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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 >Quantitative resolution of the debate over antiquity of the central Australian landscape: implications for the tectonic and geomorphic stability of cratonic interiors
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Quantitative resolution of the debate over antiquity of the central Australian landscape: implications for the tectonic and geomorphic stability of cratonic interiors

机译：关于澳大利亚中部地区古代景观的辩论的定量解决：对克拉通内部构造和地貌稳定性的影响

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摘要

We report the first measure of long- (～100 Myr) and short- (～1 Myr) term denudation rates from key geologically stable landforms in the Davenport Range, central Australia. These landforms have previously been assigned a Cambrian age, which arguably places them amongst the oldest persistent landforms on the continent, if not on Earth. Our results from combined apatite fission track thermochronology and in situ cosmogenic radionuclide analyses using ~(10)Be and ~(26)Al show that while average exhumation rates are low, the denudation history for this cratonic region is incompatible with extreme, sub-aerial longevity and long-term tectonic and geomorphic stability. Our revised model for the landscape evolution of this region is consistent with one of maximum burial prior to and during the Mesozoic, followed by a phase of kilometre-scale exhumation that was largely complete by the beginning of the Cainozoic. We suggest that a similar process of burial and exhumation has probably been responsible for the sub-aerial preservation of seemingly ancient landforms elsewhere in Australia.
机译：我们报告了澳大利亚中部达文波特山脉主要地质稳定地貌的第一个长期（〜100 Myr）和短期（〜1 Myr）剥蚀率的度量。这些地貌以前曾被赋予寒武纪年龄，可以说是地球上最古老的持久地貌之一，即使不是在地球上。我们结合〜（10）Be和〜（26）Al进行的磷灰石裂变径迹热年代学和原位宇宙成因放射性核素分析的结果表明，虽然平均发掘出率低，但该克拉通地区的剥蚀历史与极端的亚空中不兼容长寿以及长期的构造和地貌稳定性。我们对该地区景观演化的修订模型与中生代之前和期间的最大埋葬之一相符，随后是千公里的掘尸阶段，该阶段在新生代开始之前已基本完成。我们认为，类似的埋葬和掘尸过程可能是对澳大利亚其他地方貌似古老的地貌进行了空中保护。

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