摘要
对北大别黄土岭麻粒岩中石榴子石进行了详细的电子探针工作,并根据一颗石榴子石的成分环带,建立了扩散模型并进行了数值模拟,结合最优化的方法,得到了极其缓慢的冷却速率0.1℃/a。从扩散动力学数值模拟的角度对大别山造山带的冷却速率进行了探索性研究。该结果表明,黄土岭麻粒岩在受麻粒岩相改造后经历的是一个极其缓慢、持续时间很长的冷却过程。
Compositions of a large number of garnet crystals in the Huangtuling granulite from the northern Dabie Mountains are determined with electron microprobe, and garnet zoning is observed. Detailed and careful step scanning across a couple of selected garnet biotite is performed. With our developed diffusion model, the profile is numerically modeled. The result suggests the rocks of the Huangtuling granulite suffered a very slow cooling about 0.1 ℃ /a after the granulite phase. A cooling rate from garnet zoning in the Dabie Mountains is derived.<P>
出处
《地球化学》
CAS
CSCD
北大核心
2003年第2期167-172,共6页
Geochimica
基金
国家自然科学基金(40273028)
