机构地区: 中国地震局地质研究所
出 处: 《新疆石油地质》 2008年第3期271-277,共7页
摘 要: 自海西运动以来,准噶尔盆地边缘构造带经历了海西运动期强耦合为主阶段、中生代至新生代早期弱耦合及调整阶段、新近纪南缘单边盆山强耦合阶段;边缘构造带活动强度自海西运动期以来呈明显下降态势,至中生代为低平缓弱活动调整态,新生代造山期强度又呈回升状,但未达到海西运动期水平,呈现强-弱-强的三阶段式演化特点。准噶尔盆地的6边形边缘带划分为6个边缘构造带分段构造组合:准噶尔盆地南缘西段、南缘东段、准东隆起西缘段、乌伦古边缘构造段、加依尔山边缘段和准噶尔盆地西部边缘段。各构造段表现出明显的构造样式差异,其中,准噶尔盆地南缘西段为推覆前方无约束的舒展逆冲推覆系统;准噶尔盆地南缘东段为指向前陆的强约束逆冲推覆构造;准东隆起西缘段为隆升背景上的东西向水平挤压变形带;准噶尔盆地东北缘段(乌伦古边缘构造段)为多层滑脱面断坡控制的膝折型断阶和断坪控制的基底凹陷等;准噶尔盆地西北缘为多期次不同规模的逆冲和推覆叠置系统,准噶尔盆地西部边缘段为隆升背景下侧向挤压的断弯-断展机制的膝折带构造。 Researches indicate that the marginal structural belt of Junggar basin undergone the phases of strong coupling of Hercynian, weak coupling and adjustment from Mesozoic to early Cenozoic as well as strong coupling of southern margin of Junggar basin since Neogene. The degree of activity of marginal structural belt of Junggar basin assumes obvious decline since Hercynian, weak adjustment in Mesozoic and reascending in Cenozoic with less level than in Hercynian. Such orogenic events allowed the hexagon marginal belt with distinct structural configurations of Junggar basin to be divided into 6 marginal structural segments such as west segment (free restricted thrust nappe) and east segment (strong restricted thrust nappe) of southern margin of the basin, western margin segment (EW compression-deformation belt) of Zhundong (east Junggar) uplift, northeast segment or Ulungu segment (kink fault terrace and basement sags), northwestern margin segment or Zhayir segment (thrust-nappe superimposed system) and west Junggar marginal segment (kink belt structure).
领 域: [石油与天然气工程]