The results of 40Ar/39Ar dating of pseudotachylytes, first identified in the Paleoproterozoic zonally metamorphosed (greenschist to granulite facies) Ladoga complex of svecofennides, are presented. A wide age range of the formation of pseudotachylytes in the Riphean (1.59–1.31 Ga), presumably caused by the exhumation of deep rocks during the Svecofennian tectonogenesis and the subsequent orogenesis and riftogenesis in southeastern Fennoscandia, has been established.

中文翻译：

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Fennoscandia古元古代拉多加带状变质杂岩中假性酸液的首次发现及其40Ar/39Ar年代测定

介绍了 svecofennides 的古元古代带状变质（绿片岩到麻粒岩相）Ladoga 复合体中首次发现的拟速溶物的 40Ar/39Ar 测年结果。已经确定了 Riphean (1.59-1.31 Ga) 中拟速凝岩形成的广泛年龄范围，这可能是由 Svecofennian 构造作用期间深部岩石的挖掘以及随后 Fennoscandia 东南部的造山作用和裂谷作用引起的。