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زمینشناسی و معدن::
دگرگونی، دگرگونه
In fact, metamorphic and intrusive magmatic rocks at the surface in the Andes can be used to estimate the amount of uplift and subsequent amount of erosion.
With continuing deformation penetrative narrow cleavage planes develop ("slaty cleavage") and with increasing pressure and tem- perature, metamorphism begins.
As opposed to subducted ophiolites from the lower plate, they do not experience high-pressure metamorphism un- less they are scraped off and dragged down.
High-pressure or subduction metamorphism
Rocks in subduction zones are metamorphosed under conditions of high pressure at relatively low temperature, hence the terms high-pressure (prop- erly high-pressure/low-temperature) metamor- phism or subduction metamorphism; Fig. 7.24).،preservation and commonly affected by superimposed geological processes such as metamorphism and deformation, making it
metamorphic remnants known to date, as well as large exposures of Paleoarchean to late Neoproterozoic rock records (Fig. 2).
the right side depicts the Secondary Ion Mass Spectrometry (SIMS) ages obtained from pits in both the magmatic core and metamorphic rim (left image).
hollow rectangles indicate the respective metamorphic episodes.
were derived from tonalite to granite protoliths and are part of a polydeformed and high grade metamorphic complex including
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