哀牢山-红河左旋走滑剪切带构造抬升时间序列的裂变径迹证据

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）。ＦＴ结果反映的特征与南海盆地得到的１５Ｍａ时断裂带所受力的转换的结果是一致的

FISSION TRACK EVIDENCE OF DIACHRONIC UPLIFT ALONG THE AILAO SHAN RED RIVER LEFT LATERAL STRIKE SLIP SHEAR ZONE

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