郯庐断裂带北段构造样式解析
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本文为国家973项目(编号2009CB219305)的成果。本文获“东北亚生物演化与环境教育部重点实验室”、吉林大学“211”工程三期建设项目和2009年教育部基本科研业务经费(“吉林大学创新团队发展计划”)支持。


Analysis of Structural Styles in Northern Segment of Tancheng—Lujiang Fault Zone
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    摘要:

    郯庐断裂带(郯城—庐江断裂带)北段在中—新生代发生多期不同性质活动,形成各具特色的构造样式。各种构造样式和地层间切割或覆盖关系的匹配研究,为限定断裂带活动期次及时代,建立郯庐断裂带北段变形序列提供了第一手资料。不同构造样式反映了断裂带由老至新经历了以下5个重要的变形事件:① 密山县知一镇韧性剪切带黑云母40Ar/39Ar等时线年龄为161±3Ma,是郯庐断裂带再次发生大规模左旋走滑活动并扩展到东北地区的产物;② 四平市叶赫镇负花状断层系以及早白垩世早期东北断陷盆地群的形成,是郯庐断裂带北段在早白垩世早期发生强烈的走滑—伸展作用的重要依据;③ 四平市石岭子镇佳木斯—伊通断裂大型逆冲断层系和断层相关褶皱、桦甸县敦化—密山断裂“逆地堑”、沈阳—哈尔滨逆冲断裂是郯庐断裂带北段特征最明显、分布最广泛的构造样式,它们形成于晚白垩世嫩江运动—晚白垩世末期,反映了这一时期郯庐断裂带北段遭受到广泛而又强烈的右旋走滑—逆冲作用;④ 佳伊、敦密古近纪地堑是右旋走滑、伸展双重机制控制的产物;⑤ 在渐新世末期古近纪地堑的构造反转结束了地堑的演化;中新世郯庐断裂带北段上地幔剪切控制了新生代含幔源包体火山口沿断裂有规律的分布。上述5个重要的变形事件由老至新组成了郯庐断裂带北段较为完整的构造演化序列,它们是不同地球动力学机制的产物。

    Abstract:

    Multiperiodic and diversely characteristic activities happened in the northern segment of the Tancheng—Lujiang fault zone in Meso—Cenozoic, which formed structural styles with various characteristics. The matching study of various structural styles and the relationship between stratigraphic cutting and coverage provides the first hand information for limiting the active periods and era of the fault zone, establishing deformation sequence in the northern segment of the Tancheng—Lujiang fault zone.Different structural styles reflect that the fault zone from old one to new one has undergone the following five major deformation events: ① biotite 40Ar/39Ar isochron age of ductile shear zone near Zhiyi town,Mishan county is 161±3Ma, which is the product of the Tancheng—Lujiang fault zone recurrence of large scale sinistral strike slip that extends to the Northeastern region; ② the negative flower faults of Yehe town,Siping city and the formation of the northeastern fault basin group in the early period of Early Cretaceous are the important basis for the northern segment of the Tancheng—Lujiang fault zone suffering from strong strike slip and stretch in the early period of Early Cretaceous; ③ large scale thrust zone and fault related fold in Jiamusi—Yitong fault of Shiling town, Siping city, the "obsequent graben" in Dunhua—Mishan fault zone of Huadian City and Shenyang—Harbin thrust fault zone are the most obvious and wide distributed structural styles in the northern segment of the Tancheng—Lujiang fault zone formed in the Nenjiang movement of later period of Late Cretaceous and last stage of Late Cretaceous, which reflects the northern segment of the Tancheng—Lujiang fault zone subjected to the extensive and strong right lateral strike slip thrusting activity; ④ Paleogene graben in Jiayi and Dunhua—Mishan is the product controlled by double machanism of right lateral strike slip and extension; ⑤ the tectonic inversion of Paleogene graben in late Oligocene put an end to the graben evolution; the upper mantle shearing in the northeast segment of the Tancheng—Lujiang fault zone in Miocene controls the Cenozoic volcanic crater containing mantle enclave regularly distributed along the fault.The above five major deformational events from the old to the new formed a relatively complete tectonic evolutionary sequence of the northern segment of the Tancheng—Lujiang fault zone, which are the products of the different geodynamic machanism.

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王书琴,孙晓猛,杜继宇,王英德,许强伟,田景雄.2012.郯庐断裂带北段构造样式解析[J].地质论评,58(3):414-425,[DOI].
.2012. Analysis of Structural Styles in Northern Segment of Tancheng—Lujiang Fault Zone[J]. Geological Review,58(3):414-425.

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