摘要
对采自红河断裂带元阳—嘎洒段的４个片麻岩和糜棱岩样品中的磷灰石进行裂变径迹（ＦＴ）测年，得到５．６１～１０．６４Ｍａ的年龄范围。结果表明，ＲＲＦＺ段磷灰石ＦＴ年龄有从东南向西北变新的趋势。结合已有的钾长石多重扩散域（ＭＤＤ）模式结果，得到该段１５０℃至１１０℃温度范围的冷却过程（冷却速度为３．４～９．４５℃／Ｍａ）。
Fission track analyses were performed for 4 apatites. They were collected from gneiss and mylonite of Red River fault between the Yuan Yang and Gasa. The FT ages at this area were 5.61～10.64Ma. We had found that the age of FT also had a tending becoming younger from SE to NW. Using FT age combined with results of multiple diffusion domain (MDD) model of K feldspars a slow cooling process among 150～110℃ and cooling velocity of 3.4～9.5℃/Ma are obtained. The characteristic shown by results of FT is consistent with the conclusion that the faults were transtensional prior to 15.5Ma and became transpressional later.
出处
《地震地质》
EI
CSCD
北大核心
1997年第1期87-90,共4页
Seismology and Geology
基金
国家自然科学基金
