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贺兰山三叠纪盆地构造属性再分析
投稿时间:2008-07-01  修订日期:2008-09-28  点此下载全文
引用本文:张进,李锦轶,马宗晋,任文军.2009.贺兰山三叠纪盆地构造属性再分析[J].地质学报,83(9):1233-1246.
zhang jin,Li Jinyi,Ma Zongjin,Ren Wenjun.2009.Rediscussion on the tectonic setting of the Triassic basin in the Helanshan Mt[J].Acta Geologica Sinica,83(9):1233-1246.
DOI:
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附件
作者单位E-mail
张进 中国地震局地质研究所 zhangjinem@sina.com 
李锦轶 中国地质科学院地质研究所  
马宗晋 中国地震局地质研究所  
任文军 东方物探公司长庆物探处  
基金项目:国家重点基础研究发展计划(2007CB411306, 2001CB409810)、中国地质调查局(1212010611806)和国家青年自然科学基金(484562145986)
中文摘要:摘要:对贺兰山北段三叠系构造背景的理解具有重要的理论和实践意义,本文通过对该地区周边同期构造事件的分析,结合最近的研究成果,认为贺兰山北部三叠纪沉积的构造背景类似于新生代早、中期莺歌海拉分盆地形成的环境。晚三叠世-早侏罗世由于巴彦乌拉山-狼山韧性剪切带的左行走滑,致使巴彦乌拉山崛起,它类似于目前的红河-哀牢山剪切带中的哀牢山,而在贺兰山北部由于该断层的左行走滑形成了走滑拉分盆地,堆积了巨厚的上三叠统延长组和侏罗系碎屑岩。虽然在三叠纪地理上贺兰山地区与鄂尔多斯盆地可能相连,但两者的沉降机制并不相同,它们的关系可能类似与目前的莺歌海盆地与南海盆地的关系。在晚侏罗世,该地区的拉分盆地由于受到阿拉善地块的东向挤压而反转。造成巴彦乌拉山-狼山韧性剪切带左行活动的原因是晚三叠世-早侏罗世鄂尔多斯盆地相对于阿拉善地块的左行压扭运动,其动力则可能来自中朝板块与扬子板块的碰撞。该模型不仅可以解释贺兰山北段三叠纪区别于鄂尔多斯盆地本部的强烈伸展,还能解释该地区分布局限的板内拉斑玄武岩的原因,而且也能够将晚三叠世巴彦乌拉山的隆起与该地区同时期的沉积以及阿拉善地块南缘的变形联系起来,而从区域上也可以解释同时期南蒙古地区的发育的左行走滑构造及其相关沉积。
中文关键词:贺兰山,晚三叠世-早侏罗世,走滑拉分,巴彦乌拉山-狼山断裂,鄂尔多斯盆地
 
Rediscussion on the tectonic setting of the Triassic basin in the Helanshan Mt
Author NameAffiliationE-mail
zhang jin Institute of Geology, CEA zhangjinem@sina.com 
Li Jinyi Institute of Geology, CAGS, Beijing  
Ma Zongjin Institute of Geology, CEA  
Ren Wenjun 5) Department of Chang Qing Geophysical Survey, BGP Geophysical Research Institute  
Abstract:Abstract:There are some debates on the tectonic setting of the northern Helanshan in the Late Triassic-Early Jurassic, but it has important academic and practical significances. Based on the analysis on the tectonic events occurring around the Helanshan Mt. and recent studies, the authors suggest that the tectonic setting of the northern Helanshan Mt. in the Late Triassic-Early Jurassic may be similar to that of the Yinggehai pull apart basin in the Early-Middle Cenozoic. During the Late Triassic-Early Jurassic, the Bayanwulashan Mt. uplifted due to the left lateral strike-slipping of the Bayanwulashan-Langshan fault, which is similar to the Ailaoshan Mt. along the Red river-Ailaoshan shear zone, and this left lateral strike-slipping resulted in the formation of pull apart basin in the northern Helanshan Mt., in this basin thick Upper Triassic Yanchang Formation and Jurassic strata had deposited. Although the northern Helanshan Mt. and the Ordos basin may connect with each other geographically, their depositional mechanisms were different, the relationship between the northern Helanshan basin and the Ordos basin may be same to that between the Yinggehai basin and the South China sea basin. During the Late Jurassic, this pull-apart basin reversed resulting from the eastward compression of the Alxa Block. The reason for the left-lateral strike-slipping of the Bayanwulashan-Langshan ductile shear zone was the relative left-lateral transprssion between the Alxa Block and the Ordos Block in the Late Triassic-Early Jurassic, which resulted from the collision between the Sino-Korean Plate and the Yangtze Plate. This model could explain not only the strong extension of the northern Helanshan Mt. different the main Ordos basin in the Late Triassic-Early Jurassic, but also the reason for the limited distribution of the intraplate tholeiite, furthermore it could also interpret the relationships between the uplifting of the Bayanwulashan Mt. and deposition in the northern Helanshan Mt. and the deformation along the southern Alxa block during the same time, and regionally this model could also explain the left-lateral strike-slipping and related sediments developing in the southern Mongolia in the same time.
keywords:Helanshan Mt., Late Triassic-Early Jurassic, pull-apart basin, Bayanwulashan-Langshan fault, Ordos basin
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