摘要
对南大别黄镇冷榴辉岩中一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。
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.
出处
《地球化学》
CAS
CSCD
北大核心
2003年第1期81-85,共5页
Geochimica
基金
国家自然科学基金(40273028)
科学技术部基础研究项目(G1999075503)
