Ichnofacies and Ichnofabric Analysis of Pelagic and Hemipelagic Deposits (Upper Cretaceous-Tertiary), South Island, New Zealand

新西兰南岛远洋和半远洋沉积物（上白垩纪-第三纪）的地相和地貌结构分析

• 批准号: 8720779
• 负责人: Allan Ekdale
• 金额: $ 8.2万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-01-15 至 1990-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720779&HistoricalAwards=false
• 关键词: Ichnofacies; Ichnofabric; Analysis; Pelagic; Hemipelagic

The research proposed focuses on the ichnology of pelagic and hemipelagic deposits in New Zealand. The scientific objectives involve the endobenthic paleoecology, sedimentology and evironmental stratigraphy of pelagic and hemipelagic deposits exposed in the northeastern part of the South Island of New Zealand, as determined from biogenic sedimentary fabrics (ichnofabrics) and characteristic trace fossil associations (ichnofacies). The study will focus on fine-grained, deep-water marine carbonate, marl and clay units in the Amuri Group (Upper Cretaceous to Upper Eocene in age). Particular emphasis will be on endobenthic community paleoecology (i.e., tiering relationship of infaunal animals deduced from composite ichnofabrics), ichnofacies relations (i.e., the geologic significance of particular trace fossil assemblages that exemplify certain sedimentologic regimes and depositional environments) and biogenic controls on early diagenesis (e.g., preferential cementation phosphatization and/or chertification of trace fossils). In addition, cyclic repetition of certain ichnofacies (e.g., Thalassinoides-dominated, Zoophycos-dominated and/or Chondrites-dominated zones) will be interpreted in relation to current ideas of regional tectonism, global eustacy, and orbital forcing of worldwide atmospheric and oceanographic events.

建议的研究重点是深海遗迹学， 新西兰的半远洋沉积。 科学目标 涉及底栖古生态学、沉积学和 远洋和半远洋沉积物的沉积地层学 出露于新西兰南岛东北部 新西兰，根据生物沉积组构确定 （遗迹组构）和特征遗迹化石组合 （遗迹相）。 这项研究将集中在细粒，深水 阿姆里群（上）海相碳酸盐岩、泥灰岩和粘土单元 白垩纪至始新世晚期）。 将特别强调底栖生物群落 古生态学（即，底栖动物层次关系 从复合遗迹组构推断），遗迹相关系（即， 特殊遗迹化石组合的地质意义 它与某些沉积体系和沉积作用有关， 环境）和对早期成岩作用的生物控制（例如， 优先胶结磷石化和/或 遗迹化石）。 此外，循环重复某些 遗迹相（例如，以似海生物为主，以藻类动物为主 和/或球粒陨石为主的区域）将被解释为 区域构造运动，全球海平面上升， 全球大气和海洋事件的轨道强迫。