ANALOGUE MODELS OF MELT-FLOW NETWORKS IN FOLDING MIGMATITES
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dc.contributor.author | Barraud J. | |
dc.contributor.author | Gardien V. | |
dc.contributor.author | Allemand P. | |
dc.contributor.author | Grandjean P. | |
dc.date.accessioned | 2022-10-27T10:15:40Z | |
dc.date.available | 2022-10-27T10:15:40Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=26907452 | |
dc.identifier.citation | Journal of Structural Geology, 2004, 26, 2, 307-324 | |
dc.identifier.issn | 0191-8141 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39179 | |
dc.description.abstract | We have modelled the formation and the layer-parallel shortening of layered (stromatic) migmatites. The model consists of thin superposed layers of partially molten microcrystalline wax. The melt (30 vol.%) has a negative buoyancy and a high viscosity contrast with its solid matrix. As soon as the shortening begins, melt-filled veins with high aspect ratios open along foliation. The melt is segregated into the veins, forming a stromatic layering. During incipient folding, crescent-shaped saddle reefs open at the hinges of open sinusoidal folds. Further shortening and melt-enhanced shear displacements on interlayer interfaces cause chevron folds to develop and the saddle reefs to become triangular. In comparison, a melt-free experiment shows only a few layer-parallel openings and no saddle reefs in chevron folds. On the basis of our experimental results, we propose that in migmatites: (1) mesoscale melt migration is a combination of flow in immobile veins and movements of veins as a whole; (2) the changes in the geometry of the mesoscale melt-flow network create the pressure gradients that drive melt migration; (3) the melt-flow network does not need to be fully interconnected to allow local expulsion; (4) melt expulsion is episodic because the temporal evolution of the network combines with the spatial heterogeneity of the deformation. | |
dc.subject | Migmatites | |
dc.subject | Melt segregation | |
dc.subject | Melt migration | |
dc.subject | Compaction | |
dc.subject | Leucosomes | |
dc.subject | Folds | |
dc.subject | Paraffin wax | |
dc.title | ANALOGUE MODELS OF MELT-FLOW NETWORKS IN FOLDING MIGMATITES | |
dc.type | Статья |
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