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The fact that the moons move in a circular prograde orbit, close to the asteroid's equatorial plane, also lends support to this scenario.
The apparent critical temperature between 560 to 600°C for monazite growth at Ballachulish is broadly consistent with several previous studies of monazite in prograde metamorphic sequences.
During the cooling stage the isotherms will retreat towards the host rock-container interface, leaving behind a sequence of largely prograde metamorphic zones outside the sarcophagus of melted and recrystallized granite.
Given the stability of zircon during metamorphic processes, it may be assumed that the formation of new zircons in prograde metamorphism is not significant until the appearance of melt.
Both thrust and normal faults initiated synchronously with Miocene prograde metamorphism and melting, and have moved episodically since then.
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