【摘要】 沐尘岩体出露于江山—绍兴断裂带内,与溪口大型黄铁矿床成因关系密切,其矿物学特征和成岩物理化学条件等倍受关注。通过沐尘岩体矿物学的研究,结合有关资料,估算出沐尘岩体岩浆开始结晶温度为775~850℃,黑云母形成时氧逸度为10-7~10-8Pa,水逸度2.47×108Pa,结晶压力约0.64×108Pa,大致相当于2~3km的侵位深度,属浅带侵入岩体。更多还原

【Abstract】 The Muchen intrusive body occurs within the well-known Jiangshan-Shaoxing fault,and has a close genetic connection with a large-scale pyrite deposit in Xikou.Geologists have been paying attention to the mineral characteristics and physical and chemical conditions of formation of the intrusive body.Based on the mineral characteristics of the Muchen intrusive body,in combination with some experimental results,the petrogenetic conditions were proposed.（1） The initial crystallization temperature of the magma was 775-850 ℃,（2） the oxygen fugacity was 10^-7-10^-8 Pa during the formation of biotite,（3） the water fugacity was 2.47×10⁸ Pa,and（4） the crystallization pressure was approximately(0.64×10⁸) Pa,corresponding to an emplacement depth of ca.2-3km.The Muchen intrusive body is a hypabyssal intrusive body.更多还原