大兴安岭北段中新生代隆升与剥露历史的磷灰石裂变径迹证据
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摘要
对采自大兴安岭北段漠河盆地及盆地西南缘10个中酸性侵入岩样品进行了磷灰石裂变径迹年代学测试。测试结果显示,样品的径迹年龄介于72±7~99±5Ma之间,平均径迹长度介于12.5±1.5~13.7±1.8μm之间。利用热史模拟软件AFTSovle对样品进行热史模拟,结果表明,大兴安岭北段中新生代主要经历了2个重要的构造运动阶段,分别为白垩纪(120~90Ma)快速隆升剥蚀阶段及古新世(约60Ma)以来快速隆升剥蚀阶段。由此推测,这2个构造运动事件的形成分别主要受中生代末古太平洋俯冲及新生代太平洋俯冲的影响。
Ten intermediate-acidic intrusive rock samples collected from the southwestern margin of the Mohe County basin in northern Da Hinggan Mountains were used to determine the apatite fission track ages. Fission-track ages for these samples range from 72±7Ma to 99±5Ma with mean track lengths varying from 12.5±1.5μm to 13.7±1.8μm. The authors used thermal history simulation software AFTSolve to simulate the thermal history of the samples and the results show two important stages of tectonic movement of northern Da Hinggan Mountains since Late Mesozoic. They are the rapid uplift and denudation stage during the Cretaceous period(120~90Ma)and the rapid uplift and denudation stage since the Paleocene(Ca.60Ma). It is inferred that the formation of these two tectonic movements were influenced by the subduction of the paleo-Pacific Ocean and the subduction of the Pacific Ocean.
Ten intermediate-acidic intrusive rock samples collected from the southwestern margin of the Mohe County basin in northern Da Hinggan Mountains were used to determine the apatite fission track ages. Fission-track ages for these samples range from 72±7Ma to 99±5Ma with mean track lengths varying from 12.5±1.5μm to 13.7±1.8μm. The authors used thermal history simulation software AFTSolve to simulate the thermal history of the samples and the results show two important stages of tectonic movement of northern Da Hinggan Mountains since Late Mesozoic. They are the rapid uplift and denudation stage during the Cretaceous period(120~90Ma)and the rapid uplift and denudation stage since the Paleocene(Ca.60Ma). It is inferred that the formation of these two tectonic movements were influenced by the subduction of the paleo-Pacific Ocean and the subduction of the Pacific Ocean.
引文
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[16]朱文斌,张志勇,舒良树,等.塔里木北缘前寒武基底隆升剥露史:来自磷灰石裂变径迹的证据[J].岩石学报,2007,23(7):1671-1682.
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[2]Meng Q R.What drove late Mesozoic extension of the northern China-Mongolia tract?[J].Tectonophysics,2003,369(3/4):155-174.
[3]邵济安,唐克东.中国东北地体与东北亚大陆边缘演化[M].北京:地震出版社,1995:1-185.
[4]赵国龙,杨桂林,傅嘉友,等.大兴安岭中南部中生代火山岩[M].北京:北京科学技术出版社,1989:1-260.
[5]陈义贤,陈文寄.辽西及邻区中生代火山岩[M].北京:地震出版社,1997:1-279.
[6]李锦轶,莫申国,和政军,等.大兴安岭北段地壳左行走滑运动的时代及其对中国东北及邻区中生代以来地壳构造演化重建的制约[J].地学前缘,2004,11(3):157-168.
[7]陈文寄,计凤桔,王非.年轻地质体系的年代测定新方法、新进展[M].北京:地震出版社,1999.
[8]王岸,王国灿,谢德凡,等.东昆仑山小南川岩体裂变径迹年代与中新世晚期以来的构造地貌演化[J].地球科学(中国地质大学学报),2007,1:51-58.
[9]李锦轶,和政军,莫申国,等.大兴安岭北部绣峰组下部砾岩的形成时代及其大地构造意义[J].地质通报,2004,23(2):120-129.
[10]和政军,李锦轶,莫申国,等.漠河前陆盆地砂岩岩石地球化学的构造背景和物源区分析[J].中国科学(D辑),2003,33(12):1219-1226.
[11]Galbraith R F,Laslett G M.Statistical models formixed fission track ages[J].Nuclear Tracks and Radiation Measurements,1993,21(4):459-470.
[12]Sobel E R,Chen J,Heermance R V.Late Oligocene Early Miocene initiation of shortening in the Southwestern Chinese Tian Shan:Implications for Neogene shortening rate variations[J].Earth and Planetary Science Letters,2006,247:70-81.
[13]Sobel E R,Oskin M,Burbank D,et al.Exhumation of basementcored uplifts:Example of the Kyrgyz Range quantified with apatite fission track thermochronology[J].Tectonics,2006,25:1-17.
[14]Ketcham R A,Donelick R A,Carlson W D.Variability of apatite fission track annealing KineticsⅢ:Extrapolation to geological time scales[J].American Mineralogist,1999,84:1235-1255.
[15]Pan B T,Li Q Y,Hu X F,et al.Cretaceous and Cenozoic cooling history of the eastern Qilian Shan,north-eastern margin of the Tibetan Plateau:evidence from apatite fission-track analysis[J].Terra Nova,2013,25:431-438.
[16]朱文斌,张志勇,舒良树,等.塔里木北缘前寒武基底隆升剥露史:来自磷灰石裂变径迹的证据[J].岩石学报,2007,23(7):1671-1682.
[17]任建业,李思田,等.西太平洋边缘海盆地的扩张过程和动力学背景[J].地学前缘,2000,3:203-213.
[18]董树文,吴锡浩,吴珍汉,等.论东亚大陆的构造翘变——燕山运动的全球意义[J].地质论评,2000,1:8-13.