Implementation of an Alpha Damage Annealing Model for Zircon (U‐Th)/He Thermochronology With Comparison to a Zircon Fission Track Annealing Model
Implementation of an Alpha Damage Annealing Model for Zircon (U‐Th)/He Thermochronology With Comparison to a Zircon Fission Track Annealing Model
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锆石 (U–Th)/He 热年代学的 Alpha 损伤退火模型的实现与锆石裂变径迹退火模型的比较
DOI：
10.1029/2019gc008757
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Guenthner, William R.
中科院分区：
文献类型：
--
作者：
Guenthner, William R.
辐射损伤对He在锆石中的扩散起着根本性的控制作用，表现为（U-Th）/He年龄与有效铀浓度之间的相关性。这些相关性可以通过建模来探索长期的热历史。这份手稿集中在这样一个模型，锆石辐射损伤积累和退火模型（ZRDAAM）的Guenthner等人。（2013），https：//doi.org/10.2475/03.2013.01，通过整合由Ginster等人测量的新定义的α损伤退火动力学。（2019），https：//doi.org/10.1016/j.gca.2019.01.033，进入ZRDAAM。我探讨了这个α损伤退火模型的几个后果，因为它涉及到（U-Th）/He日期有效铀（eU）的相关性，使用代表性的时间-温度路径和以前发表的结果。比较使用裂变径迹退火的当前版本的ZRDAAM和新的退火模型表明，对于在低温（<50°C）下长时间的热历史，α剂量退火动力学在低到中等eU浓度下产生稍微年轻的模型日期，在中等到高eU浓度下产生较老的日期，在最高eU浓度下产生相当年轻的日期。在给定的热历史中，观察到差异的绝对eU浓度会发生变化，因此这些范围应被解释为相对或成比例。年轻的模型日期在高eU在大多数热历史的结果，从较低的退火量发生与Ginster等人。（2019）α剂量退火动力学。该退火模型比较表明，退火动力学的选择对热历史的模型输出具有最大影响，所述热历史涉及200-300°C温度窗口中的延长时间段或后期再加热事件。
Radiation damage exerts a fundamental control on He diffusion in zircon, which manifests as correlations between (U‐Th)/He date and effective uranium concentration. These correlations can be exploited with modeling to explore long‐term thermal histories. This manuscript focuses on one such model, the zircon radiation damage accumulation and annealing model (ZRDAAM) of Guenthner et al. (2013), https://doi.org/10.2475/03.2013.01, by integrating newly defined alpha damage annealing kinetics measured by Ginster et al. (2019), https://doi.org/10.1016/j.gca.2019.01.033, into ZRDAAM. I explore several consequences of this alpha damage annealing model as it relates to (U‐Th)/He date‐effective uranium (eU) correlations, using representative time‐temperature paths and previously published results. Comparison between the current version of ZRDAAM, which uses fission track annealing, and the new annealing model demonstrates that, for thermal histories with prolonged periods at low temperatures (<50°C), alpha dose annealing kinetics yield slightly younger model dates at low to moderate eU concentrations, older dates at moderate to high eU, and substantially younger dates at the highest eU concentrations. The absolute eU concentrations over which the differences are observed varies for a given thermal history, so these ranges should be interpreted as relative or proportional. Younger model dates at high eU in most thermal histories result from lower amounts of annealing that occur with the Ginster et al. (2019) alpha dose annealing kinetics. This annealing model comparison illustrates that the choice of annealing kinetics has the greatest influence over model output for thermal histories involving either prolonged time periods in the 200–300°C temperature window, or a late‐stage reheating event.
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