地震地质 ›› 1997, Vol. 19 ›› Issue (1): 87-90.

• 科研简报 • 上一篇    下一篇

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

万京林, 李齐, 陈文寄   

  1. 国家地震局地质研究所, 北京, 100029
  • 收稿日期:1996-09-30 修回日期:1997-02-28 出版日期:1997-03-05 发布日期:2009-11-25
  • 基金资助:
    国家自然科学基金(4957214)

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

Wan Jinglin, Li Qi, Chen Wenji   

  1. Institute of Geology, SSB, Beijing 100029
  • Received:1996-09-30 Revised:1997-02-28 Online:1997-03-05 Published:2009-11-25

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)。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。

关键词: 裂变径迹, 红河断裂带, 左旋断层

Abstract: 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.

Key words: Fission track, Honghe fault zone, Left-lateral slip