In general, there is an increase in metamorphic grade from trench to arc where highest grade ( blueschist to eclogite ) is structurally uplifted ( in the prisms ) compared to the younger deposits ( basins ).
22.
Ultramafic rocks in purely hydrous, CO 2-free environments will tend to form serpentinite-antigorite-brucite-tremolite assemblages ( dependent on MgO content ) or at amphibolite to granulite metamorphic grade, metamorphic pyroxene or olivine.
23.
In the Barrovian sequence ( described by George Barrow in zones of progressive metamorphism in Scotland ), metamorphic grades are also classified by mineral assemblage based on the appearance of key minerals in rocks of pelitic ( shaly, aluminous ) origin:
24.
Efforts to depict initial lithologies and tectonic formation of the Isua Belt have been difficult due to the immense episodes of regional metamorphism the area has experienced, which is why most efforts have been focused on the northern complex, called the Isukasia Terrane, where the area exhibits a lower metamorphic grade.
25.
It extends for nearly 2500 km along strike and has been the site of at least 140 and perhaps more than 600 km of displacement (; ) . defined the MCT in Kumaon based on the difference in metamorphic grade between low to medium-grade rocks of the Lesser Himalaya and higher-grade rocks of the Greater Himalaya.
26.
For long, many researchers have defined the Main Central Thrust by different criteria, including by lithology that differs between the hanging wall and the footwall, by metamorphic grade changes from the hanging wall to the footwall, by the different Uranium-Lead ( U-Pb ) detrital zircon ages, by the different Neodymium isotope compositions, by different strain, etc . Some of these criteria have also been combined.
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