The Cenozoic unconformity above the Late Cretaceous carbonates within the Maverick Basin is a unique feature of Texas (USA). Hypotheses accounting for the unconformity include (1) Cenozoic sediment bypass, and (2) ~6400 m of erosion during the Laramide orogeny. Both hypotheses have different implications for the burial history of the Eagle Ford Group (EFG) and for our understanding of the Laramide orogeny. We generated clumped isotope data and organic maturation proxies from the same location. Carbonate clumped isotope temperatures obtained (113 ± 9 °C) represent recrystallization during burial and a minimum estimate of the maximum burial temperature. This constraint is significantly warmer than apparent organic temperatures derived using an Arrhenius equation (40–55 °C). Organic matter transformation and carbonate recrystallization respond to temperature over different time scales and therefore capture snapshots of the thermal history particular to the chemical reactions that control the respective processes. Using numerical forward modeling on the combination of two different temperature proxies, we derived a new hypothesis: ~2800 m of Cenozoic sediments were accumulated and then eroded during late Laramide compression. This is significantly less erosion than previous estimates, indicating the impact of the Laramide orogeny in the basin may have been less severe than previously thought.

中文翻译：

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新生代沉积物旁路与 Eagle Ford 群的 Laramide 折返和侵蚀：有机和无机代理数据建模的视角（美国德克萨斯州特立独行盆地）

Maverick 盆地内晚白垩世碳酸盐岩上方的新生代不整合面是美国德克萨斯州的一个独特特征。解释不整合面的假设包括（1）新生代沉积物旁路，和（2）Laramide造山运动期间约6400 m的侵蚀。这两种假设对鹰福特群 (EFG) 的埋葬历史和我们对拉拉米德造山运动的理解都有不同的影响。我们从同一位置生成了聚集同位素数据和有机成熟代理。获得的碳酸盐聚集同位素温度 (113 ± 9 °C) 代表了掩埋过程中的再结晶和最高掩埋温度的最低估计值。该约束条件明显高于使用 Arrhenius 方程 (40–55 °C) 得出的表观有机温度。有机物转化和碳酸盐重结晶对不同时间尺度的温度作出反应，因此可以捕捉到控制各个过程的化学反应所特有的热历史快照。使用对两种不同温度代理组合的数值正演模拟，我们得出了一个新假设：约 2800 米的新生代沉积物在拉拉米德晚期压缩过程中积累然后被侵蚀。这比以前的估计要小得多，表明拉拉米造山运动对盆地的影响可能没有以前想象的那么严重。使用对两种不同温度代理组合的数值正演模拟，我们得出了一个新假设：约 2800 米的新生代沉积物在拉拉米德晚期压缩过程中积累然后被侵蚀。这比以前的估计要小得多，表明拉拉米造山运动对盆地的影响可能没有以前想象的那么严重。使用对两种不同温度代理组合的数值正演模拟，我们得出了一个新假设：约 2800 米的新生代沉积物在拉拉米德晚期压缩过程中积累然后被侵蚀。这比以前的估计要小得多，表明拉拉米造山运动对盆地的影响可能没有以前想象的那么严重。