We present the first fission‐track results from the Grenvillian Oaxacan Complex, southern Mexico. Time–temperature modelling of the data indicates that two significant Mesozoic cooling episodes are recorded in the Oaxacan Complex and these are interpreted as resulting from exhumation. The older cooling event took place from the Late Triassic to Middle Jurassic and is possible linked to the break‐up of Pangea (including the initial opening of the Gulf of Mexico during the Jurassic). The younger exhumation period in the Early Cretaceous is contemporaneous with the final stages of rifting of the Gulf of Mexico. Key stratigraphic records also provide independent evidence for these exhumation episodes. In our view, both Mesozoic rapid exhumation events were controlled by the activity of the Caltepec Fault Zone and the Oaxaca Fault. Our data suggest that both these large fault systems have remained active since, at least, the Late Triassic.

中文翻译：

---

墨西哥南部格伦维尔人瓦哈坎综合体的中生代发掘史

我们展示了墨西哥南部格伦维利安·瓦哈卡坎联合体的第一个裂变径迹结果。数据的时间-温度模型表明，瓦哈坎复合体中记录了两个明显的中生代冷却事件，这些事件被解释为是发掘出土造成的。较早的降温事件发生在三叠纪晚期至侏罗纪中期，可能与Pangea的破裂有关（包括侏罗纪期间墨西哥湾的首次开放）。白垩纪早期的掘尸时期与墨西哥湾裂谷的最后阶段是同时期的。关键的地层记录也为这些掘尸事件提供了独立的证据。我们认为，这两个中生代快速发掘事件都受卡尔特佩克断层带和瓦哈卡断层的活动控制。