| 胶东半岛乳山地区低角度韧性剪切带几何学、运动学特征:对中国东部岩石圈减薄作用的启示 |
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| 引用本文： | 郝志宣,金超,田忠华,李同宇,文飞.胶东半岛乳山地区低角度韧性剪切带几何学、运动学特征:对中国东部岩石圈减薄作用的启示[J].地质科学,2022,57(1):43-60. |
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| 作者姓名： | 郝志宣 金超 田忠华 李同宇 文飞 |
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| 作者单位： | 河北工程大学地球科学与工程学院 河北邯郸 056038;河北工程大学地球科学与工程学院 河北邯郸 056038;河北省资源勘测研究重点实验室 河北邯郸056038;中国地质科学院地质研究所 北京 100037;中国科学院地质与地球物理研究所 北京 100029 |
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| 基金项目： | 国家自然科学基金青年基金项目(编号:42005133)；;中国地质调查局地质大调查项目“华北陆块中部与东部前寒武纪基础地质调查”(编号:DD20190003)； |
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| 摘 要： | 大规模伸展构造是华北克拉通东部岩石圈减薄的重要表现形式。部分低角度韧性剪切带是地壳伸展变形后所展现的构造形式。本文研究了王格庄韧性剪切带的岩石学、几何学、运动学等特征显示:韧性剪切带走向近南北向,剪切带断层面倾向多变(倾向西、西南、西北方向)。大部分区域面理低角度倾向西,矿物拉伸线理近东西向,不对称旋转碎斑及S-C组构指示顶端指向西的剪切特征。结合研究区西侧与伸展构造相匹配的半地堑伸展盆地证据:本研究认为伸展构造的形成可能与西太平洋板块的后撤相关,即大规模伸展构造作用引发了华北克拉通东部的地壳减薄作用。
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| 关 键 词： | 低角度韧性剪切带 伸展构造 锆石U-PB定年 苏鲁构造混杂带 板块后撤 |
Geometrical and kinematic characteristics of low angle ductile shear zone in Rushan area of Jiaodong Peninsula and their implications for lithospheric thinning in eastern China |
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| Hao Zhixuan,Jin Chao,Tian Zhonghua,Li Tongyu,Wen Fei.Geometrical and kinematic characteristics of low angle ductile shear zone in Rushan area of Jiaodong Peninsula and their implications for lithospheric thinning in eastern China[J].Chinese Journal of Geology,2022,57(1):43-60. |
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| Authors: | Hao Zhixuan Jin Chao Tian Zhonghua Li Tongyu Wen Fei |
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| Institution: | (School of Earth Sciences and Engineering,Hebei University of Engineering,Handan,Hebei 056038;Hebei Key Laboratory of Resource Survey and Research,Handan,Hebei 056038;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029) |
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| Abstract: | Large-scale extensional tectonic is an essential manifestation of lithospheric thinning in the eastern North China Craton. Part of the low-angle ductile shear zone is a structural exhibition after crust deformation. In this paper, we decipher the petrological, geometric, and kinematic features of the Wanggezhuang ductile shear zone, showing that: the shear zone strikes N-S with several dipping directions(W, SW, and NW). Most of the foliation dips to the west at a low dipping angle, mineral stretching lineations plunge to W at low plunge angle;Asymmetric rotational porphyroclast and S-C fabrics indicate a top-to-west shearing.Integrating evidence of half-graben extensional basin matched with extensional structure from the west of the shear zone: we presented that the extensional event was produced by the retreat of the Paleo-pacific plate, that is, huge extensional structural result in crustal thinning in North China Craton. |
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| Keywords: | Low-angle ductile shear zone Extensional structure Zircon U-Pb dating Sulu structural mélange belt Plate retreat |
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