安徽绩溪伏岭岩体隆升时代的磷灰石裂变径迹证据
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

本文为中国地质大学地质过程与矿产资源国家重点实验室开放课题(GPMR 200643)资助成果。


Exhumation History of the Fuling Granite, Southern Anhui: New Insights from Apatite Fission Track Analysis
Author:
Affiliation:

Fund Project:

单位:
  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    安徽绩溪伏岭岩体位于安徽省南部、黄山花岗岩体的东部。伏岭岩体裂变径迹(AFT)热年代分布于51±5~68±7 Ma之间,围限径迹长度为11.9~12.9μm。岩体形成之后,所在山系经历了速率波动较大的隆升过程,至55 Ma期间为一加速隆升过程,到55 Ma时速度达到最大的73 mm/ka;随后速度减缓,54 Ma左右时的平均抬升速率为60 mm/ka;54~51 Ma间又是一个快速加速隆升时期,到51 Ma时,速度达到70 mm/ka。研究区具有三个主要的冷却剥露阶段:130~116 Ma左右,冷却速率约为1.34℃/Ma;70~60 Ma左右,进入第二个较为快速冷却阶段,冷却速率约为25℃/Ma;在7~8 Ma左右发生突然加剧冷却事件,持续至今,速率达到8℃/km。总体来说,伏岭岩体经历了速率逐渐增加的冷却过程。由于黄山山体与伏岭岩体在大地构造位置、岩性特征及侵入时间上具有很大的相似性,二者的隆升时代、速率以及抬升剥蚀量是大致相当的。

    Abstract:

    The Fuling granite is located in the southern part of Anhui province and to the east of Huangshan Mountain. Apatite fission track (AFT) study of the Fuling granite shows ages ranging from 51 5 Ma to 68 7 Ma. The results show that the granite rose at a variable rate since formation. The uplift of the pluton gradually accelerated up to 55 Ma, with a rate of 73 mm/ka at 55 Ma. Since then the uplift rate slowed down to an average of 60 mm/ka at 54 Ma. During 54 Ma to 51 Ma, the uplift of the granite speeded up again and reached a value of 70 mm/ka at 51 Ma. Simulation of the uplift history based on fission track lengths of 11.9~12.9 μm reveals three major denudation periods of the Fuling granite. The first stage began from about 130~116 Ma, with a cooling rate of about 1.34 ℃/Ma. Since 70~60 Ma, the cooling rate reached 2.5 ℃/Ma, slightly faster than the first cooling stage. In the last stage from 7~8 Ma to present, an intensive cooling event happened and the cooling rate reached 8 ℃/Ma. Overall the Fuling granite has experienced an accelerated cooling process. As Huangshan granite is similar in geotectonic location, lithology and intrusive period as Fuling granite, writers therefore infer that Huangshan granite may have a similar thermal history as Fuling granite.

    参考文献
    相似文献
    引证文献
引用本文

郑勇,余心起,王德恩,汪诚.2009.安徽绩溪伏岭岩体隆升时代的磷灰石裂变径迹证据[J].地质论评,55(3):385-394,[DOI].
.2009. Exhumation History of the Fuling Granite, Southern Anhui: New Insights from Apatite Fission Track Analysis[J]. Geological Review,55(3):385-394.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2008-05-17
  • 最后修改日期:2008-10-17
  • 录用日期:
  • 在线发布日期:
  • 出版日期: