The poly‐deformed Georgetown Inlier (GTI) in NE Australia has recently been suggested to record a 1.60 Ga orogenic event related to final Nuna assembly. However, the structural evolution of the inlier has remained poorly constrained at the regional scale, and major tectono‐thermal events occurred at circa 1.55 Ga. The GTI is the type region for conceptualization of crenulation cleavage development and where the foliation intersection axes (FIAs) approach has been applied. We reevaluated both concepts by combining a multiscale petrostructural analysis with recent petrological and geochronological data. Three main deformation events (D1–D3) and associated composite fabrics (S1–S3) are identified in the GTI. The original NE orientation of 1.60 Ga D1 compressional structures is preserved in the low‐grade western domain, and the associated composite S1 fabric is retained as microstructural relicts within circa 1.55 Ga D2 low‐strain domains to the east. Extensional D2 structures, characterized by a pervasive, high‐grade, composite S2 foliation throughout the central and eastern domains, are interpreted as the footwall of a regional N‐S trending, W dipping crustal‐scale detachment zone. Syn‐D2 S‐type granites formed at 1.55 Ga as the detachment evolved. D1 stage was associated with Nuna assembly, whereas D2 represents postcollisional extension. Progressive foliation development occurred twice in the GTI, at 1.60 (D1) and 1.55 Ga (D2), but the previous FIA analysis only records the 1.60 Ga event and cannot be easily reconciled with the regional structural analysis. This study highlights that a multiscale and multidisciplinary approach is required to unravel the structural history of orogenic belts.

中文翻译：

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与超大陆努纳的最终大会有关的1.6 Ga造山运动的结构演化：偶发与渐进形变的耦合

最近建议澳大利亚东北部的多变形乔治敦内里尔（GTI）记录与努纳最终组装有关的1.60 Ga造山事件。但是，在区域范围内，该内陆地区的结构演化仍然受到限制，并且主要的构造-热事件发生在大约1.55 Ga处。GTI是概念化环纹卵裂发育和叶相交轴（FIA）的类型区域。方法已被应用。我们通过将多尺度的岩石结构分析与最新的岩石学和年代学数据相结合，重新评估了这两个概念。在GTI中确定了三个主要变形事件（D1-D3）和相关的复合织物（S1-S3）。1.60 Ga D1压缩结构的原始NE取向保留在低品位的西部区域，并且相关的复合材料S1织物作为微结构遗迹保留在东部约1.55 Ga D2低应变域内。D2伸展构造的特征是遍及中部和东部的无处不在的高品位复合S2叶片，被解释为区域N-S趋势，W浸入地壳规模脱离带的下盘。随着分离的发展，Syn-D2 S型花岗岩形成于1.55 Ga。D1阶段与Nuna装配相关，而D2代表碰撞后扩展。GTI进行了两次渐进的叶发育，分别为1.60（D1）和1.55 Ga（D2），但先前的FIA分析仅记录了1.60 Ga事件，无法轻易与区域结构分析保持一致。