石油学报 ›› 2006, Vol. 27 ›› Issue (2): 20-27.DOI: 10.7623/syxb200602005

• 地质勘探 • 上一篇    下一篇

柴西阿尔金山南缘中生界古流特征

钟建华1,2, 尹成明2, 段洪亮1, 马锋1, 王海侨1, 温志峰1   

  1. 1. 中国石油大学地球资源与信息学院, 山东, 东营, 257061;
    2. 中国科学院广州地球化学研究所, 广东, 广州, 510640
  • 收稿日期:2005-04-22 修回日期:2005-10-08 出版日期:2006-03-25 发布日期:2010-05-21
  • 作者简介:钟建华,男,1957年8月生,1993年获中国科学院广州地球化学研究所博士学位,现为中国石油大学(华东)教授,博士生导师,主要从事沉积和构造地质方面的教学与科研工作.E-mail:zhongjh@mail.hdpu.edu.cn
  • 基金资助:
    国家自然科学基金(No.40503003);中国石油天然气集团公司创新基金(2002F70108)资助

Mesozoic paleocurrent properties in the southern edge of Altyn Mountain in the western Qaidam Basin

Zhong Jianhua1,2, Yin Chengming2, Duan Hongliang1, Ma Feng1, Wang Haiqiao1, Wen Zhifeng1   

  1. 1. Faculty of Geo-Resources and Information, China University of Petroleum, Dongying 257061, China;
    2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:2005-04-22 Revised:2005-10-08 Online:2006-03-25 Published:2010-05-21

摘要: 柴达木盆地西部(柴西)的阿尔金山南缘自三叠系到白垩系发育了一套陆源碎屑岩,厚度可达3~4km,露头条件非常好.其中,中、上三叠统及中、下侏罗统的陆源碎屑岩中发育了一些指示古流的沉积构造,主要有板状交错层理、槽状交错层理、爬升层理、槽模、炭化植物茎干及砾石.这些沉积构造指示柴西中生代古流格局比较复杂:在月牙山一带,中生代古流自北东流向南西,表明其物源区在北东方向,极有可能是以阿拉巴斯套为主体的古阿尔金山;在犬牙沟与采石岭一带,中生代的古流主要来自于南东方向和北东方向.前者可能与昆仑山和芒崖坳陷腹地的古隆起有关;后者可能与中部的砾石梁一带在中生代某些时期隆升形成“陆桥”而接通了来自北东方向阿拉巴斯套的水系有关.在砾石梁一带,中生代的古流格局则非常紊乱,表明其可能具有多个物源区.在阿拉巴斯套与昆仑山之间中生代发育了一个大的沉积坳陷(古泛芒崖坳陷),这个坳陷呈近东西向,坳陷中心在砾石梁与月牙山南侧一带.

关键词: 柴达木盆地西部, 阿尔金山, 中生界, 古流, 沉积构造

Abstract: A set of Triassic-Cretaceous terrestrial detrital rocks from 3000 meters to 4000 meters in thickness were developed in the southern edge of Altyn Mountain in the western Qaidam Basin.There are good exposures of Mesozoic strata in the southern edge of Altyn Mountain.A lot of well-preserved paleocurrent structures such as planar cross bedding,trough cross bedding and climbing bedding were developed in the mid-upper Triassic period and mid-lower Jurassic period.These sedimentary structures reveal that the current in the early Mesozoic went along the direction from northeast to southwest in the Yueyashan and went along two directions from southeast to northwest and from northeast to southwest in the Quanyagou.The later might be related to the short-period uplift of Lishiliang.The paleocurrent direction of the Mesozioc era in Lishiliang was considerably irregular.The paleocurrent analysis reveals that there was a large depression in the Mesozoic between Kunlun Orogen and Alabas Fold.

Key words: western Qaidam Basin, Altyn Mountain, Mesozoic, paleocurrent, sedimentary structure

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