Deformation history of the Hengshan-Wutai-Fuping Complexes: Implications for the evolution of the Trans-North China Orogen
Deformation history of the Hengshan-Wutai-Fuping Complexes: Implications for the evolution of the Trans-North China Orogen
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横山-五台-富平杂岩体的变形历史：对跨华北造山带演化的启示
DOI：
10.1016/j.gr.2010.03.003
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发表时间：
2010-11
影响因子：
6.1
通讯作者：
Jian Zhang
中科院分区：
文献类型：
--
作者：
Simon A.Wilde;Sanzhong Li;Guo Wei Zhang;Guochun Zhao;Min Sun;Liming Dai;Jian Zhang
横贯华北造山带将华北陆块划分为两个小陆块：东陆块和西陆块。恒山-五台-阜平杂岩是造山带中部最大的出露体之一，由五台杂岩、恒山杂岩、阜平杂岩和滹沱群四个岩石构造单元组成。恒山杂岩中含有高压镁铁质麻粒岩和退变质榴辉岩。构造分析表明，这些杂岩中的大多数岩石经历了三幕不同的褶皱（D1-D3）和两期韧性逆冲剪切（D1-D2之间的STZ 1和D3之后的STZ 2）。D1变形在恒山杂岩和阜平杂岩中形成了贯通的轴面叶理（S1）、矿物拉伸线理（L1）和保存稀少的小型等斜褶皱（F1）。而五台杂岩中，沉积成分层则显示出规模较大的F1平卧褶皱，具SW走向。穿透换位导致的逆冲岩片的叠加，其中分离的韧性剪切带（STZ 1）。恒山杂岩和五台杂岩中的STZ-1的运动学指标显示，自上而下至S230 °W的逆冲推覆作用可能与北东向的斜向碰撞前俯冲作用有关。D_1期地壳增厚，并伴随着双峰变质作用。滹沱群没有经历D1变形，这可能是因为沉积作用与D1变形同期发生，也可能是因为该群处于高构造层次，没有受到早期变形的直接影响。D2变形产生了北西向的不对称平卧褶皱。D_2变形是华北陆块东、西陆块碰撞的结果。在滹沱群和阜平杂岩中，发育了与D2有关的向东偏东的不对称致密褶皱。D_1和D_2叠加形成的构造样式是横山-五台-阜平杂岩中的复合型构造样式。D3变形后期，四个岩石构造单元叠加。D3变形发育北西向开阔直立褶皱。继续碰撞导致了压扭韧性剪切带（STZ 2）的发育，分别在北方衡山杂岩和南方衡山杂岩之间形成了朱家坊右旋压扭韧性剪切带，在阜平杂岩和五台杂岩之间形成了龙泉关左旋韧性剪切带。STZ 1和D2变形可能是高压镁铁质麻粒岩和退变质榴辉岩快速同碰撞折返的原因。衡山-五台-阜平杂岩的构造样式和变形历史的阐明对东、西陆块之间的大洋岩石圈在东陆块西缘之下经历了北东向斜向俯冲的构造模式提供了重要的制约。该洋的最终闭合导致两块体的碰撞，形成华北陆块的相干基底。
The Trans-North China Orogen separates the North China Craton into two small continental blocks: the Eastern and Western Blocks. As one of the largest exposure in the central part of the orogen, the Hengshan–Wutai–Fuping Complexes consist of four lithotectonic units: the Wutai, Hengshan and Fuping Complexes and the Hutuo Group. The Hengshan Complex contains high pressure mafic granulites and retrograded eclogites. Structural analysis indicates that most of the rocks in these complexes underwent three distinct episodes of folding (D1to D3) and two stages of ductile thrust shearing (STZ1between D1and D2and STZ2after D3). The D1deformation formed penetrative axial planar foliations (S1), mineral stretching lineations (L1), and rarely-preserved small isoclinal folds (F1) in the Hengshan and Fuping Complexes. In the Wutai Complex, however, large-scale F1recumbent folds with SW-vergence are displayed by sedimentary compositional layers. Penetrative transposition resulted in stacking of thrust sheets which are separated by ductile shear zones (STZ1). The kinematic indicators of STZ1in the Hengshan and Wutai Complexes show top-to-the-S230°W thrusting likely related to northeastward, oblique pre-collisional subduction. D1resulted in crustal thickening with resultant prograde peak metamorphism. The Hutuo Group did not undergo the D1deformation, either because sedimentation was coeval with the D1deformation or because it was at a high structural level and was not influenced directly by the early deformation. The D2deformation produced NW-verging asymmetric and recumbent folds. The D2deformation is interpreted to have resulted from collision between the Eastern and Western Blocks of the North China Craton. In the Hutuo Group and the Fuping Complex, the development of ESE-verging asymmetric tight folds is associated with D2. The structural pattern resulting from superimposition of D1and D2is a composite synform in the Hengshan–Wutai–Fuping Complexes. All four lithotectonic units were superposed during the later D3deformation. The D3deformation developed NW-trending open upright folds. Ongoing collision led to development of transpressional ductile shearing (STZ2), forming the transpressional Zhujiafang dextral ductile shear zone between the northern Hengshan Complex and the southern Hengshan Complex, and generating the sinistral Longquanguan ductile shear zone between the Fuping Complex and the Wutai Complex, respectively. The STZ1and D2deformation were possibly responsible for fast syn-collisional exhumation of the high pressure mafic granulites and retrograded eclogites. The structural patterns and elucidation of the deformation history of the Hengshan–Wutai–Fuping Complexes places important constraints on the tectonic model suggesting that an oceanic lithosphere between the Eastern and Western Blocks underwent northeastward-directed oblique subduction beneath the western margin of the Eastern Block, and that the final closure of this ocean led to collision between the two blocks to form the coherent basement of the North China Craton.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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通讯作者：
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