Petrology of Gravel Size Clasts from Miocene sediments collected at Site U1521 during International Ocean Discovery Programme (IODP) Expedition 374 to the Ross Sea, Antarctica

This dataset comprises continuous logging of clasts >2 mm from International Ocean Discovery Program Expedition 374 Site U1521 to the Ross Sea, collected on the RV JOIDES Resolution. Shipboard biostratigraphy and magnetostratigraphy suggests the sediments are early Miocene in age (McKay et al., 2019, Proceedings of the International Ocean Discovery Program). Logged clasts are grouped by core into seven main lithological groups: igneous rocks, quartz fragments, dolerites, volcanic rocks, metamorphic rocks, sedimentary rocks and sedimentary intraclasts. A full methods description is provided at the bottom of the data file. The clast abundances can be compared to knowledge of terrestrial geology, allowing the changing provenance of the sediments to be traced.

本数据集针对罗斯海（Ross Sea）国际大洋发现计划（International Ocean Discovery Program）374航次U1521站位的粒径大于2毫米的岩屑开展连续录井工作，数据采集依托"乔迪斯·决心号"（RV JOIDES Resolution）科考钻探船完成。船上的生物地层学（biostratigraphy）与磁地层学（magnetostratigraphy）研究表明，该套沉积物形成于中新世早期（McKay等人，2019年，《国际大洋发现计划论文集》）。按岩芯对已录井的岩屑进行分类，共划分为7个主要岩性组（lithological groups）：火成岩、石英碎屑、辉绿岩（dolerites）、火山岩、变质岩、沉积岩以及沉积内碎屑（sedimentary intraclasts）。完整的方法学说明详见数据文件末尾。可将岩屑丰度数据与陆地地质资料进行对比，以此追溯沉积物物源的演化过程。