摘要
本文测定了江苏东海科学超深钻选址地区地表和钻孔片麻岩样品的锆石和磷灰石的裂变径迹年龄。地表样品 97CK0 1的锆石裂变径迹年龄为 134± 11Ma ,磷灰石的裂变径迹年龄为 6 6 .8± 2 .5Ma。ZK2 30 4 85号样品磷灰石的裂变径迹年龄为 79.2± 2 .5Ma。由估计的锆石和磷灰石的裂变径迹封闭温度得到该地区从约2 2 5℃冷却到 10 0℃时的冷却速率为 (1.9± 0 .2 )℃ Ma ,在从约 10 0℃冷却到现在的冷却速率为 (1.0± 0 .1)℃ Ma。我们得到的结果不支持前人关于新生代加速冷却的结论 ,可能与地区的差异冷却有关。
Fission track ages of zircon and apatite are measured for the gneisses from Donghai, Jiangsu province. The fission track age of the zircon from a surface sample 97CK01 is 134±11 Ma, and that of the apatite is 66.8±2.5 Ma. The fission track age of the apatite from a drill core sample ZK2304-85 is 134±11Ma. Based on data a cooling rate (1.5±0.2)℃/Ma was obtained. Our result is smaller than that of the previous work, which suggests different cooling history for different regions of the Dabie-Sulu Orogenic Belt.
出处
《矿物岩石地球化学通报》
CAS
CSCD
2001年第4期306-308,共3页
Bulletin of Mineralogy, Petrology and Geochemistry
