黄镇低温榴辉岩中石榴石成分分带的扩散动力学研究

doi:10.11867/j.issn.1001-8166.2005.04.0421

地球科学进展 ›› 2005, Vol. 20 ›› Issue (4): 421 -426. doi: 10.11867/j.issn.1001-8166.2005.04.0421

程昊 ^1,2，陈道公 ¹，周祖翼 ²

1.中国科学技术大学地球和空间科学学院，安徽合肥 230026；2.同济大学海洋地质教育部重点实验室，上海 200092

收稿日期:2003-09-27 修回日期:2004-08-20 出版日期:2005-04-25
通讯作者: 程昊
基金资助:
中国博士后科学基金项目“大别山石榴石成分环带的扩散动力学研究”；国家自然科学基金项目“大别山冷却史:地质年代学和扩散动力学研究”（编号：40273028）资助.

MODELING OF HUANGZHEN LOW-T ECLOGITE WITH DIFFUSION KINETICS THEORY

CHENG Hao ^1,2;CHEN Daogong ¹;ZHOU Zuyi ²

1.Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,China;2.Key Laboratory of Marine Geology, Ministry of Education, Tongji University, Shanghai 200092,China

Received:2003-09-27 Revised:2004-08-20 Online:2005-04-25 Published:2005-04-25

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对南大别黄镇低温榴辉岩中不同粒径的石榴石颗粒所具有的不同化学成分分带进行研究，通过建立相应的扩散调整模型，运用扩散动力学的方法进行了模拟计算。结果表明该榴辉岩中石榴石经过峰期榴辉岩相变质之后，其成分环带经约23 Ma的扩散调整形成现在的组分特征。黄镇榴辉岩在峰期变质之后曾经历的是一个约6℃/Ma冷却过程，该过程持续了约23 Ma。黄镇榴辉岩不大可能与南大别超高压榴辉岩一样受到过超高压变质作用。

关键词: 低温榴辉岩, 石榴石, 扩散, 数值模拟

We determined the compositions of various sizes of garnets in so-called cold Huangzhen eclogites from Southern Dabie with electron microprobe, and observed that it shows intriguing zoning patterns. We find these zoning patterns can be interpreted by a relaxation diffusion mechanism. Using relaxation diffusion model, with the determined PT condition by means of traditional petrologic methods by others and numerically model of the profile’s adjusting, the result suggests the adjustment of the smallest garnet in this study cost 23Ma until the process ceased. This means that the rocks of Huangzhen suffered an exhumation velocity about 6℃/Ma after the peak metamorphism. This result supports the idea that the Huangzhen eclogites did not experienced UHPM, and also provides important information on the tectonic mechanism for the mountain Dabie eclogites exhumation.

Key words: Garnet, Diffusion, Numerical model, Cold eclogite

中图分类号:

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