燕山板内造山带中段近东西向中生代右行走滑构造系统

张长厚; 宋鸿林; 王根厚; 颜丹平; 孙卫华

燕山板内造山带中段近东西向中生代右行走滑构造系统

中国地质大学地球科学与资源学院, 北京 100083

基金项目:

国家自然科学基金 49702034

国家自然科学基金 49772148

中国地质调查局1∶25万青龙县幅 20001300005141

详细信息

作者简介:
张长厚(1964-), 男, 副教授, 1996年毕业于中国地质大学(北京), 获理学博士学位, 主要从事构造地质学与区域构造的教学与研究

中图分类号: P542
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出版历程
- 收稿日期: 2000-10-24
- 刊出日期: 2001-09-25

MESOZOIC DEXTRAL STRIKE-SLIP STRUCTURAL SYSTEM IN MIDDLE SEGMENT OF INTRAPLATE YANSHAN OROGENIC BELT, NORTHERN CHINA

Faculty of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 阐述了分布于燕山板内造山带中段的近东西向中生代右行走滑构造系统的几何学与运动学特征.指出该右行走滑断裂系统由古北口-平泉断裂和密云-喜峰口-锦西断裂两条主干断裂, 以及夹于其间的北西向张性断层和张裂脉、北东向压性断层和褶皱等共同组成.近东西向主干断裂具有右行右列“P破裂”结构形式, 北西向的张性断层和张裂脉则具有“T破裂”性质.主干断裂与北东向压性断裂和褶皱构成了一幅右行走滑双重构造(strike slipduplexes) 格局, 而不是不同期次变形的产物.该走滑断裂系统形成于侏罗纪末—早白垩世初(14 7~132 Ma).由于它恰好构成了位于辽西的走向北东、向南东逆冲的逆冲推覆构造系统与冀北、冀西北地区北东走向、上盘向北西逆冲的推覆构造的转换和调节部位, 所以本文提出了一个右行走滑构造系统的统一构造模式.在该模式中, 辽西和冀北、冀西北同时代而运动方向相反的逆冲构造系统分别构成了近东西向右行走滑系统的断盘前缘挤压逆冲构造区.认为形成该时期燕山板内造山带总体构造格局的区域构造作用方式是: 在总体北西-南东向挤压的一级构造应力场作用下, 造山带北部的块体相对于中生代华北地台为主体的块体做向东的右行运动.从更大尺度上看, 在华北克拉通与西伯利亚板块之间的构造域在二者相向运动的背景下, 燕山板内造山带可能构成了亚洲东部另一个重要的“挤出构造带”或“逃逸构造域”, 这种推测需要得到北部东西向断裂系具有同期左行走滑运动的支持.
- 走滑断裂系统 /
- 走滑双重构造 /
- 板内造山带 /
- 燕山 /
- 河北省
Abstract: The geometry and inner structures as well as the kinematics of the east-west dextral strike-slip fault system in the middle segment of the intraplate Yanshan orogenic belt are described. The dextral strike-slip fault system is composed of east-west oriented master faults - Gubeikou-Pingquan fault zone and Miyun-Xifengkou fault zone, with the structures between them such as the northeast strike contractional faults and associate folds, northwest oriented extensional faults and dykes as well. The master east-west faults are characterized by subordinate right lateral overstep en echlon faults. While the northwest striking extensional faults and dykes are comparable to "T fractures" expected by Riedel model. The northeast oriented contractional faults and related folds, meanwhile, are the counterparts of compressive structures in Riedel model. The combination of the master faults with the associate northeast fault and folds makes a strike-slip duplex structure. The strike-slip faults formed between later Jurassic and Early Cretaceous. Giving the temporal and spatial relationship among the east-west trending dextral strike-slip fault system and the southeast-ward thrust faulting in the eastern part and the northwestward thrust fault system in the western segment of the Yanshan belt, a unified tectonic model - dextral slip system has been established. This model leads to a renewed interpretation of the tectonic framework and evolution of the Mesozoic-Cenozoic intraplate Yanshan orogenic belt. In this model, the two thrust systems with opposite movement directions in western Liaoning and northwestern Hebei provinces are considered as the result of the compressions in the front of dextral strike-slip plates northeast and southwest of the master fault, respectively. It is reasonable to infer that the tectonic framework of the late Mesozoic intraplate Yanshan orogen is dominated by east-west dextral strike-slip faulting and related deformation. Furthermore, the intraplate Yanshan orogenic belt might be another "extrusion tectonic belt" or "escape tectonics" during the Jura-Cretaceous time in the frame of northeastern Asia. However, a synchronous sinistral strike-slip fault zone north to this belt is needed to prove this interpretation.
- strike-slip fault system /
- strike-slip duplex /
- intraplate orogenic belt /
- Yanshan /
- Hebei Province

