The emplaced depth of the granite from Jintan pluton:Constraints from mineral chemistry of muscovite
Muscovite is a common mineral in peraluminous granites,it could be a mineral barometer to constrain the emplacement depth of peraluminous granites.Chemical compositions of muscovite from the Jintan two-mica granite are determined using electron microprobe.According to the calculation for the crystallization pressure of the muscovite,the pressure of emplacement of the Jintan pluton is 4.9×108～6.1×108 Pa with average 5.4×108 Pa,corresponding to 16～20 km with average 18 km in depth.Combing with previous studies,we suggest that the em-place depth is 17～19 km,and we can presume that crustal thickness of South China in the Indosinian period was likely ≥50 km,but it may be denudated because of extensive weathering in the Yanshanian period,which can be a new explanation for the lacking Indosinian volcanic rocks in South China.
South ChinagraniteJintan plutonmuscoviteemplace depth
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