Characterization of helium release from apatite by continuous ramped heating
Characterization of helium release from apatite by continuous ramped heating
复制标题
通过连续斜坡加热表征磷灰石释放的氦气
DOI：
10.1016/j.chemgeo.2017.11.019
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
McDannell, Kalin T
中科院分区：
文献类型：
--
作者：
Idleman, Bruce D;Zeitler, Peter K;McDannell, Kalin T
对磷灰石和其他含U和含th矿物中He的动力学行为的了解主要来自详细的阶梯加热实验，然而这种实验非常耗时，并且在使用U- th /He方法的常规热年代学研究中很少进行。我们提出了一种测量磷灰石中He丰度和He释放动力学的新分析方法。利用该方法，在静态真空条件下，通过连续加热，使用升温程序从样品中提取氦，并在提取系统中周期性地测量逐渐积累的氦。连续升温（CRH）实验可以使用大多数稀有气体热年表实验室中可用的仪器进行，但需要特别注意温度控制、测量线性和动态范围，以及与He共同演化的活性气体的抑制。CRH实验只需要比传统的单步加热测量多一点的时间，但却能得到传统方法所不能提供的He释放的详细记录。杜兰戈磷灰石中He扩散的动力学参数由连续加热数据得到，与已发表的阶梯加热研究结果一致。从CRH实验中获得的He释放的连续记录也提供了关于He的定位和多种He组分在磷灰石中的存在的重要信息，其中一些可能是造成U-Th/He异常年龄和高年龄弥散的原因。因此，CRH方法有望成为磷灰石U-Th/He热年代学的有用样品筛选工具。
Knowledge of the kinetic behavior of He in apatite and other U- and Th-bearing minerals comes largely from detailed step-heating experiments, yet such experiments are time consuming and are rarely performed during routine thermochronological studies using the U-Th/He method. We propose a new analytical method for measuring both the bulk4He abundance and the kinetics of He release in apatite. Using this method He is extracted from samples by continuous heating using a ramped temperature schedule under static vacuum conditions, and the evolved He is measured periodically as it accumulates in the extraction system. Continuous ramped heating (CRH) experiments can be conducted using instrumentation available in most noble-gas thermochronology labs but require particular attention to temperature control, measurement linearity and dynamic range, and suppression of active gases co-evolved with He. CRH experiments require little more time than conventional single-step heating measurements but yield a detailed record of He release not provided by conventional methods. Kinetic parameters for He diffusion in Durango apatite derived from continuous heating data agree well with those obtained from published step-heating studies. The continuous record of He release obtained from CRH experiments also provides important information about the siting of He and the presence of multiple He components in apatite, some of which may be responsible for anomalous U-Th/He ages and high age dispersion. As such the CRH method shows promise as a useful sample screening tool for apatite U-Th/He thermochronology.
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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