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

研究重点是新西兰的远洋和半远洋沉积技术。科学目标涉及新西兰南岛东北部暴露的中上层和半深海沉积物的底栖古生态学、沉积学和环境地层学，根据生物沉积构造（ichnofabrics）和特征痕迹化石组合（ichnofacies）确定。研究将集中在Amuri群（上白垩统至上始新统）的细粒、深水海相碳酸盐岩、泥灰岩和粘土单元。特别强调的将是底栖生物群落古生态学（即，从复合地层中推断出的水生动物的层序关系）、地层相关系（即，说明某些沉积制度和沉积环境的特殊微量化石组合的地质意义）和早期成岩作用的生物成因控制(例如，优先胶结、磷化和/或石化)。此外，某些鱼相的循环重复（例如，以海甾烷为主、植藻为主和/或球粒陨石为主的带）将根据当前的区域构造论、全球海平面上升、全球大气和海洋事件的轨道强迫等观点加以解释。

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.