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鄂尔多斯盆地周边地带新构造演化及其区域动力学背景

张岳桥1,廖昌珍2,施炜3,胡博1   

  1. 1.南京大学地球科学系,江苏南京 210093;2.中国地质大学地球科学与资源学院,北京 100083;3.中国地质科学院地质力学研究所,北京 100081
  • 收稿日期:2006-09-20 修回日期:2006-09-20 出版日期:2006-09-20 发布日期:2006-09-20

Neotectonic Evolution of the Peripheral Zones of the Ordos Basin and Geodynamic Setting

ZHANG Yue-qiao1, LIAO Chang-zhen2, SHI Wei3, HU Bo1   

  1. 1. Earth Sciences Department, Nanjing University, Nanjing 210093, China; 2.
  • Received:2006-09-20 Revised:2006-09-20 Online:2006-09-20 Published:2006-09-20

摘要: 系统研究了松辽盆地泰康地区青山口组沉积相类型及沉积特征.对其中青一段与青二、三段的沉积相平面分布与垂向演化规律做了较深入的探讨.青山口组主要发育湖泊相与三角洲相2种沉积相类型,湖泊相包括2种亚相与4种微相,三角洲相包括2种亚相和2种微相.青一段以深湖、半深湖相泥岩沉积为特征,青二、三段以浅湖相与三角洲相砂泥岩互层为特征.区内青山口组主要存在3种类型的储层砂体,分别为三角洲前缘河口坝砂体、三角洲前缘远砂坝砂体和浅湖砂体,其中浅湖砂体是最好的含油砂体,浅湖砂体发育的优势区也即浅湖沉积亚相发育区是区内最重要的油气富集区,是今后油气勘探的有利地区

Abstract: based on satellite imagery interpretation, field structural measurements and morpho-tectonic analysis, this paper makes a brief synthesis on Cenozoic extensional history of the graben systems around the Ordos basin and delimits the lower bound of the initial age, 8 -9 Ma, of Neotectonic era in the peripheral zones of Ordos. Neotectonic evolution has been divided into 3 stages with distinct morpho-tectonic features. An early stage during the Latest Miocene to Early Pliocene was characterized by development of the Red clay basin and by initiation of the Shanxi graben system. The peripheral zones of the Ordos was dominated by transtension. A middle stage during the Late Pliocene and middle Pleistocene experienced multi tectonic events that were characterized by episodic compressive deformation along the SW margin, continued subsidence of the graben system along NW and SE margins, uplift of the Ordos basin and development of erosional valley and river terraces along the Jin-Shan deep incised valley of the Yellow River. The most recent neotectonic stage since the middle to Late Pleistocene was dominated by deformation of transpression and transtension in the peripheral zones of Ordos, with intensification of differential vertical motion and river incision. Fault activities during the neotectonic era include different combination of normal, sinistral and dextral strike-slip and reverse faulting. The Ordos block itself rotates around vertical axis, which was accommodated by normal faulting and crustal extension along the graben system. The episodic evolution of neotectonics in the Ordos regions has been dynamically related to fast northward growth and episodic eastward extrusion of Tibetan Plateau during the Late Cenozoic time