Eocene Terrane Accretion in Northern Cascadia Recorded by Brittle Left-lateral Slip on the San Juan Fault

Structural data: The following data were collected during three seasons of fieldwork between May 2017 and July 2019. Structural data were collected during outcrop mapping using a brunton compass and were documented using a field notebook or a digital tablet. Strike and dips of fault planes, bedding planes, and folation follow the right-hand rule. Structural data was compiled and analyzed using the programs Stereonet 10.1.6 and FaultKin 8.1.2, available at https://www.rickallmendinger.net/. UTM coordinates in BC Albers NAD 83 Zone 10 coordinate system are provided for each data point. Fault slickening striae were collected as rakes and converted to striae trend and plunge using FaultKin. T- and P-axes were calculated using FaultKin. In the fault kinematics table, the T-axes are the tensional incremental strain axes, and the P-axes are the pressure incremental strain axes. Sites and domains are defined in the manuscript. Sr isotope data: Sr isotope data were obtained from analyses of foraminifer samples at the University of Waterloo by the Thermal Ionization Mass Spectrometry (TIMS) Facility. Foraminifers were extracted from ~ 2 kg samples collected during fieldwork. Specimens were hand-picked from samples under a microscope. The most abundant species with the least diagenetic alteration was chosen for Sr isotope analyses. Sample locations are provided with reference to Fig.3 in the manuscript associated with this dataset. More details on data acquisition and methods can be found in the README.txt file.构造数据：本数据集的构造数据采集于2017年5月至2019年7月间的三期野外工作。构造数据在野外露头填图过程中通过布伦顿罗盘（Brunton compass）采集，并以野外记录本或数位平板进行记录。断层面、层理面及面理（foliation）的走向与倾角均遵循右手定则。构造数据通过Stereonet 10.1.6与FaultKin 8.1.2两款软件进行整理与分析，上述软件可从https://www.rickallmendinger.net/获取。每个数据点均附带BC Albers NAD 83第10带坐标系下的UTM坐标。断层擦痕以侧伏角形式采集，随后通过FaultKin软件转换为擦痕的走向与倾伏角。利用FaultKin软件计算得到T轴与P轴。在断层运动学表格中，T轴为张性增量应变轴，P轴为压性增量应变轴。测区与构造域的定义详见相关手稿。 锶同位素数据：锶同位素数据由滑铁卢大学热电离质谱（Thermal Ionization Mass Spectrometry, TIMS）实验室通过有孔虫样品分析获取。有孔虫从野外工作采集的约2千克样品中分离得到，并在显微镜下手动挑选标本。选取丰度最高且成岩蚀变程度最低的有孔虫物种开展锶同位素分析。样品点位信息详见本数据集配套手稿中的图3。关于数据采集与实验方法的更多细节，可查阅本数据集附带的README.txt文件。