Supporting Information 5

Detailed fission track age data for each sample. 238U refers to the measured 238U concentration for each grain in ppm with SD = 1σ uncertainty. Ns represents the number of counted tracks. Area = the size of the counted area in cm2. Rho s = the spontaneous fission track density. t(Ma) is the calculated fission track age for each grain in Ma with SD = 1σ age uncertainty. 

Detailed fission track length data for each analysed confined fission track. Length values are given in µm. Azimuth is the angle to the c-axis and Dip is the angle to the surface (both in °). Dpar are given as grain averages with 1σ standard deviations in µm.

各样本的详细裂变径迹（fission track）年龄数据。其中238U为单颗粒实测的238U浓度，单位为ppm，SD代表1σ不确定度。Ns为统计得到的径迹数量。Area为统计区域的面积，单位为cm²。Rho s为自发裂变径迹密度。t(Ma)为单颗粒计算得到的裂变径迹年龄，单位为百万年（Ma），SD代表1σ年龄不确定度。

各分析得到的受限裂变径迹（confined fission track）的详细裂变径迹长度数据。长度数值单位为µm（微米）。Azimuth为与晶体c轴的夹角，Dip为与样品表面的夹角，二者单位均为°（度）。Dpar以单颗粒平均值形式给出，其1σ标准偏差单位为µm。