地学前缘 ›› 2012, Vol. 19 ›› Issue (5): 255-273.

• 论文 • 上一篇    下一篇

伸展作用序列及其深部背景: 以晚中生代以来鲁西隆起和济阳坳陷为例

李理，钟大赉，杨长春，时秀朋，胡秋媛，赵利，孙钰皓，刘卉   

  1. 1. 中国石油大学（华东） 地球科学与技术学院， 山东 青岛 266555
    2. 中国科学院 地质与地球物理研究所， 北京 100029
    3. 中石化胜利油田分公司西部研究院， 山东 东营 257015
    4. 中国石油大学 胜利学院， 山东 东营 257061
  • 收稿日期:2012-02-21 修回日期:2012-06-20 出版日期:2012-09-10 发布日期:2012-09-10
  • 作者简介:李理（1967—）, 女, 博士, 教授, 硕士生导师, 在站博士后，从事构造地质和油气区构造教学和研究工作。E-mail：lilywmwys@upc.edu.cn
  • 基金资助:

    国家自然科学基金项目（40772132）

Extension order and its deep geological background: Evidence from Western Shandong Rise and Jiyang Depression in the Late MesozoicCenozoic.

  1. 1. School of Geosciences, China University of Petroleum（East China）, Qingdao 266555, China
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    3. West Institute of Shengli Oilfield Branch Co., Sinopec, Dongying 257015, China
    4. Shengli Institute of China University of Petroleum, Dongying 257061, China
  • Received:2012-02-21 Revised:2012-06-20 Online:2012-09-10 Published:2012-09-10

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摘要：

露头区野外地质调查、隐伏区地质与地球物理资料研究表明，晚中生代—新生代鲁西隆起区和济阳坳陷区正断层发育，包括陡倾斜的控凹边界断层和缓倾斜的滑脱断层两类，两者构成伸展滑脱半地堑，且滑脱构造在隆起北部和坳陷南部最发育。KAr和FT测年结果指示伸展断层的发育时间为176~103 Ma、67～49 Ma和42～25 Ma 3个时期。隆起区、坳陷区陡断层分别在中地壳22 km 和15 km左右变平，成为拆离滑脱断层。构造物理模拟表明，在伸展＋塑性物质上涌机制下隆起区和坳陷区正断层均具有由南向北的发育极性，大致对应中侏罗世—早白垩世、古新世—早始新世、中始新世—渐新世3个发育阶段，且伴随控凹断层发育的同时，断块掀斜引起滑脱断层同步发育。层析成像表明中生代早期扬子板块沿作为转换断层的郯庐断裂以近EW向与华北板块俯冲的残留体可能导致晚中生代地幔物质上涌，新生代地幔上涌则可能与太平洋板块与欧亚板块俯冲及印欧板块碰撞的远程效应有关。研究区正断层受控于地幔物质上涌+伸展作用，以齐河—广饶断层为界呈前展式分别由南向北发育，并控制着坳陷区油气的形成、运聚和分布向北迁移。

关键词: 伸展作用序列；正断层；滑脱断层；晚中生代&mdash, 新生代；山东省西部

Abstract:

This thesis studies the evolution of normal faults and the relationship between the Western Shandong Rise (WSR) and Jiyang Depression (JD), and discusses their possible formation deep background or mechanism. The study reveals the existence of steep key faults and décollement structures in both shallow and deep levels in western Shandong, China. The steep faults controlled the formation of halfgraben and detachment at a depth of 1222 km and up to 30 km distance to the south, while the most outstanding shallow décollement structures occurred along the regional unconformity surface between the Cambrian and Archean, and the disconformity surface between the Carboniferous and Ordovician with main direction to the NNW and NNE. The décollement structure surface manifests as a fault zone with cataclastic rocks, asymmetrical folds and cleavages and occurred most obviously in north of the WSR and south of the JD. They occurred in opposite dip, faulted from south to north with approximately the same time in the Late JurassicCretaceous 176103 Ma, the PaleoceneEarly Eocene 6749 Ma, and the Middle EoceneOligocene 4225 Ma according to KAr and FT dating. Physical simulation indicated that the steep fault developed from south to north on piggyback propagation. Seismic tomography reveals that the extension fault system probably initiated by mantle upwelling derived from subduction and collision of the Yangtze Plate with the North China Plate along the TanchengLujiang Fault in the Late TriassicEarly Jurassic. This circumstance implies a multidirection subduction and collision of these two plates in the Mesozoic. In the Cenozoic, Vshaped mantle heading north caused by PacificEurasian Plate subduction and IndoEurasin Plate collision resulted in the extension order from south to north. Meanwhile, the older age magmatic rocks occurred in south while the younger ones existed in north in the Late Mesozoic, which shows that the magmatism migration pole is from south to north. The extension order controls the formation of the fault, half graben, sedimentary characteristics and oilgas distribution.

Key words: extension order, normal fault, décollement fault, Late MesozoicCenozoic, West Shandong Province

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