【摘要】 在利用磷灰石裂变径迹热年代学方法来约束岩体冷却史的应用中,由于地质条件和磷灰石退火性质的限制,表观年龄往往不能直接代表特定地质事件的时间.利用封闭径迹的长度直方图模式和高程-年龄模式可定性地反映出岩体冷却史是否遭受过干扰.平均径迹长度-年龄(或香蕉图)模式、径迹年龄谱模式以及反演模拟在某种程度上可用来限定地质过程中冷却启动的时间.然而,对于多阶段的冷却史,模式和模拟分析的不确定性仍较显著,对早期时限的定量揭示仍是研究和应用中的一个难点.只有结合多种方法、模式和模拟的运用并考虑地质背景才能较清晰地约束岩体的冷却历史.更多还原

【Abstract】 As using apatite fission track thermochronology to constrain the cooling histories of rocks,it is constrained by geological settings and natures of apatite fission track annealing that the apparent ages of apatites are generally not proxies for the time of specific geological events directly.Using the confined track length histogram and elevation-age mode can qualitatively reflect whether the cooling history of batholith has undergone some disturbances.Mean track length-age mode(or boomerang plot),track age spectrum mode and inverse modeling can constrain the onset time of discrete cooling histories to some extent.However,when to analyze the multi-episode cooling histories recorded by apatite fission track,the uncertainties in these modes and modeling are still remarkable that a difficulty on research is to qualify the time of the earlier episode of cooling histories.To constrain the cooling histories of rocks clearly,it is necessary to combine various methods,modes and modeling results together with a consideration about geological settings.更多还原