Knowledge of the Guiana Shield evolution during the Gondwana break-up is key to a better understanding of craton dynamics and margin response to transtensional opening. To improve this knowledge, we investigated the dynamics and thermal evolution of French Guiana, using several low-temperature thermochronology methods applied to basement rocks, including apatite and zircon (U-Th)/He and apatite fission tracks. Inverse modelling of results allows us to reconstruct the Phanerozoic thermal history of French Guiana margin and to give a preview of the Guiana Shield evolution. Three main events are inferred: firstly, a long-term period of relative stability since ~1.2 Ga, with no strong evidence for any erosional or burial event (>5–7 km); secondly, a heating phase between ~210 and ~140 Ma consistent with the Central Atlantic Magmatic Province-related event. Finally, an exhumation phase between ~140 and ~90 Ma, triggered by the Equatorial Atlantic opening, brought samples close to the surface (<40°C).

中文翻译：

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法属圭亚那利润率演变：从冈瓦纳解体到大西洋开盘

了解冈瓦纳断裂期间圭亚那地盾演化是更好地了解克拉通动力学和对张开张开的边缘响应的关键。为了提高这些知识，我们使用几种应用于基岩的低温热年代学方法研究了法属圭亚那的动力学和热演化，包括磷灰石和锆石 (U-Th)/He 和磷灰石裂变轨迹。结果的逆向建模使我们能够重建法属圭亚那边缘的显生宙热史，并预览圭亚那地盾演化。推断出三个主要事件：首先，自~1.2 Ga 以来的长期相对稳定时期，没有任何侵蚀或埋藏事件的有力证据（> 5-7 公里）；第二，与中大西洋岩浆省相关事件一致的~210 到~140 Ma 之间的加热阶段。最后，由赤道大西洋开口引发的约 140 至约 90 Ma 的剥落阶段使样品靠近地表（<40°C）。