Abstract
Olivine phenocrysts in the picritic scoria that erupted from Kilauea Iki in 1959 occur as glomeroporphyritic aggregates of 2–16 crystals. The compositions and three-dimensional textures of the olivines vary within an aggregate and within individual lapilli. The attachment of crystals from different environments indicates that these aggregates formed by synneusis — the swimming together of crystals. Most of the crystals are attached along faces with their a crystallographic axes parallel and their c axes either parallel or perpendicular, so that the structural mismatch and interfacial energy are minimized. Observed facial attachments are consistent with fluid dynamical interactions of crystals falling with their large {010} faces horizontal. The aggregates formed in a liquid-rich magma. Rough computations suggest that the minimum aggregation time could be on the order of minutes. Aggregation of very small crystals suggests that the yield strength was less than 3 dynes cm−2. The textures of the aggregates are similar to those of cumulate peridotites.
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Schwindinger, K.R., Anderson, A.T. Synneusis of Kilauea Iki olivines. Contr. Mineral. and Petrol. 103, 187–198 (1989). https://doi.org/10.1007/BF00378504
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DOI: https://doi.org/10.1007/BF00378504