Recognition of impact‐induced deformation of minerals is crucial for the identification and confirmation of impact structures as well as for the understanding of shock wave behavior and crater formation. Shock deformed mineral grains from impact structures can also serve as important geochronometers, precisely dating the impact event. We investigated zircon grains from the Mien impact structure in southern Sweden with the aim of characterizing shock deformation. The grains were found in two samples of impact melt rock with varying clast content, and in one sample of suevitic breccia. We report the first documentation of so‐called “FRIGN zircon” (former reidite in granular neoblastic zircon) from Mien (pre‐erosion diameter 9 km), which confirms that this is an important impact signature also in relatively small impact structures. Furthermore, the majority of investigated zircon grains contain other shock‐related microtextures, most notably granular and microporous textures, that occur more frequently in grains found in the impact melt than in the suevitic breccia. Our findings show that zircon grains that are prime candidates for establishing a new and improved age refinement of the Mien impact structure are present in the impact melt.

中文翻译：

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瑞典Mien撞击结构中锆石颗粒的冲击变形

识别冲击引起的矿物变形对于识别和确认冲击结构以及理解冲击波行为和陨石坑形成至关重要。冲击结构产生的冲击变形的矿物颗粒也可以用作重要的地球计时器，精确地记录了冲击事件的发生。我们研究了瑞典南部Mien冲击结构中的锆石晶粒，目的是表征冲击变形。在两个具有不同碎屑含量的冲击熔岩样品和一个易溶角砾岩样品中发现了这种颗粒。我们报道了Mien（侵蚀前直径9 km）所谓的“ FRIGN锆石”（粒状成新锆石中的前残留物）的第一份文献，这证实了这也是在相对较小的冲击结构中的重要冲击特征。此外，大多数研究过的锆石晶粒还包含其他与冲击有关的微织构，最明显的是颗粒状和微孔织构，它们在冲击熔体中的晶粒中比在角砾岩中更常见。我们的发现表明，在熔体中存在锆石晶粒，它们是建立Mien冲击结构新的和改进的年龄细化的主要候选材料。