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荣城3类经历过超高压变质的榴辉岩具有明显不同的氧同位素组成.产于区域片麻岩和超镁铁岩中的榴辉岩具有通常榴辉岩的氧同位素组成,而产于大理岩中的榴辉岩特别富集18O.各类榴辉岩的石英-石榴石氧同位素温度大体指示榴辉岩的形成温度,由此估计榴辉岩的峰期变质温度平均略高于800℃,与其他地质温度计估计的温度基本一致.荣城杨官屯大理岩中榴辉岩包体的δ18O值远比大别山和苏鲁地体其他地区的榴辉岩(包括大理岩中的榴辉岩包体)都高.矿物的氧同位素分析结果表明荣城的榴辉岩形成温度总体上高于大别山和苏鲁西南部地区,而不同矿物对估计的同位素温度数据分散反映该地区超高压榴辉岩抬升期间普遍遭受过叠加变质作用.
The eclogites that experienced UHP metamorphism in Rongcheng have significantly different oxygen isotopic compositions.3 The eclogite produced in the regional gneisses and ultramafic rocks has the oxygen isotopic composition of usually eclogites and is derived from Eclogites in marble are particularly enriched in 18O. The quartz-garnet oxygen isotope temperature of various eclogites generally indicates the formation temperature of eclogites, and the peak metamorphic temperature of eclogites is estimated to be slightly above 800 ℃, which is consistent with the estimated temperatures of other geological thermometers.The δ18O values of the eclogite inclusions in the Yangguantun marble of Rongcheng are far more than the eclogites in the Dabie Mountains and other parts of the Sulu basement (including the eclogite packs in the marble Oxygen isotopic analysis of minerals shows that the temperature of eclogite formation in Rongcheng is generally higher than that in Dabie Mountains and southwestern Sulu and the distribution of estimated isotope temperature data by different minerals reflects that the UHP eclogites During the uplift generally suffered superposition metamorphism.