Grain character data (grain size, sorting and shape) from quasi-coeval topset, foreset and bottomset deposits of Miocene clinothems, offshore New Jersey, USA@en

These data comprise a grain character dataset (grain size, sorting and grain shape) from the topset, foreset, and bottomset deposits of four successive Miocene intrashelf clinothem sequences (m5.7, m5.4, m5.45 and m5.3). These clinothems have been mapped and described by various authors (e.g. Monteverde et al., 2008; Mountain et al., 2010; Miller et al., 2013), and were continuously cored and logged during IODP (International Ocean Discovery Program) Expedition 313 (Offshore New Jersey, USA). In total, 878 sediment samples were collected from the working half of three cores recovered during IODP Expedition 313, offshore New Jersey. The three cores, kept in cold storage at the University of Bremen, are from Sites M27, M28 and M29. The stratigraphic horizons targeted during this investigation were exclusively Miocene in age, corresponding to depths of 225 - 365 mcd (metres composite depth), 312 - 600 mcd, and 600 - 730 mcd in cores M27, M28 and M29 respectively. Collectively, a total of 560 m of core has been sampled. With reference to the seismic clinothem model presented in Miller et al. (2013), these stratigraphic depths correspond to the interval between major seismic sequence boundaries m5.7 - m5.2. Where no prominent grain size change was recorded in either the cumulative lithology presented in Miller et al. (2013) or core descriptions (Mountain et al., 2010), the strategy for sample collection was to remove 15 x 15 x 15 mm sediment slices, subsampled at ~ 500 mm intervals down-core. The sampling strategy was amended to target stratigraphic depths where grain size change was most prominent. At these intervals, highlighted by the broad patterns of down-core lithological and grain size change (Mountain et al., 2010; Browning et al., 2013; Miller et al., 2013), sampling density was increased to ~ 300 mm intervals. During the sampling process there was some deviation from this sampling configuration in order to avoid 1) horizons of cementation, (2) biscuiting disturbance, 3) key stratigraphic surfaces and 4) heavily sampled intervals. Due to the pervasive presence of biogenic material (including calcareous skeletal remains, shell fragments, and organic matter) sample pre-treatment was undertaken prior to grain character measurements, in order to remove these components. […]本数据集包含一套粒度特征数据集（涵盖粒度、分选性及颗粒形态），采集自4套连续的中新世陆架内斜层序（m5.7、m5.4、m5.45与m5.3）的顶积层、前积层与底积层。 该套斜层序已被多位学者（如Monteverde等人，2008；Mountain等人，2010；Miller等人，2013）完成编录与描述，并在美国新泽西州近海的国际大洋发现计划（International Ocean Discovery Program, IODP）313航次中被连续取芯与测井。 本次研究共从新泽西州近海IODP 313航次获取的3根岩芯的研究半段中，采集了总计878份沉积物样品。 这3根岩芯均保存于不来梅大学的冷藏库中，分别来自M27、M28与M29三个站位。 本研究所针对的地层均为中新世时期，对应M27、M28、M29号岩芯的米复合深度（metres composite depth, mcd）分别为225~365 mcd、312~600 mcd与600~730 mcd。 总计采样覆盖的岩芯长度达560米。 参照Miller等人（2013）提出的地震斜层序模型，上述地层深度对应主要地震层序边界m5.7至m5.2之间的地层段。 若在Miller等人（2013）提出的累积岩性序列或岩芯描述（Mountain等人，2010）中未观测到显著粒度变化，则采样方案为沿岩芯向下以约500 mm的间隔采集15×15×15 mm的沉积物切片作为样品。 针对粒度变化最为显著的地层段，采样方案进行了调整。在由岩芯向下岩性与粒度变化的宏观特征所指示的此类层段（Mountain等人，2010；Browning等人，2013；Miller等人，2013）中，采样密度提升至约300 mm间隔。 采样过程中，为规避以下情况，实际采样布局存在一定调整：1）胶结层段；2）饼化扰动层；3）关键地层界面；4）已密集采样的层段。 由于沉积物中普遍存在生物成因物质（包括钙质骨骼残骸、贝壳碎片与有机质），因此在粒度特征测量前需对样品进行预处理以去除此类组分。……