| 低温榴辉岩中石榴子石的成分分带:快速抬升的证据 |
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| 引用本文： | 程昊,陈道公,Weiji Cheng,杨晓志.低温榴辉岩中石榴子石的成分分带:快速抬升的证据[J].地球化学,2003,32(1):81-85. |
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| 作者姓名： | 程昊 陈道公 Weiji Cheng 杨晓志 |
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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,安徽合肥,230026
2. 亚利桑那大学地球科学系,美国图森 85721 |
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| 基金项目： | 国家自然科学基金(40273028)，科学技术部基础研究项目(G1999075503) |
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| 摘 要： | 对南大别黄镇冷榴辉岩中——颗石榴子石进行了详细的电子探针工作，对其特殊的成分分带，建立了扩散模型并进行数值模拟，结果得到4．5mm／a的快速抬升速率。该结果表明黄镇榴辉岩曾经历了一个快速的抬升过程。
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| 关 键 词： | 石榴子石 榴辉岩 电子探针 数值模拟 扩散模型 大别山 |
| 文章编号： | 0379-1726(2003)01-0081-05 |
Garnet chemical zoning in low-T eclogite: Evidence for fast exhumation |
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| Weiji Cheng.Garnet chemical zoning in low-T eclogite: Evidence for fast exhumation[J].Geochimica,2003,32(1):81-85. |
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| Authors: | Weiji Cheng |
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| Abstract: | The compositions of a special garnet crystal in so-called cold Hunagzhen eclogite from Southern Dabie Mountains are determined with electron microprobe, and an intriguing garnet zoning pattern is observed. Detailed and careful step scanning across two parts of the garnet is performed, and this zoning pattern can be described as a relaxation diffusion mechanism between two composition members. Using relaxation diffusion model, with the determined p-T condition bymeans of traditional metrological methods by other authors, numerical model of the profile between the two different parts of the garnet crystal is established, and the results suggest the rocks of Huangzhen suffered an exhumation velocityabout 4.5 mm/a after the eclogite phase. This result provides important information on the tectonic mechanism for the Dabie Mountains eclogites exhumation. |
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| Keywords: | eclogite garnet diffusion numerical model Dabie Mountains |
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