The Connecticut Valley–Gaspé (CVG) trough represents a major, orogen‐scale Silurian–Devonian basin of the Northern Appalachians. From Gaspé Peninsula to southern New England, the CVG trough has experienced a contrasting metamorphic and structural evolution during the Acadian orogeny. Along its strike, the CVG trough is characterized by increasing strain and polyphase structures, and by variations in the intensity of regional metamorphism and contrasting abundance of c. 390–370 Ma granitic intrusions. In southern Quebec and northern Vermont, a series of NW–SE transects across the CVG trough have been studied in order to better understand these along‐strike variations. Detailed structural analyses, combined with phase equilibria modelling, Raman spectrometry, and muscovite ⁴⁰Ar/³⁹Ar dating highlight a progressive and incremental deformation involving south–north variation in the timing of metamorphism. Deformation evolves from a D₁ crustal thickening event which originates in Vermont and progresses to southern Québec where it peaked at 0.6 GPa/380°C at c. 375 Ma. This was followed by a D₂ event associated with continuous burial in Vermont from 378 to 355 Ma, which produced peak metamorphic conditions of 0.85 GPa/380°C and exhumation in Quebec from 368 to 360 Ma. The D₃ compressional exhumation event also evolved from south to north from 345 to 335 Ma. D₁ to D₃ deformation events form part of a continuum with an along‐strike propagation rate of ~50 km/Ma During D₁, the burial depth varied by more than 15 km between southern Quebec and Vermont, and this can be attributed to the occurrence of a major crustal indenter, the Bronson Hill Arc massif, in the New England segment of the Acadian collision zone.

中文翻译：

---

北阿巴拉契亚康涅狄格河谷-加斯佩海槽的历时变质和结构演化

康涅狄格谷-加斯佩（CVG）槽代表了北部阿巴拉契亚山脉一个重要的造山带规模志留统-德文统盆地。从加斯佩半岛到新英格兰南部，CVG槽在阿卡迪亚造山运动中经历了相反的变质和结构演化。沿着它的走向，CVG槽的特征在于应变和多相结构的增加，区域变质作用强度的变化和c的相对丰度。390–370 Ma花岗岩侵入体。在魁北克南部和佛蒙特州北部，研究了横跨CVG槽的一系列NW-SE横断面，以便更好地理解这些沿袭的变化。详细的结构分析，结合相平衡建模，拉曼光谱和白云母⁴⁰ Ar /³⁹ Ar测年显示了变质时期南北向变化的渐进和渐进变形。变形是从D ₁地壳增厚事件演变而来的，该事件起源于佛蒙特州，并发展到魁北克南部，在c达到0.6 GPa / 380°C的峰值。375毫安。随后发生的D ₂事件与佛蒙特州从378至355 Ma的连续埋葬有关，这产生了0.85 GPa / 380°C的峰值变质条件，魁北克的遗骸从368至360 Ma发生了发掘。D ₃压缩发掘事件也从345 Ma到335 Ma从南向北演化。D ₁至D ₃D ₁期间，魁北克南部和佛蒙特州之间的埋藏深度变化超过15 km，形变事件形成了一个连续波的一部分，走向传播速率约为〜50 km / Ma。位于阿卡迪亚碰撞带新英格兰地区的地壳压头Bronson Hill Arc地块。