Heavy mineral abundance of ODP Leg 174A sites@en

The purpose of this paper is to report the heavy mineral content of Miocene to Pleistocene sequences drilled during Ocean Drilling Program Leg 174A on the New Jersey Shelf. Sandy intervals recovered from Holes 1071A, 1071F, 1072A, and 1073A were sampled for heavy mineral analysis. Because of the low core recovery of the sandy parts of the succession, sampling has been incomplete. In spite of the resulting restriction and because of major variations in heavy mineral assemblages, eight distinct heavy mineral associations could be defined. The data presented thus considerably extend the present knowledge on the lithology of the stratigraphic record as described by Austin, Christie-Blick, Malone, et al. (1998). In this chapter the heavy mineral associations and their assignment to particular sequences are described.本文旨在报道新泽西陆架区大洋钻探计划（Ocean Drilling Program）第174A航次所钻取的中新世至更新世地层序列中的重矿物（heavy mineral）含量。研究采集了1071A、1071F、1072A及1073A钻井的砂质层段样品，用于重矿物分析。由于该层序砂质部分的岩心收获率较低，采样工作尚未完全完成。尽管存在上述采样限制，但鉴于重矿物组合存在显著差异，本次研究共识别出8种不同的重矿物组合。因此，本次展示的数据极大地拓展了Austin、Christie-Blick、Malone等人（1998）对该地层记录岩性的现有认知。本章将对本次识别出的重矿物组合及其对应归属的特定地层序列进行详细说明。