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首页> 外文期刊>Journal of Asian earth sciences >Reactivation of a collisional suture by Miocene transpressional domes associated with the Red River and Song Chay detachment faults, northern Vietnam
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Reactivation of a collisional suture by Miocene transpressional domes associated with the Red River and Song Chay detachment faults, northern Vietnam

机译：越南北部与红河和宋蔡支队断层有关的中新世超高压穹顶恢复碰撞缝合线

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摘要

Elongate Miocene gneissose and granitic domes in northern Vietnam formed in a dextral-transpressional ductile shear regime, possibly associated with large-scale restraining step-overs along dextral faults. Initial anticlinal D1 doming involved folding of both basement and hanging wall rocks with D1 secondary folds that verge toward the anticlinal axes. Such folds reflect dome-scale flexural slip folding. With continued shortening, D2 detachment faults developed on the flanks of the anticlines along the hanging wall-basement interface, so that the basement was extruded vertically into the overlying hanging wall rocks. The detachment faults were associated with D2 drag folds that verge away from the anticlinal axes. The hanging wall assemblage lacks a well-ordered stratigraphy, displaying primarily block-in-matrix fabric. We identified bedded cherts, associated with umbers and alkalic basaltic intrusions within these hanging wall rocks, a first report of such rocks from Vietnam. The association of cherts, umbers, and basaltic intrusions and extrusions with block-in-matrix units with clastic rocks strongly suggest that the hanging wall rocks comprise part of a subduction complex. Because the base of a subduction complex is a former subduction megathrust horizon, the hanging wall-basement interface represents a reactivated collisional suture. Such a suture was probably associated with the Indosinian orogeny, and the basement should be the Indochina continental block. This structure may have influenced the position of Miocene dextral faulting in addition to controlling the position of the dome detachments. The well-known Red River fault marks the boundary of one of the domes, but in this region it appears to be a detachment (normal) fault rather than a dextral strike-slip fault. However, the association with the dome evolution with large-scale restraining step-overs suggests that dextral faulting associated with dome development may lie further away from the dome axes than the detachment. (C) 2015 Elsevier Ltd. All rights reserved.
机译：越南北部的伸长中新世片麻岩和花岗岩穹顶形成了右旋压延性韧性剪切体系，可能与沿右旋断层的大规模约束性越界有关。最初的背斜D1隆起涉及基底和悬壁岩石的折叠，而D1的次生褶皱向着背斜的轴线弯曲。这样的折叠反映了圆顶尺度的挠曲滑动折叠。随着持续缩短，D2分离断层沿着垂壁与基底的界面在背斜的侧面发育，因此基底被垂直地挤压到上覆的垂壁岩石中。脱离断层与D2的褶皱有关，这些褶皱远离背斜轴。悬挂墙组合物缺乏井井有条的地层，主要显示的是母体布。我们在这些垂悬的岩壁中发现了层状with石，这些岩层与琥珀和碱性玄武岩侵入有关，这是越南此类岩石的首次报道。石，黄褐色和玄武岩侵入体与具有碎屑岩的基质块单元的联系强烈表明，悬挂的围岩构成了俯冲复合体的一部分。因为俯冲复合体的基底是以前的俯冲巨推层，所以悬挂的壁-基底界面代表了重新激活的碰撞缝合线。这样的缝合线可能与印度支那造山运动有关，并且基底应该是印度支那大陆块。除了控制穹顶脱离的位置之外，这种结构可能还影响了中新世右旋断层的位置。著名的红河断层标志着一个穹顶的边界，但在该地区，它似乎是脱离（正常）断层而不是右旋走滑断层。但是，与穹顶演化和大规模抑制跨步的关联表明，与穹顶发育相关的右旋断层比穹顶离离穹顶轴更远。 （C）2015 Elsevier Ltd.保留所有权利。

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