| 大巴山晚中生代陆内造山构造应力场 |
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| 关键词:Dabashan orogen Late Mesozoic tectonic stress field arc-shaped structure belt intra-continental orogeny multidirectional convergence |
| 基金项目:中石化海相前瞻性研究专项(编号: YPH08023)；深部探测与实验研究专项(编号: SINOPROBE-08-01)；中国地质科学院地质力学研究所基本科研项目(编号: DZLXJK200715) |
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| The Tectonic Stress Field in the Dabashan Orogen Resulting from Late Mesozoic Intra-Continental Orogeny |
| The Dabashan orogen, situated in the northern margin of the middle-upper Yangtze block, is marked by a large-scale oroclinal structure belt evidently extruding southwestwards. By dividing its framework and observing deformation in the field work, and combining with geochronologic data obtained in recent years, the authors rebuilt a stage of special stress field in the Dabashan orogen, which occurred during Late Mesozoic (late Middle Jurassic-early Late Cretaceous) and caused by intense intra-continental orogeny. The episode of the stress field, bounded by the Chengkou-Fangxian fault, is characterized by NE-SW trending tectonic compression in the Dabashan thrust belt, and outward emanational compression in the Dabashan foreland belt which is featured by E-W trending compression in the west segment, NE-SW striking compression in the middle, and S-N trending compression in the east, respectively, that is, it is approximately perpendicular to the oroclinal belt. Thus, controlled by the stage of stress field, and blocked from the two blocks of its west and east sides, the arc-shaped Dabashan foreland finally formed, which resulted from multidirectional convergence occurring in eastern Asia in late Mesozoic. |
| DONG Shu-wen,SHI Wei,ZHANG Yue-qiao,HU Jian-min,ZHANG Zhong-yi,LI Jian-hua,WU Hong-ling,TIAN Mi,CHEN Hong,WU Guo-li,LI Hai-long.2010.The Tectonic Stress Field in the Dabashan Orogen Resulting from Late Mesozoic Intra-Continental Orogeny[J].Acta Geoscientica Sinica,31(6):769-780. |
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