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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Inversion of thermochronological age-elevation profiles to extract independent estimates of denudation and relief history - II: Application to the French Western Alps
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Inversion of thermochronological age-elevation profiles to extract independent estimates of denudation and relief history - II: Application to the French Western Alps

机译：热年代学年龄反演以提取剥蚀和浮雕历史的独立估计值-II：在法国西阿尔卑斯山的应用

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Thermochronologic data collected along age-elevation profiles are commonly interpreted as recording temporally variant but spatially constant exhumation rates. However, thermochronologic age-elevation relationships are known to be perturbed by topographic effects and potential changes in relief, which are neglected in the inherently 1-D interpretation commonly applied. Such data thus potentially record both the denudation and relief history of the sampled region but extracting this information is challenging. In a companion paper, we develop a methodology for rigorously interpreting thermochronologic age-elevation profiles in terms of exhumation rates and relief development through time, and to independently quantify the resolution of these constraints. Here we test this approach using a thermochronological dataset consisting of apatite and zircon fission-track and (U-Th)/He data, collected at La Meije Peak in the Pelvoux-Ecrins massif (French Western Alps). Our data and models suggest a three-phase exhumation history in the Pelvoux-Ecrins massif, including a pulse of rapid exhumation at ~6-5.5Ma, preceded and followed by more moderate rates of denudation in the order of 0.3-0.4kmMyr~(-1). This rapid exhumation event appears to occur coevally in other external crystalline massifs in the Alps but is not detected by qualitative inspection of the age-elevation relationships. Both our synthetic results and inversion of the La Meije data strongly suggest that apatite fission-track age-elevation relationships alone cannot resolve both denudation and relief histories independently and that multiple thermochronometers are required. Combining apatite fission-track and (U-Th)/He ages and, particularly, including fission-track-length data greatly improves the resolution of the inferred exhumation histories. Although denudation rates through time and the timing of rate changes are generally well resolved, our data have insufficient resolution to satisfactorily constrain the relief history. Synthetic results reported in the companion paper suggest that the reason for this limitation is that relief increase through valley carving has been insufficient with respect to the regional denudation rates to be unambiguously extracted from the data.
机译：沿年龄分布轮廓收集的热年代学数据通常被解释为记录随时间变化但空间恒定的尸体发掘率。但是，众所周知，热年代学年龄与海拔的关系会受到地形效应和浮雕潜在变化的干扰，而这种变化通常在固有的一维解释中被忽略。这样的数据因此潜在地记录了采样区域的剥蚀和浮雕历史，但是提取该信息是具有挑战性的。在随附的论文中，我们开发了一种方法，可以根据发掘率和随时间推移的救济发展来严格解释热年代学年龄的高程特征，并独立地量化这些约束的解决方案。在这里，我们使用由磷灰石和锆石裂变径迹和（U-Th）/ He数据组成的热年代学数据集（在法国阿尔卑斯山的法尔沃-埃克林斯山峰La Meije峰上收集）测试了这种方法。我们的数据和模型表明，Pelvoux-Ecrins地块有3个阶段的掘尸史，包括在〜6-5.5Ma处快速掘尸的脉冲，在此之前和之后以0.3-0.4kmMyr〜（数量级）的适度剥蚀率-1）。这种快速发掘的事件似乎在阿尔卑斯山的其他外部晶体地块中明显发生，但没有通过年龄-年龄关系的定性检查发现。我们的综合结果和La Meije数据的反演都强烈表明，仅磷灰石裂变径迹的年龄与年龄的关系无法独立解决剥蚀史和浮雕史，因此需要使用多个温度计时器。结合磷灰石裂变径迹和（U-Th）/ He年龄，尤其是包括裂变径迹长度数据，可以极大地提高推断出的掘尸史的分辨率。尽管通常可以很好地解决随时间变化的剥蚀率和时间变化的时机，但我们的数据没有足够的分辨率来令人满意地约束救济历史。随同论文中报告的综合结果表明，这种局限性的原因是，通过山谷雕刻增加的浮雕不足以明确从数据中明确提取的区域剥蚀率。

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