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- W2041620009 abstract "The occurrence of micron to millimeter size globular heterogeneities in igneous rocks is frequently explained by processes of liquid immiscibility. However, such textures have also been documented in miscible magmatic pairs. In this study, the ability of miscible magmas to develop transient surface tensions and mimic the behavior of immiscible liquids is tested for the whole spectrum of magmatic compositions. We implemented a numerical model that includes the effect of gradient stresses (namely Korteweg stress) in order to investigate the role of such stresses in the evolution of diffusive interfaces. The results show that an initially elongated heterogeneity surrounded by a miscible and compositionally diverse magma will tend to minimize its contact surface by relaxing to a spherical shape, advected by a Korteweg stress driven flow. If the initial aspect ratio of the heterogeneity exceeds a critical value, surface minimization may be achieved by drop breakup. In addition, it is shown that two neighboring heterogeneities may coalesce to a single spherical drop. These results imply that even for fully miscible magmas, rheological barriers may prevent efficient mechanical intermingling and induce the formation of small-scale globular textures, analogous to those commonly observed in immiscible liquids. A better understanding of the role of Korteweg stress may be of the utmost importance for deciphering the textures generated by the interaction of compositionally diverse magmas." @default.
- W2041620009 created "2016-06-24" @default.
- W2041620009 creator A5013425038 @default.
- W2041620009 creator A5060622052 @default.
- W2041620009 date "2009-01-01" @default.
- W2041620009 modified "2023-10-17" @default.
- W2041620009 title "Numerical modeling of the development of small-scale magmatic emulsions by Korteweg stress driven flow" @default.
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- W2041620009 doi "https://doi.org/10.1016/j.jvolgeores.2008.10.004" @default.
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