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本文介绍了堇青石-石榴子石地质温度-压力计的原理和方法,并应用于探讨大容山S-型花岗岩的形成条件。选择四组不同成因类型的堇青石、石榴子石共生组合,用电子探针分析结果计算其形成的T、P条件:其中三组岩体和包体样品T为820°-875℃;P为3.99-4.44kb,结合岩石学特征估算了大容山S型花岗岩的形成条件,推测其源岩为相当于麻粒岩相的变质泥岩。
This paper introduces the principle and method of cordierite-garnet geothermometer-pressure gauge, and discusses the formation conditions of Dayangshan S-type granite. Four groups of cordierite and garnet assemblages with different genetic types were selected and their T and P conditions were calculated by electron microprobe analysis. Among them, T and T of three groups of rocks and inclusions were 820 ° -875 ° C; P was 3.99-4.44kb. Based on the petrological characteristics, the formation conditions of the S-type granite in Dayongshan are estimated. It is presumed that the source rocks are metamorphic mudstone corresponding to granulite facies.