40Ar/39Ar ages of boulders drilled at DSDP Hole 57-439

The 40Ar/39Ar stepheating dating method was applied to parts of three boulders recovered at Site 439, DSDP Leg 57. All the samples gave a well-defined isochron. The isochron ages agree with each other within the experimental uncertainties and give a mean value of 21.4 ± 1.0 Ma.

本研究将氩-40/氩-39阶步加热定年法（40Ar/39Ar stepheating dating method）应用于深海钻探计划（Deep Sea Drilling Project, DSDP）第57航次439站位回收的3块砾石的部分样品。所有样品均得到了定义清晰的等时线。各等时线年龄在实验不确定度范围内相互吻合，所得平均年龄为21.4±1.0 Ma。