Kassa Solomon, Tsegab Haylay, Sum Chow Weng, CheeMeng Choong
Department of Applied Geology, School of Applied Natural Science, Adama Science and Technology University, Adama, Ethiopia.
Department of Geosciences, Faculty of Geosciences and Petroleum Engineering, Universiti Teknologi PETRONAS, 32610, Bandar Sngineeringeri Iskandar, Perak, Malaysia.
Data Brief. 2019 Jun 21;25:104162. doi: 10.1016/j.dib.2019.104162. eCollection 2019 Aug.
Fission tracks are linear trails of intense radiation damage in the crystal structure of a mineral, produced by spontaneous fissioning of uranium-238 (U) atoms. Detail information on the low-temperature thermal histories of rocks, below∼120 °C for tracks in apatite and below∼350 °C for zircon, can be provided by Fission-track (FT) analysis. The purpose of this article is to present apatite and zircon fission-track data, and U-Pb granite ages that provide information about the cooling histories of a rock which can be crucial in comprehending the exhumation episodes of the study area, in particular, and the region, in general. Granite samples were collected along the same vertical profile at different elevation, 178-944 m.a.s.l. These samples were used to determine Fission-Track and crystallization ages. HeFTy software was employed to interpret the cooling histories of the samples using forward and inverse models. The inverse model was an approach of reproducing the observed data, and it was carried out only for fission-track data from the apatite grains. And it was constructed after generating a number of forward models, where in each of these models the predicted apatite fission-track parameters were compared to the measured values. The apatite fission track (AFT) and zircon fission track (ZFT) data indicated expected age trends, the older ages at higher elevations and the younger ages at lower elevations. Similarly, the data shows that the apatite and zircon FT ages appear younger than the age of the rock crystallization. The U-Pb age in zircon consistently suggest the age of the granite is Late Triassic.
裂变径迹是矿物晶体结构中由铀-238（U）原子自发裂变产生的强烈辐射损伤的线性轨迹。裂变径迹（FT）分析可以提供有关岩石低温热历史的详细信息，对于磷灰石中的径迹而言，温度低于约120°C，对于锆石中的径迹而言，温度低于约350°C。本文的目的是展示磷灰石和锆石的裂变径迹数据以及铀铅花岗岩年龄，这些数据能够提供有关岩石冷却历史 的信息，这对于理解研究区域特别是整个地区的剥露事件至关重要。花岗岩样品是沿着海拔178 - 944米的同一垂直剖面在不同高度采集的。这些样品用于确定裂变径迹和结晶年龄。使用HeFTy软件通过正向和反向模型来解释样品的冷却历史。反向模型是一种重现观测数据的方法，仅对磷灰石颗粒的裂变径迹数据进行。它是在生成多个正向模型之后构建的，在每个正向模型中，将预测的磷灰石裂变径迹参数与测量值进行比较。磷灰石裂变径迹（AFT）和锆石裂变径迹（ZFT）数据显示出预期的年龄趋势，即海拔较高处年龄较老，海拔较低处年龄较年轻。同样，数据表明磷灰石和锆石的FT年龄似乎比岩石结晶年龄年轻。锆石中的铀铅年龄始终表明花岗岩的年龄为晚三叠世。
