Background of the study
In April and May 2016, Expedition 364 of the International Ocean Drilling Program (IODP) conducted a study of the peaks inside the Chichurub crater (about 200 km in diameter) off the Yucatan Peninsula, Mexico, formed at the Cretaceous/Paleogene boundary approximately 66 million years ago. Drilling was performed on a ring structure (Fig. 1). A core sample approximately 830m long and consisting of sediments of post-asteroid impact age (Paleogene), impact-derived sediments, and basement rocks of the drilling area was obtained. Studies using core samples have provided detailed reconstructions of the crater formation process, immediate environmental changes, and ecosystem recovery rates associated with large-scale asteroid impacts (Morgan et al., 2016; Lowery et al., 2018; Riller et al., 2018; Gulick et al., 2019). However, the distribution of impact-causing asteroid-derived materials within craters is not well understood.