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应用EA-MS连线技术,对大别山东部和苏鲁地体南部超高压变质榴辉岩及其中的磷灰石进行了碳的含量和同位素分析。结果得到,榴辉岩全岩的δ13C值变化较大(-30.7‰至+2.5‰),而所含磷灰石中结构碳酸根的δ13C值变化较小并显著亏损13C(-28.1‰至-20.8‰)。部分榴辉岩具有高的全岩δ13C值,指示其形成后受到过含CO2,流体的退化蚀变。低的磷灰石δ13C值指示,榴辉岩中含有地表有机碳,因此证明这些榴辉岩的原岩曾出露过地表,在超高压变质阶段存在以亏损13C为特征的含CO2,流体。
Using EA-MS connection technology, the carbon content and isotopic analysis of ultrahigh-pressure metamorphic eclogite and its apatite in the southern part of the Dabie Mountains and the southern Sulu terrane were studied. As a result, the δ13C value of the whole rock of eclogites varies widely (-30.7 ‰ to + 2.5 ‰), while the δ13C value of structural carbonate in the apatite shows a small change and a significant loss of 13C (-28.1 ‰ - 20.8 ‰). Some eclogites have high δ13C value of whole rock, indicating that they degenerated by CO2-containing fluids after their formation. The low δ13C value of apatite indicates that the eclogites contain surface organic carbon, which proves that the original rocks of these eclogites have been exposed to the earth’s surface. There is a CO2-containing fluid with a loss of 13C during the UHP metamorphism.