Apatite fission track, apatite U-Pb, and electron microprobe data from Rae craton, Canada

Data supporting two samples are provided in this repository and files herein contain AFT age and length data, U-Pb apatite data, and electron microprobe (EPMA) data (in oxide weight % and apfu) from the Rae craton, Canadian Shield, Canada.

Sample 11JP322B (aka z10907, GSC geochronology lab #, or GeoSep Services (GSS) internal sample number: 334-03) and 14NK-C062 (GSS: 248-15) dated via the LA-ICP-MS apatite fission track method. Files also include age/length grain spatial locations for matching replicate age/length grain EPMA analyses. Refer to http://dx.doi.org/10.17632/wwrkpr9gcx.5 for additional information.

Note: sample z10907/11JP322B was dated in two separate aliquots from project 334 and later project 390. The latter project underwent an "age-length pairing" (ALP) procedure where lengths were only measured from grains counted for age. These grains were then probed twice directly, once in/near the laser ablation spot area from AFT analysis, and once on another distal spot on the grain to assess the potential for isotopic zonation. In the length data tab for the ALP sample, the grain # corresponds to (for example) grain 1 with tracks 1 to 5 belonging to that grain, i.e., age grain 1. Therefore each age grain has a corresponding date and N number of tracks directly associated with it. This approach negates the need for grain locations to be recorded.

The supplementary data files are Microsoft Excel .xlsx format and contained in a compressed .zip folder with a directory structure and contents as follows:

Folder “Raw-AFT-UPb” contains the raw LA-ICP-MS apatite fission track age and length data.
The raw apatite U-Pb age data, blanks, corrections, etc. are also included in a separate sheet tab for each sample. All AFT samples are referred to by their analytical number, e.g. 334-03 and their sample number z10907 (11JP322B). For all other data in the “EPMA” and “Grain-Locations” folders each grain is referred to by analytical number only, and whether it is an age or length grain. Folder “EPMA” contains the electron microprobe data with the OH estimation included in weight percent oxide or atom per formula unit format. These data can be converted to apfu and their respective rmr0 values determined using either the Carlson et al. (1999) or Ketcham et al. (2007) equations (see main text for details).

Folder “Grain-Locations” contains the x,y coordinates for each age and length grain that was probed for each sample. The grains are flagged if they are duplicate measurements, i.e. the EPMA measurement for age grain 1 is also the same measurement for length grain 15. This is determined by distance of 0 to 10 microns (green) and 10 to 50 microns (orange).

HeFTy model (Ketcham, 2005) input files with float values for all AFT data, e.g. Ns, A, Pcorr, error, U, Dpar, etc. are also included in the "HeFTyFiles" folder. Interpreted files for multikinetic modeling also provided.

本仓库提供了支持两个样本的数据，其中包含来自加拿大盾牌地区雷伊克拉通地区的 AFT 年龄和长度数据、U-Pb 钙磷灰石数据，以及电子探针（EPMA）数据（以氧化物重量百分比和apfu为单位）。样本11JP322B（又称z10907，GSC地质年代学实验室编号，或GeoSep Services（GSS）内部样本编号：334-03）和14NK-C062（GSS：248-15）通过LA-ICP-MS钙磷灰石裂变径迹方法进行定年。文件还包括年龄/长度颗粒空间位置，以匹配复制的年龄/长度颗粒EPMA分析。有关更多信息，请参阅http://dx.doi.org/10.17632/wwrkpr9gcx.5。

注意：样本z10907/11JP322B在项目334和后续项目390中分别进行了两次取样。后者项目经历了“年龄-长度配对”（ALP）程序，其中仅从用于年龄计数的颗粒中测量长度。这些颗粒随后直接进行了两次探针分析，一次是在激光剥蚀点区域进行AFT分析，另一次是在颗粒的另一个远端点进行，以评估同位素分带的可能性。在ALP样本的长度数据标签中，颗粒编号对应于（例如）颗粒1，其中轨迹1至5属于该颗粒，即年龄颗粒1。因此，每个年龄颗粒都有一个相应的日期和与它直接相关的N条轨迹。这种方法消除了记录颗粒位置的需求。

补充数据文件以Microsoft Excel .xlsx格式存储，并包含在压缩的.zip文件夹中，其目录结构和内容如下：

“Raw-AFT-UPb”文件夹包含原始LA-ICP-MS钙磷灰石裂变径迹年龄和长度数据。

每个样本的原始钙磷灰石U-Pb年龄数据、空白、校正等均包含在单独的电子表格标签中。所有AFT样本均以其分析编号（例如334-03）和样本编号z10907（11JP322B）指代。在“EPMA”和“Grain-Locations”文件夹中的所有其他数据中，每个颗粒仅以其分析编号指代，并指明其为年龄或长度颗粒。文件夹“EPMA”包含包含OH估计值的电子探针数据，以重量百分比氧化物或原子每公式的单位格式表示。这些数据可以转换为apfu，并使用Carlson等人（1999年）或Ketcham等人（2007年）的方程式（见正文详情）确定其rmr0值。

“Grain-Locations”文件夹包含每个样本中每个年龄和长度颗粒的x，y坐标。如果颗粒是重复测量，则会进行标记，即年龄颗粒1的EPMA测量也是长度颗粒15的测量。这是通过0至10微米（绿色）和10至50微米（橙色）的距离确定的。

“HeFTyFiles”文件夹包括所有AFT数据的浮点值输入文件，例如Ns、A、Pcorr、误差、U、Dpar等。还提供了多动力学建模的解释文件。