Mesozoic–Tertiary exhumation history of the Altai Mountains, northern Xinjiang, China: New constraints from apatite fission track data
Mesozoic–Tertiary exhumation history of the Altai Mountains, northern Xinjiang, China: New constraints from apatite fission track data
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DOI：
10.1016/j.tecto.2005.09.007
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发表时间：
2006-01
期刊：
影响因子：
2.9
通讯作者：
W. Yuan;A. Carter;Jinquan Dong;Zengkuan Bao;Y. An;Zhaojie Guo
中科院分区：
文献类型：
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作者：
W. Yuan;A. Carter;Jinquan Dong;Zengkuan Bao;Y. An;Zhaojie Guo
本研究利用磷灰石裂变径迹（FT）分析方法，对采自中国新疆北方阿尔泰山的基岩样品的折返历史进行了约束。样品是作为与古生代地壳增生事件有关的主要构造的断面收集的。FT结果和建模确定了三个阶段的样品冷却历史跨越中生代和第三纪。第一阶段记录了快速冷却到裂变径迹部分退火区的低温部分，约70±10 °C。第二阶段，记录了一段相对稳定的时期，在2075年至2025 -20年期间几乎没有冷却，这表明阿尔泰地区已经减少到低海拔地区。支持这一点的证据可以在邻近的准噶尔盆地找到，在此期间，该盆地几乎没有沉积物。最后阶段的冷却发生在中新世，以加速的速度将采样的岩石带到地球表面。这最后一个阶段，与喜马拉雅碰撞的远场效应有关，很可能产生了地表隆起和起伏，形成了今天的阿尔泰山。
This study uses apatite fission track (FT) analysis to constrain the exhumation history of bedrock samples collected from the Altai Mountains in northern Xinjiang, China. Samples were collected as transects across the main structures related to Palaeozoic crustal accretion events. FT results and modeling identify three stages in sample cooling history spanning the Mesozoic and Tertiary. Stage one records rapid cooling to the low temperature part of the fission track partial annealing zone circa 70±10 °C. Stage two, records a period of relative stability with little if any cooling taking place between ∼75 and ∼25–20 Ma suggesting the Altai region had been reduced to an area of low relief. Support for this can be found in the adjacent Junngar Basin that received little if any sediment during this interval. Final stage cooling took place in the Miocene at an accelerated rate bringing the sampled rocks to the Earth's surface. This last stage, linked to the far field effects of the Himalayan collision, most likely generated the surface uplift and relief that define the present-day Altai Mountains.