Baja Folds Interpreted

Note how the folds have a great variety of shapes, with layers that are fairly discontinuous so that it is hard to trace an individual folded layer for very long. Some appear to form closed loops. Two descriptors that are used for a fold geometry like this are irregular and/or chaotic. Note also the truncation zones of some of the gneissic layering - these could be considered as small ductile shear zones. These are curved, and appear discontinuous although most likely they bend into and continue along the gneissic layer where offset is no longer discernable. This deformation style is typical of migmatites, and at the time of deformation the assemblage may well have been 50% or more melt, and therefore very weak and easily deformed.

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