【摘要】 利用Wones等（1965;1972）提出的黑云母成分和fH₂O、fO₂方程式对福州和鼓山花岗岩体的成岩温度和压力反复进行估算,发现其结果与地质现象不符。因此才考虑对其方程的Δμ°/2.303RT的数值重新进行热力学推导并应用于上述两岩体的估算,计算结果与地质现象较为吻合。更多还原

【Abstract】 A new biotite composition-fH₂O equation has been re-deducted from that suggested by Wones et al.（1972）. Using the new equation and twofeldspar geothermometer and based on the interception of P-T curve of biotite resolution with liquidus and solidus in the granitic system, crystallization temperatures and pressures of two granitic intrusions, Fuzhou granite and Gushan granite, have been estimated. Crystallization of Fuzhou granite began at T=880℃, PH₂O=800×10⁵Pa and ended at T=795℃, PH₂O=410×10⁵Pa. The initial temperature and pressure of crystallization of Gushan granite are 855℃ and 900×10⁵Pa and final T and PH₂O are 780℃ and 500×10⁵Pa respectively. These estimations are consistent with the geological characteristics of the two intrusions.更多还原