伊犁盆地前侏罗纪反EW向构造对侏罗系煤系地层保存影响
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摘要
据伊犁盆地伊宁凹陷南缘、北缘及伊犁盆地中央隆起带的西段南缘、阿吾拉勒凸起两侧及内部煤系地层保存、阿吾拉勒山金属成矿区航磁异常分布及巩留-新源凹陷地震解释,综合显示盆内沉积区和盆缘隆起区构造呈东西分割、南北分带状,可能属前侏罗纪反EW向构造形迹,控制侏罗纪(燕山早期)聚煤期煤系地层呈NS向展布。在准噶尔盆地、塔里木地台相向旋转对压背景下,于燕山晚期东压西张向西凸出"逃逸",后在喜山期NS向对冲作用下原有构造隆坳叠加,逐渐形成东西构造主线上东西分割构造格局的三角形盆地形态。现今残存的前侏罗纪反EW向构造向斜部位为阿吾拉勒山及附近剥蚀区煤层保存有利部位。
Anti E-W strictures proofs include as followings:coal preservation in southern and northern margin of Yining Sag,southern margin of western Middle Uplift,two sides of Awulale Mountain,isoline distribution of aeromagnetic anomaly in polymetallic deposit-accumulated area of Awulale Mountain and reflection characters on seismic profiles in Gongliu-Xinyuan Sag.All of the integrated geological factors above direct the distribution of E-W segments and N-S zones that are likely to belong to the features of pre-Jurassic anti E-W structures.Those anti E-W structures control coal accumulation extending N-S trending during Jurassic period(i.e.,Early Yanshan).During Late Yanshan,lateral compression(clockwise and anticlockwise) acted by Jungar and Tarim platforms make those anti E-W structures within Yili Basin escape westwards and express stress state of eastern extension and western compression.S-N trending compression during Himalayan period makes Late Yanshan structures(uplift and depression) superposed as E-W segments,composed of delta Yili Basin on the E-W tectonic setting.Current remnant synclines of pre Jurassic anti E-W structures are the favored positions over eroded area near Awulale Mountain.
Anti E-W strictures proofs include as followings:coal preservation in southern and northern margin of Yining Sag,southern margin of western Middle Uplift,two sides of Awulale Mountain,isoline distribution of aeromagnetic anomaly in polymetallic deposit-accumulated area of Awulale Mountain and reflection characters on seismic profiles in Gongliu-Xinyuan Sag.All of the integrated geological factors above direct the distribution of E-W segments and N-S zones that are likely to belong to the features of pre-Jurassic anti E-W structures.Those anti E-W structures control coal accumulation extending N-S trending during Jurassic period(i.e.,Early Yanshan).During Late Yanshan,lateral compression(clockwise and anticlockwise) acted by Jungar and Tarim platforms make those anti E-W structures within Yili Basin escape westwards and express stress state of eastern extension and western compression.S-N trending compression during Himalayan period makes Late Yanshan structures(uplift and depression) superposed as E-W segments,composed of delta Yili Basin on the E-W tectonic setting.Current remnant synclines of pre Jurassic anti E-W structures are the favored positions over eroded area near Awulale Mountain.
引文
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