根据波希米亚山丘的岩石学和地震学数据确定的瓦利斯卡缝合线的位置和极性以及对欧洲瓦利斯卡的影响

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
S.W. Faryad , S. Mazur , J. Plomerová
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引用次数: 0

摘要

高压至超高压变质岩((U)HP)存在于波希米亚山丘和伊比利亚山丘(加利西亚-摩尔达努比亚区)之间的欧洲瓦里斯坎带,它们部分被纳入阿尔卑斯造山系统。由于(U)HP岩石涉及不同的同生单元,它们与缝合带的隶属关系并不总是很清楚,而缝合带正是它们最初被掘起的地方。波希米亚丘保留了与出露的(U)HP 岩石有明确关系的瓦利斯坎缝合带的最佳证据。它们是分别从东南和东北方向与特普拉-巴兰地块相连的莫尔达努比亚缝合线和萨克森-图林根缝合线。(U)HP岩石的分布与大尺度地震各向异性划定的地幔岩石圈域的边界相吻合,揭示了特普拉-巴兰地块下的摩尔多瓦地幔岩石圈域向西北倾斜,因此俯冲极性向西北倾斜。Teplá-Barrandian地块的东缘包含一个岩浆弧,与摩尔多瓦造山楔直接接触,两者都被灯心岩堤穿透(约 340 Ma),这表明与碰撞有关的缩短和地壳固结已经停止。然而,根据地震层析成像和各向异性模型,地幔深处的缝合线似乎是萨克森-图林根岩石圈域和特普拉-巴兰迪岩石圈域之间的次垂直边界。萨克森-图林根区的(副)自生单元具有蓝晶岩面变质作用的证据,这些单元的变质作用十分强烈。与莫尔塔努比安带相比,萨克森-图林根带的(U)HP 岩较少见,多以岩页和岩坑的形式出现,其中一些在莫尔塔努比安缝合线附近出露。萨克森-图林根(U)HP 岩与摩尔达努比亚带(U)HP 岩的相似性以及它们的同生位置有利于部分(U)HP 岩沿着摩尔达努比亚缝合线形成,并随后移位到萨克森-图林根带。它们在岩性(主要是包含在长英岩物质中的地幔岩石碎片)和花岗闪长岩面热覆盖方面都表现出相似性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Location and polarity of Variscan sutures based on petrological and seismological data from the Bohemian Massif and the implications for the European Variscides

The high- to ultrahigh-pressure ((U)HP) metamorphic rocks are present within the European Variscan belt between the Bohemian and Iberian massifs (the Galicia-Moldanubian zone) and they are partly incorporated into the Alpine orogenic system. Due to their involvement in various allochthonous units, the affiliation of the (U)HP rocks to the suture zones that were the sites of their initial exhumation, is not always clear. The Bohemian Massif preserves the best evidence of Variscan sutures with clear relationships to the exposed (U)HP rocks. They are the Moldanubian and the Saxo-Thuringian sutures bounding the Teplá-Barrandian block from the SSE and NNE, respectively. The distribution of (U)HP rocks coincides with the boundaries of mantle lithosphere domains, delimited from large-scale seismic anisotropy, and reveals the NW-ward inclination of the Moldanubian mantle lithosphere domain beneath the Teplá-Barrandian block and thus a subduction polarity to the NW. The eastern margin of the Teplá-Barrandian block contains a magmatic arc, which is in direct contact with the Moldanubian orogenic wedge, and both are penetrated by lamprophyre dykes (∼340 Ma), which dates the cessation of the collision-related shortening and crustal consolidation. The overall crustal geometry of the Saxo-Thuringian suture implies the SE-ward polarity of subduction during its formation. However, based on seismic tomography and anisotropy model, the suture at mantle depths appears as a sub-vertical boundary between the Saxo-Thuringian and the Teplá-Barrandian lithosphere domains. The Saxo-Thuringian zone bears evidence of blueschist facies metamorphism in the (para)autochthonous units, which are strongly retrogressed. Compared to the Moldanubian zone, (U)HP rocks are less common in the Saxo-Thuringian zone and occur as nappes and klippes, some of which are exposed near the Moldanubian suture. The similarities of the Saxo-Thuringian (U)HP rocks to those in the Moldanubian zone and their allochthonous positions favour formation of some of the (U)HP rocks along the Moldanubian suture and their subsequent emplacement into the Saxothuringian zone. The Moldanubian suture appears to control the distribution of most of the (U)HP rocks exposed along the European Variscan Belt. They all show similarities regarding lithology, mainly fragments of mantle rocks included in felsic materials, and their granulite-amphibolite facies thermal overprint.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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