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焉耆盆地北缘和静逆断裂-褶皱带第四纪变形

10.3969/j. issn. 0253-4967.2012.02.004

焉耆盆地北缘和静逆断裂-褶皱带第四纪变形李安1杨晓平1黄伟亮1伊力亚尔2

1)中国地震局地质研究所,活动构造与火山重点实验室,北京 100029

2)新疆维吾尔自治区地震局,乌鲁木齐830011

焉耆盆地是塔里木盆地东北缘天山山间的重要坳陷区,盆地北缘发育的和静逆断裂-褶皱带是一条现今活动强烈的逆断裂-褶皱带,对其第四纪以来缩短量和隆升量的计算有利于分析该区域的构造活动情况,对缩短速率和隆升速率的估计可以与天山造山带其他区域的活动速率进行横向对比,从而反映出焉耆盆地在天山晚新生代构造变形的作用。在深部资料不足的情况下,对背斜形态完整、构造样式简单的和静逆断裂-褶皱带,利用地表可获得的地层和断层产状,通过恢复褶皱几何形态,计算褶皱的缩短量、隆升量和断层滑动量,得到逆断裂-褶皱带早更新世晚期(1.8Ma)、中更新世(780ka)和晚更新世中期(80ka)以来的缩短量分别为1.79km、0.88km和26m,初步估计的缩短速率分别为0.99mm/a、1.13mm/a和0.33mm/a。显示和静逆断裂-褶皱带自开始形成以来构造活动强度并不一致。与地壳形变观测结果对比,作为南天山东段最主要的坳陷区,焉耆盆地吸收了这一区域(86° ~88°E)的大部分地壳缩短,且主要表现为盆地北缘新生逆断裂-褶皱带的强烈变形。

逆断裂-褶皱带;第四纪;缩短量;缩短速率;天山 ; 焉耆盆地

P315.2A0253-4967(2012)02-0240-14

2011-06-232012-03-08

财政部重点项目“我国重点监视防御区活动断层地震危险性评价”、中国地震局地震行业科研专

项(200808013)和国家自然科学基金(40572126)共同资助。

万方数据

南强北弱、西强东弱的整1

993;Allen etaL,1993;A

zl.,1998;Burchfiel etal.,万方数据

断裂,HLSF霍拉山断裂,

F焉耆盆地北缘断裂,ItJ

泥岩夹砂岩、砂岩、万方数据

间充填物为粗砂

-覆盖在西域砾岩万方数据

W lH7J^‘一‘…l1^,

斜形态出露完整

K登背斜、哈尔莫!万方数据

。…n,

交多的砂砾石层,粒

量较高,粒径一般1

色稍发白;上盘中i

;下精均来出铉:U2万方数据

墓H.,复原刚苜幂

陆合三角函数关

!的地层展平,得§

子地层长度的差促万方数据

【e constant line model of th

}几何形态和断层面滑动f口错

),H2为断层隆升量(复原的

,L2为断层水平缩短最(£2=

《平为直线.L3为钉线间未g万方数据

’夏尔木登背斜平±

短速率为1.13mm/

F均隆升速率为2.

:并不一致。

万方数据

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万方数据

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万方数据

QUATERNARY DEFORMATION OF THE HEJING THRUST-FOLD BELT ON NORTHERN MARGIN OF THE YANQI BASIN,

SOUTHERN TIANSHAN 

LI AnYANG Xiao-pingHUANG Wei-liangYiliyaer

李安,男,1983年生,在读博士生,研究方向为活动构造,电话:010-62009127,E-mail: antares_

lee@163.com。

万方数据

焉耆盆地北缘和静逆断裂-褶皱带第四纪变形

作者:李安, 杨晓平, 黄伟亮, 伊力亚尔, LI An, YANG Xiao-ping, HUANG Wei-liang,Yiliyaer

作者单位:李安,杨晓平,黄伟亮,LI An,YANG Xiao-ping,HUANG Wei-liang(中国地震局地质研究所,活动构造与火山重点实验室,北京 100029), 伊力亚尔,Yiliyaer(新疆维吾尔自治区地震局

,乌鲁木齐,830011)

刊名:

地震地质

英文刊名:Seismology and Geology

年,卷(期):2012,34(2)

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