|本期目录/Table of Contents|

[1]王锋,刘池洋,赵红格.鄂尔多斯地块西部南北向拆离滑覆构造[J].地球科学与环境学报,2004,26(01):17-20.
　WANG Feng,LIU Chi-yang,ZHAO Hong-ge.South-north trending detachment structures in the western ordos block[J].Journal of Earth Sciences and Environment,2004,26(01):17-20.
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第26卷
期数:
2004年第01期
页码:
17-20
栏目:
出版日期:
2004-03-20

文章信息/Info

Title:
South-north trending detachment structures in the western ordos block
作者:
王锋1; 2; 刘池洋1; 赵红格1
1.西北大学地质学系,陕西西安710069;2.长安大学地球科学与国土资源学院,陕西西安710054
Author(s):
WANG Feng1; 2; LIU Chi-yang1; ZHAO Hong-ge1
1 .Department of Geology , Northwest University , Xi'an 710069 , China ;2 .School of Earth Sciences and Resources Management Chang'an University , Xi'an 710054 , China
关键词:
逆冲推覆; 拆离滑覆; 地震剖面; 形成时限; 发育背景; 运动方式
Keywords:
thrust nappe ; detachment gliding ; seismic section; formation time limitation; developing background; movement mode
分类号:
TE121.2
DOI:
-
文献标志码:
A
摘要:
鄂尔多斯地块西部东西向的推覆构造及基底拆离现象已有较多的讨论和研究。对重力作用下 的南北向基底拆离滑覆现象还未见讨论。以地震反射特征的明显差异为依据,结合区域地质特征,研究 了鄂尔多斯地块西部南北向基底拆离形成的韦州石沟驿拆离滑覆构造。它在地震剖面上表现为:滑脱 面以上的多层平行反射、不出现逆冲推覆前缘带复杂变形造成的杂乱反射;平面上形成与周邻明显的构 造不协调性。韦州石沟驿拆离滑覆构造形成于晚侏罗世地块西部大规模的东西向逆冲推覆造成的南 高北低的构造背景下,在重力作用下由南至北沿T9界面附近的煤系地层拆离滑覆,在东、西、北均以断 层与周邻相接,为一外来岩席构成的复式向斜,构造变形相对简单。
Abstract:
South-north trending detachment structures in the basement of the western ordos block have not been documented yet though both of the east-west trending thrust and the basement detachment structures in the western ordos block werewell studied .On the basis of distinct reflection features in the seismic section and the relevant geological setting it is revealed that the Weizhou-Shigouyi detachment structure , as the result of the northward decollement of the western ordos block, exhibits multi-layer reflection above the detachment surface and there is a scarcity of chaotic reflection related to complicated deformation in the frontier of a thrust belt .This detachment structure is notably incompatible with its neighboring areas in the regional structure and was formed in the Late Jurassic when the east-west napping led to a northwards descending terrain .The gravity drive is interpreted as the major cause of the northerly detachment along the coal layer in the proximity of the T9 boundary .As a result, the Weizhou-Shigouyi detachment structure is bounded on the east and west by faults and occurs as a synclinorium comprising exotic sheeted rocks with simple deformation .Importantly , this study may help to understanding the tectonic evolution and planning the petroleum exploration.

参考文献/References:

[1] 杨俊杰, 张伯荣.鄂尔多斯盆地西缘掩冲构造带的基本特征 [A] .见:杨俊杰.鄂尔多斯盆地西缘掩冲带构造与油气[C] .兰 州:甘肃科学技术出版社, 1990 .91 ～ 105.
[2] 汤锡元, 锅忠铭.陕甘宁盆地西缘逆冲推覆构造及油气勘探 [M] .西安:西北大学出版社, 1992.
[3] 汪泽成, 王玉新.鄂尔多斯盆地西缘马家滩滑脱型冲断构造 [J] .石油与天然气地质, 1996, 173):221 ～ 224 .

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备注/Memo

备注/Memo:
[收稿日期]2003-02-21
[作者简介]王锋1966-),男,陕西蓝田人,长安大学讲师,西北大学博士研究生,现从事石油及构造地质教学与科研工作。
更新日期/Last Update: 2004-03-20