地学前缘 ›› 2011, Vol. 18 ›› Issue (4): 77-87.

• 论文 • 上一篇    下一篇

北祁连—酒西地区早白垩世盆地沉积特征与古地理演化

彭楠，旷红伟，柳永清   


  1. 1. 中国地质大学（北京） 地球科学与资源学院， 北京 100083
    2. 中国地质科学院 地质研究所， 北京 100037
  • 收稿日期:2011-01-10 修回日期:2011-05-06 出版日期:2011-07-18 发布日期:2011-07-20
  • 作者简介:彭楠（1983—），男，博士研究生，从事沉积地质学研究。E-mail: pengnan19830120@126.com
  • 基金资助:

    国家自然科学基金项目(90914003)；中国地质调查局项目(1212011085477)和中国地质科学院地质研究所中央公益性基本业务费专项基金项目（J1106）

Sedimentary evolution and palaeogeography of
the Early Cretaceous basins from the northern Qilian Mountains to Jiuxi areas.

  1. 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2011-01-10 Revised:2011-05-06 Online:2011-07-18 Published:2011-07-20

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摘要：

北祁连—酒西地区早白垩世沉积盆地（群）充填物、古流向和沉积环境等方面的调查研究认为：早白垩世在拉张—伸展的背景下形成了南抵中祁连山，北至北山地区，东达酒东盆地，西到阿尔金断裂带以西的泛北祁连—酒西盆地。盆地充填物表现出粗—细—粗的完整沉积旋回，古地理环境经历了冲积扇—河流—湖泊—河流的演变过程，并对应着湖盆从初始扩张—加剧扩张—最大扩张—萎缩消亡的完整过程。另外，盆地南侧的昌马—旱峡—红柳峡地区在下沟—中沟沉积时期为沉积沉降中心，这可能跟阿尔金断裂带在早白垩世中—晚期的走滑活动有关，并致使泛北祁连—酒西盆地的范围和深度达到最大。

关键词: 早白垩世；沉积特征；古地理；北祁连&mdash, 酒西盆地

Abstract:

Researches on the sediments, paleocurrents and depositional environments of the Early Cretaceous in northern QilianJiuxi areas show that an extensive basin (Northern QinlianJiuquan Lake), covering areas from the midQinlian Mountains in the south to the Beishan in the north and from the western Altyn Fault to Jiudong in the east, existed in the Early Cretaceous. Current study indicates that the Northern QinlianJiuquan Lake was involved in a sedimentary and palaeogeographical evolutionary history in succession, i.e., from initial alluvial fan, and then fluvial, followed by lacustrine and fluvial environment finally. Depositional succession consisting of sediments in a varied grain size from coarser, fine to coarser vertically was a result of the initial, increasing and maximum extension of the Northern QinlianJiuquan Lake. In addition, research suggests that Changma, Hanxia and Hongliuxia areas of the southern basin became the centers of subsidence and deposition resulting from strikeslip of Altyn Fault in the Early Cretaceous, and furthermore the basin extended to the maximum in space as a result.

Key words:  Early Cretaceous, sedimentary characteristics, paleogeography, northern QilianJiuxi Basin

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