Structural geology and tectonic significance of basin-fill sedimentary rocks, of ice-transported boulders therein and of volcanics recovered by ANDRILL cores in the McMurdo Sound region: Implications for the Cenozoic tectonic and clacial/climatic evolutio

麦克默多海峡地区盆地填充沉积岩、其中的冰搬运巨石以及 ANDRILL 岩芯回收的火山岩的构造地质学和构造意义：对新生代构造和冰河/气候演化的影响

• 批准号: 26909292
• 负责人: Dr. Andreas Läufer
• 金额: --
• 依托单位: Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/26909292?language=en
• 关键词: Structural; geology; tectonic; significance; basin

The ANtarctic DRILLing Program (ANDRILL) will drill a stratigraphic core from a platform located on Ross Island in the McMurdo Ice Shelf (MIS) sector of the Ross Ice Shelf. Drilling is scheduled for the 2006/07 season. Primary target is a 1.2 km thick succession of Plio-Pleistocene glacimarine, terrigenous, volcanic, and biogenic sediments that were deposited in a flexural moat depression formed by loading of the Ross Island volcanic complex. The drill site is located within the Victoria Land Basin of the West Antarctic Rift System. Its western termination is represented by the Transantarctic Mountains front, an asymmetric rift shoulder that is segmented by numerous transverse and oblique faults and has experienced several phases of uplift and denudation since the Cretaceous. The primary goal will be the analysis of natural fractures in the core and the reconstruction of kinematics and dynamics of rifting, the related faulting history, and palaeostress states in the western Ross Sea in Late Neogene-Recent times. Absolute age constraints are expected from dating tephra horizons within the sequence. Additionally, provenance studies of ice-transported basement boulder-to pebble-size clasts in the cores will be done in collaboration with petrology and geo- and thermochronology teams. These studies will provide a tool for correlation with rock types in the hinterland and will help to identify potential directions of ice flow in the past.

南极钻探计划（ANDRILL）将在罗斯冰架麦克默多冰架（MIS）部分罗斯岛的一个平台上钻探地层核心。钻探计划在2006/07年度进行。主要目标是1.2公里厚的上新世-更新世冰川海相、陆源、火山和生物沉积物序列，这些沉积物沉积在罗斯岛火山复合体加载形成的弯曲护城河洼地中。钻探地点位于南极西部裂谷系的维多利亚陆盆内。其西端以横贯南极山脉前缘为代表，这是一个不对称的裂谷肩，由许多横向和斜向断裂分割，自白垩纪以来经历了几个阶段的隆升和剥蚀。主要目标是分析岩心中的天然裂缝，重建晚新近世至新近世罗斯海西部的裂陷运动学和动力学、相关的断裂历史和古应力状态。通过对序列内的火苗视界定年，可以得到绝对的年龄限制。此外，将与岩石学、地质和热年代学团队合作，对岩心中冰运基底巨石到鹅卵石大小的碎屑进行物源研究。这些研究将提供一个与内陆岩石类型相关的工具，并将有助于确定过去冰流的潜在方向。