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图 1 研究区区域大地构造位置及主要构造形迹

SGPF.尚义-赤城-古北口-平泉断裂; MXF.密云-喜峰口-青龙-锦西断裂; C.承德逆冲断层; E.鹅毛口逆冲断层; NB.南大寨-八宝山逆冲断层; S.十三陵逆冲断层; T.汤河口逆冲断层; XH.下花园逆冲断层; XL.兴隆逆冲断层

Fig. 1. Simplified tectonic map illustrating geologic settings and major structural traces of study area

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图 2 燕山中段断裂构造

J-K.侏罗系—白垩系分布区; Ch-T.中元古界长城系—三叠系分布区; AR.太古宇基底

Fig. 2. Sketch map showing distribution of major faults in middle segment of Yanshan belt

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图 3 兴隆县西部横穿东西向主干断裂的构造剖面(主要示断裂两盘的垂向位移)

a.朱家沟—正东峪—清水湖剖面; b.北台子—大苇塘—小柏栅剖面.AR.太古宇变质基底岩系; Chc.常州沟组; Chch.串岭沟组; Cht.团山子组; Chd.大红峪组; Chch-Chd. 串岭沟组、团山子组、大红峪组未分; Chg.高于庄组; Jxy.杨庄组; Jxw.雾迷山组; MXF.密云-喜峰口断裂系主断裂带(剖面位置见图 2)

Fig. 3. Two cross-sections across the Miyun-Xifengkou fault system showing mainly the relative vertical movement between the two plates

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图 4 马圈子-要路沟一带走滑断裂构造系统

J₂.中侏罗世沉积、火山岩系; Ch-Pz.长城系-古生界盖层; Chc.常州沟组; AR.太古宇基底变质岩.a.石岭子-明水塘一带张裂脉方位统计图(n=13);b.石岭子-明水塘一带张性断层方位统计图(n=5);c.石岭子-明水塘一带与主干断裂剪切方向相同的次级断裂方位统计图(n=9)

Fig. 4. Dextral strike-slip fault system around Majuanzi and Yaolugou town

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图 5 五指山-大杖子盆地张性断层和张裂脉分布

a.五指山-大杖子盆地张裂脉方位统计图(n=14);b.五指山-大杖子盆地张性断层走向方位统计图(n=54);Ch-Jx.长城系、蓟县系分布区; J₂t.髫髻山组; J₃t.土城子组; 1.正断层(伸展断层); 2.张裂脉; 3.走滑断层

Fig. 5. Extensional faults and associate dykes in Wuzhi-shan-Dazhangzi basin

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图 6 兴隆西南部前苇塘附近走滑断裂及伴生褶皱构造

a.伴生褶皱轴迹方位统计图解.Jxw.雾迷山组; Jxy.杨庄组; Chg^1~4.高于庄组第一至第四段; Chd.大红峪组; Chc-Chg.常州沟组-高于庄组; Chc.常州沟组; AR.太古宇

Fig. 6. Miyun-Xifengkou dextral strike-slip fault and related folds around Qianweitang Village, Xinglong county

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图 7 五指山-大杖子盆地北东向压性断层分布

Ch-Jx.长城系、蓟县系分布区; J₂t.髫髻山组; J₃t.土城子组; a.断裂方位统计图(n=40);其他图例同图 5

Fig. 7. Sketch map showing distribution of northeast trending contractional faults in Wuzhishan-Dazhangzi basin

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图 8 燕山板内造山带右行走滑构造系统与逆冲推覆构造形成模式

1.逆冲断层; 2.可能的主压应力方向; 3.块体间的相对运动; 4.相对运动的块体边界; 其他图例同图 1

Fig. 8. Distribution and an alternative geodynamic interpretation of dextral strike-slip and thrust fault systems in intraplate Yanshan orogenic belt

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