Fault- and fracture-hosted multi-stage mineral assemblages that formed by fracture reactivation and fluid migration, constitute archives of the tectonic evolution of Precambrian cratons. Complex intergrowth patterns of these mineral records often hinder absolute dating of mineralization events for geological models. We apply LA-ICP-MS/MS in situ Rb-Sr dating of single crystal growth zones in sub-mm-wide vein mineralization assemblages including illite, K-feldspar, albite, calcite, mica, zeolites, fluorite and/or epidote at three Palaeoproterozoic crystalline bedrock sites over 300 km apart in the Fennoscandian Shield. The dating campaign reveals multiple age clusters between ca. 1757 ± 15 and 355 ± 12 Ma correlating with fluid flow and fracture reactivation events initiated by far-field orogens and their foreland basin evolution. This new approach for reconstructing geological histories of Precambrian cratons connects micro-scale age determinations of different mineral growth zones in fractures with regional-scale crustal dynamic responses to tectonic events.

中文翻译：

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通过多相脉成矿的原位Rb-Sr年代学重建克拉通尺度的构造事件

由断裂再活化和流体运移形成的断层和断层承载的多期矿物组合构成了前寒武纪克拉通构造演化的档案。这些矿物记录的复杂共生模式通常会阻碍地质模型对矿化事件的绝对测年。我们在亚毫米宽的脉矿化组合中应用 LA-ICP-MS/MS 原位 Rb-Sr 测年，包括伊利石、钾长石、钠长石、方解石、云母、沸石、萤石和/或绿帘石Fennoscandian 地盾中相距 300 多公里的三个古元古代结晶基岩遗址。约会活动揭示了大约之间的多个年龄集群。1757 ± 15 和 355 ± 12 Ma，与远场造山带及其前陆盆地演化引发的流体流动和裂缝再激活事件相关。