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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 >Ongoing exhumation of the Taiwan orogenic wedge revealed by detrital apatite thermochronology: The impact of effective mineral fertility and zero-track grains
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Ongoing exhumation of the Taiwan orogenic wedge revealed by detrital apatite thermochronology: The impact of effective mineral fertility and zero-track grains

机译：脱脂磷灰石热量揭示的台湾造山楔的持续挖掘：有效的矿物生育和零轨谷物的影响

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In clastic detritus derived from the erosion of young active orogens, the geologic interpretation of apatite fission-track (AFT) data is hampered by the occurrence of grains without spontaneous tracks and by contributions from multiple eroding sources with different apatite fertilities. Here, we use the Taiwan orogen as a test case to illustrate how to overcome these problems and deal with zero-track grains in detrital AFT studies following long-established principles of fission-track statistics. Our results support the effectiveness of Raman spectroscopy for a reliable identification of apatite grains. We found that zero-track grains are dominant in Taiwan modern sands, and generally contain enough U to provide useful AFT age constraints to exhumation. The absence of spontaneous tracks in most of these grains is due to a short residence time below the temperature of total AFT annealing rather than to low U concentration. Detrital AFT data shows that the extent of the Taiwan AFT reset zone previously inferred from bedrock data was partly underestimated. The revised AFT reset zone includes the southernmost part of the island and, when combined with published ZFT data, supports a scenario of southward progressing exhumation during arc-continent collision. The application of the Taiwan lesson to clastic detritus derived from the Himalaya resolves paradoxical interpretations of detrital fission-track data sets recently published in the framework of IODP Expedition 354, pointing to a major role of the Namche Barwa syntaxis as a source of apatite grains shed to the Bengal Fan. (C) 2020 Elsevier B.V. All rights reserved.
机译：在凝乳碎屑中衍生自年轻活性Origens的侵蚀，磷灰石裂变轨道（AFT）数据的地质解释被谷物出现而没有自发轨道的发生，并且来自多种侵蚀来源具有不同的磷灰石威力的贡献。在这里，我们使用台湾orenogen作为测试用例，以说明如何在裂变轨道统计的长期稳定原则之后克服这些问题并处理脱轨AFT研究中的零轨谷物。我们的研究结果支持拉曼光谱学的有效性，以可靠地识别磷灰石谷物。我们发现零轨谷物在台湾现代沙滩上占主导地位，通常含有足够的U来提供有用的后龄约束来挖掘。在大多数这些晶粒中没有自发轨道是由于低置时间低于总尾退火的温度而不是低U浓度。纠纷AFT数据表明，从基岩数据推断的台湾AFT复位区的范围部分低估了。修订后的AFT重置区域包括岛的最南端，当与已发表的ZFT数据相结合时，在弧形碰撞期间支持南方进步挖掘的场景。台湾课程从喜马拉雅队的克拉特碎屑的应用解决了最近发表在IoDP探险队框架的争议裂变轨迹数据集的矛盾解释，指出了Namche Barwa Syntaxis作为磷灰石谷物源的主要作用到孟加拉邦。 （c）2020 Elsevier B.v.保留所有权利。

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