| 大别山榴辉岩中磷灰石的结构碳酸根 |
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| 引用本文： | 李一良,郑永飞.大别山榴辉岩中磷灰石的结构碳酸根[J].高校地质学报,1999,5(4):405-411. |
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| 作者姓名： | 李一良 郑永飞 |
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| 作者单位： | [1]中国科学技术大学地球和空间科学系化学地球动力学研究实验 [2]中国科学技术大学地球和空间科学系化学地球动力学 |
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| 基金项目： | 科技部攀登预选项目!( 95 预 3 9)，中国科学院项目!(KZ95 1 A1 4 0 1)，国家自然科学基金!(No .4 94 5 3 0 0 3 )资助 |
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| 摘 要： | 在大别山东南部的高压和超高压榴辉岩中发现磷灰石含有结构碳酸根。磷灰石主要以包裹体的形式存在于筛状变晶结构的石榴石中，其形成时间早于石榴石和榴辉岩的矿物组合。Ｘ射线衍射和傅立叶变换红外光谱研究表明，磷灰石中结构碳酸根替代「ＰＯ４」＾３－，表现为在１４５５－１４２２ｃｍ＾－１的吸收带，以及在１５０℃以下温度难以消除的在１６３０ｃｍ＾－１的吸附水，但常规Ｘ射线衍射和傅立叶变换红外光谱难以给出其含量。用EA－MS连线技术测量给出结构碳酸根的含量在0.95-5.24 CO2wt％。榴辉岩磷灰石中结构碳酸根的鉴定和碳含量的定量测定证明，在超高压变质过程中存在含CO2的峰变质流体。
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| 关 键 词： | 榴辉岩 磷灰石 结构碳酸根 含碳流体 大别山 |
| 收稿时间： | 1999-12-20 |
| 修稿时间： | 1999-12-20 |
STRUCTURAL CARBONATE WITHIN APATITE FROM ECLOGITES IN THE SOUTHEASTERN DABIE MOUNTAINS |
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| Li Yiliang,Zheng Yongfei.STRUCTURAL CARBONATE WITHIN APATITE FROM ECLOGITES IN THE SOUTHEASTERN DABIE MOUNTAINS[J].Geological Journal of China Universities,1999,5(4):405-411. |
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| Authors: | Li Yiliang Zheng Yongfei |
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| Institution: | Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 |
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| Abstract: | Structural carbonate is found within apatite from eclogites in the southeastern part of the Dabie Mountains. The apatite is mainly hosted in the diablastically textured garnet. Euhedral hexagonal or needle-like apatite occurs at an earlier stage of metamorphism than the garnet and the eclogitic assemblages. Apatite has a small diameter between 0.02 and 0.07mm，which is averaged 65 times smaller than the host garnet. X-ray diffraction and Faurier transform infrared spectroscopic studies show that all of the apatite has detectable amount of structural carbonate. It is identified to substitute PO4]3-, but its amount cannot be measured by the traditional spectroscopic methods. An EA-MS online measurement gives a wide range of structural carbonate content(0.95～5.24 CO2wt％). The high C content is attributed to the contribution from the other kinds of carbon, such as the fluid inclusion or the carbonaceous film in the micro-crack. As a result, the spectroscopic calibrated values are always lower than the EA-MS online ones because significant amounts of structural carbonate show no signa1. Both identification of structural carbonate within apatite from eclogites and the quantitative measurement of bulk carbon concentration in the apatite demonstrate the presence of CO2-bearing fluid during ultrahigh pressure metamorphism in the Dabie Mountains. |
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| Keywords: | eclogite apatite structural carbonate CO 2 bearing fluid Dabie Mountains |
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