沉积期构造转换带类型、空间展布及其控制因素

发布时间：2019-06-03 02:18

【摘要】：为研究查干凹陷巴音戈壁组二段沉积期及苏红图组一段沉积期构造转换带类型及空间展布规律,并进一步明确其控制因素,在断裂体系解析基础上,采用同沉积断层生长指数的分析方法,进行古断裂体系恢复,参考构造转换带动态演化的综合分类模式,将构造转换带分为9种类型,每种类型按发育程度细分为初期、中期、后期3个时期。构造转换带类型多为平行亚类同向型中期、平行亚类同向型后期、平行亚类聚敛型中期等,主要分布于巴润断裂带。动力学机制显示,查干凹陷伸展作用由英格特-巴格毛德变质核杂岩活动导致的拆离滑脱引起,而走滑环境与阿尔金走滑断裂及其分支——巴丹吉林断裂的活动有关。沿巴润断裂带依次发育平行亚类同向型和平行亚类聚敛型构造转换带,主要与英格特-巴格毛德变质核杂岩拆离滑脱依次形成的同向、反向侧列断层有关;而同向、反向断层之间发育各型中期转换带,与阿尔金断裂及巴丹吉林的走滑活动有密切关系。
[Abstract]:In order to study the types and spatial distribution of structural transition zones in the second member sedimentary period of Bayinggobi formation and the first member of Suhongtu formation in Chagan sag, and to further clarify the controlling factors, on the basis of fault system analysis, By using the analysis method of synsedimentary fault growth index, the paleo-fault system is restored and the structural transformation zone is divided into nine types according to the comprehensive classification model of dynamic evolution of structural transformation zone, each type is divided into initial and middle stages according to the degree of development. There are three periods in the later period. Most of the structural transition zones are parallel subclass in the middle stage, parallel subclass in the later stage, parallel subclass accumulation type in the middle stage, mainly distributed in the Barun fault zone. The dynamic mechanism shows that the extensibility of the Chagan sag is caused by the detachment and slippage caused by the activity of the Ingert-Bagmaod metamorphosed core complex, and the strike-slip environment is related to the activity of the Altun strike-slip fault and its branch, the Badan Jilin fault. The parallel subclass synchronic type and parallel subclass convergent structural transition zone are developed along the Barun fault zone in turn, which are mainly related to the synchro and reverse lateral faults formed by the detachment and slippage of Ingert-Bagmaod metamorphic core complex in turn. In the same direction and reverse faults, various intermediate transition zones are developed, which are closely related to the Altun fault and the strike-slip activity of Badan Jilin.
【作者单位】：长江大学地球科学学院;
【基金】：大学生创新创业训练计划项目“查干凹陷巴二段—苏一段构造转换带类型及空间展布规律”(20150018)
【分类号】：P542

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