and phlogopite in an alnöitic breccia, Malaita, Solomon Islands, have compositional features which distinguish them from silicates in kimberlites. Particularly important is the high content of Al2O3 in the Malaita silicates, which may reflect the higher Al2O3 content of alnöite than kimberlite. The phlogopite megacrysts fall into two populations, one richer in Mg and Cr, and lower in Ti, than the other. The pyroxenes may also fall into two groups characterized by high and low Mg, Cr and Ni. Two stages of crystallization may be responsible.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01046575

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