Evolution of a shear zone before, during and after melting

Evolution of a shear zone before, during and after melting
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熔化前、熔化中和熔化后剪切带的演变

DOI:
10.1144/jgs2019-114
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发表时间:
2020
影响因子:
2.7
通讯作者:
Lee A
Lee A
中科院分区:
地球科学2区
文献类型:
--
作者:
Lee A

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变形中的中、下陆壳部分熔融导致强度降低,并促使岩性非均质性的形成。然而,同熔融变形区的形成机制和部分熔融岩石中的应变分配仍然知之甚少。我们使用现场和显微结构的观察,解开部分熔融剪切带的演变,Seiland火成岩省,北方挪威。该Reksfjord剪切带(REKSZ)是几个副片麻岩剪切带内的辉长岩的Seiland火成岩省,形成同侵入深地壳剪切在岩石圈伸展大陆裂谷。显微结构从不同的变形条件下的BSSZ显示的证据。第一阶段是活跃的预熔,并涉及在高subsolidus温度变形。这是其次由顺熔体变形的剪切区,导致相对强度增加后结晶向剪切区中心。第三阶段成核两个平行的剪切带在边缘的BISZ的熔体织构是不存在的,显微结构表明在较低的温度和较高的应力变形。实际上,熔体向剪切带中心的迁移最终导致剪切带核心的强化,结晶后变形集中于沿着存在显著不均匀性的剪切带边缘。补充材料:显示晶界二面角数据的图、EBSD图、粒度分布和其他极图可在https://doi.org/10.6084/m9.figshare.c.4819494上获得
Partial melt in the deforming mid- or lower continental crust causes a strength decrease and drives formation of lithological heterogeneities. However, mechanisms of formation of syn-melt deformation zones and strain partitioning in partially molten rock remain poorly understood. We use field and microstructural observations to unravel the evolution of a partial melt shear zone, Seiland Igneous Province, northern Norway. The Øksfjord shear zone (ØSZ) is one of several paragneiss shear zones present within gabbros of the Seiland Igneous Province, formed by syn-intrusive deep crustal shearing during lithospheric extension related to continental rifting. Microstructures from the ØSZ show evidence for different deformation conditions. The first phase was active pre-melt and involved deformation at high subsolidus temperatures. This was followed by syn-melt deformation of the shear zone causing a relative strength increase towards the shear zone centre upon crystallization. The third phase nucleated two parallel shear zones at the edges of the ØSZ; melt textures are absent and microstructures indicate deformation at lower temperatures and higher stresses. In effect, melt migration towards the shear zone centre ultimately led to strengthening of the shear zone core, with post-crystallization deformation focusing along shear zone margins where significant heterogeneities are present.Supplementary material:Figures illustrating grain boundary dihedral angle data, EBSD maps, grain size distribution and additional pole figures is available at https://doi.org/10.6084/m9.figshare.c.4819494
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