Abstract Ediacaran convergence and collision resulting from amalgamation of West Gondwana are documented in the Borborema Province by high-pressure rock units, contractional tectonics and anatexis. Thermochronological (zircon U-Pb and amphibole-biotite Ar-Ar) and structural (Anisotropy of Magnetic Susceptibility) constraints from shear zone-bounding synkinematic plutons in the Ceara Central Domain provide timing and rates of their subsequent post-collisional evolution. Our results show that: (i) U-Pb ages of zircons of 585–571 Ma record magma crystallisation and a protracted history of assembly for the Taua batholith, synchronous with deformation in the bounding transcurrent shear zone junction; (ii) AMS fabrics document chamber construction processes and the effect of long-lived strongly localized shear zone deformation; and (iii) 40 Ar/ 39 Ar plateau ages of amphibole and biotite from the synkinematic plutons at 577–562 and 559–554 Ma, respectively, yield cooling rates of 20–40 ° C/Myr characterising differential cooling paths. Integration of various thermochronometers available for the strike-slip shear zones and the internal high-pressure domain reveals a fast isothermal decompression (long-term unroofing rate of 1.9–5.8 mm/yr), which exhumed high-pressure rock units. Subsequently, fast nearly isobaric cooling (20–40 ° C/Myr) occurred in the whole terrane until 590 Ma, with temperatures falling below 320 ° C. Due to enhanced magmatic activity during the deformation, the shear zones experienced much higher temperatures at that same depth at 584 Ma followed by fast cooling (20–40 ° C/Myr) to temperatures below 320 ° C at 560 Ma. These final cooling episodes were accompanied by slow unroofing at an estimated rate of 0.3–0.9 mm/yr, sufficient to bring these rocks close to the surface at 540 Ma, when molassic, pull-apart basins were formed.

中文翻译：

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同运动岩体的剪切带冷却和结构证明了西北部 Borborema 省（巴西东北部）造山剥落的时间和速率

摘要 在 Borborema 省，高压岩石单元、收缩构造和 anatexis 记录了西冈瓦纳河合并导致的埃迪卡拉纪辐合和碰撞。来自 Ceara 中心域中剪切带边界同运动岩体的热年代学（锆石 U-Pb 和角闪石-黑云母 Ar-Ar）和结构（磁化率各向异性）约束提供了它们随后碰撞后演化的时间和速率。我们的结果表明： (i) 585-571 Ma 锆石的 U-Pb 年龄记录了岩浆结晶和 Taua 基岩的长期组装历史，与边界横流剪切带交界处的变形同步；(ii) AMS 织物记录了腔体建造过程和长期强局部剪切区变形的影响；(iii) 来自同运动岩体的角闪石和黑云母的 40 Ar/ 39 Ar 高原年龄分别为 577-562 和 559-554 Ma，冷却速率为 20-40°C/Myr，表征了不同的冷却路径。可用于走滑剪切带和内部高压域的各种温度计的集成显示出快速等温减压（1.9-5.8 毫米/年的长期开顶率），从而挖掘出高压岩石单元。随后，整个地体发生近等压的快速冷却（20-40°C/Myr），直到 590 Ma，温度降至 320°C 以下。由于变形过程中岩浆活动增强，剪切带在该处经历了更高的温度584 Ma 时的相同深度，然后在 560 Ma 时快速冷却 (20–40 °C/Myr) 至低于 320 °C 的温度。