There are mainly felsic granulites in Tongbai area located at southern fringe of the North China plates. A study of the mineral chemistry and the features of the mineral paragenesis and the calculation with thermobarometers revealed that the granulites in Tongbai area were formed under thep-tconditions of 700~840℃and 0.61~0.85 GPa, belonging to typical medium-pressure type, and the geothermal gradient is approximately from 28 to 31℃/km. The granulite facies metamorphism probably occurred at the late stage of Early Palaeozoic.
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张翠光,魏春景,张阿利,2002,河南桐柏麻粒岩相变质作用的p—t条件[J].岩石矿物学杂志,21(3):242~250. ZHANG Cui_guang, WEI Chun_jing, ZHANG A_li,2002,The p-t conditions of granulite_facies metamorphism in Tongbai area, Henan Province[J]. Acta Petrologica et Mineralogica,21(3):242~250.