原子能科学技术Issue(8)：1458-1467,10.DOI:10.7538/yzk.2013.47.08.1458
从裂变径迹分析新疆阿尔泰南部地区构造活动与古地形的变化
Apatite Fission Track Analysis on Tectonic Activities and Paleotopography in Southern Altai Region,Xinjiang,China
摘要
Abstract
This work engages apatite fission track evidences on thermotectonic history , rock uplift rate ,denudation extent in southeastern Altai region .Fission track ages of 14 samples range from (59.4 ± 5.8) Ma to (109.7 ± 8.1) Ma and the length is between (12.0 ± 2.5)μm and (13.7 ± 1.5)μm .Thermal modeling reveals that the samples have a three-stage of uplift-cooling history .The first stage is in an overall initial uplift before 108 Ma ,the second stage from 108 Ma to 28 Ma experiences a slow cooling phase ,and the last stage through a rapid-cooling process since 28 Ma with a cooling rate 1.25-1.61 ℃ /Ma and denudation amount 1.17-1.50 km ,the fast exhumation period in the area .The sample ages could be divided into 4 age groups ,reflecting multiple tectonic events with different uplift rates .The paleotopography altitude changes from 3 895 m to 821 m ,2 250 m to 762 m etc .,and the amplitude of changes reaches to 3 300-1 400 m since 90 Ma .The phenomenon of Alpine turning to valley and valley uplifting is visible in the studied area ,indicating various stages of paleotopography .Based on inversion of ancient landform and equilibrium correction , the equilibrium rebound would play an important role in the rock uplift during the Altai post-orogenic period.关键词
构造事件/隆升/古地形/磷灰石裂变径迹/阿尔泰Key words
tectonic events/uplift/paleotopography/apatite fission track/Altai分类
天文与地球科学引用本文复制引用
赵文菊,袁万明,刘海涛,宋高..从裂变径迹分析新疆阿尔泰南部地区构造活动与古地形的变化[J].原子能科学技术,2013,(8):1458-1467,10.基金项目
国家自然科学基金资助项目（40872141，40872068，41172088）；973计划资助项目 （）
