Fission-track analyses of detrutal apatites from ODP Sites 116-717 and 116-718@en

This paper presents fission-track ages and confined track-length measurements from detrital apatites recovered from Ocean Drilling Program Leg 116 Site 717 and 718 cores. We interpret these data in terms of the post-depositional thermal history at these two sites and the thermotectonic history of apatite source areas. Composite apatite samples were derived by combining fine-grained sand samples from Sites 717 and 718 cores over 70- to 120-m intervals over the total depth penetrated at Sites 717 (T.D. = 820 mbsf) and 718 (T.D. = 960 mbsf). Thirty apatite grains per composite sample from ten samples (at least every other sampled interval) were dated and track-length measurements (20-50 per sample) were obtained for all samples. […]本研究报道了取自大洋钻探计划（Ocean Drilling Program）第116航次717与718站位岩心的碎屑磷灰石（detrital apatites）的裂变径迹年龄（fission-track ages）与封闭径迹长度（confined track-length）测量数据。 基于上述数据，我们对两个站位的沉积后热历史以及磷灰石物源区的热构造演化历史进行了解读。 本研究通过合并717站位（总穿透深度T.D. = 820 海底以下米，meters below sea floor, mbsf）与718站位（总穿透深度T.D. = 960 海底以下米，meters below sea floor, mbsf）岩心中对应各自总穿透深度范围内70~120米层段的细粒砂岩样品，制备得到复合磷灰石样品。 针对10个复合样品（至少每隔一个采样层段选取1个），每个样品选取30颗磷灰石颗粒进行裂变径迹定年；同时对所有样品开展径迹长度测量，每个样品测量20~50条径迹。 […]