Magnetic Properties and Differentiation of the Antarctic Crust: Constraints From a Rock Magnetic Database

该奖项由极地项目办公室的南极地质和地球物理项目提供，用于支持南极岩石磁数据库的开发。南极数字磁异常项目（ADMAP）的目标是建立一个南极数字磁数据库，这将有助于评估南极洲冰下基岩的地质情况。ADMAP计划的一个组成部分是收集南极洲少数但非常重要的基岩暴露的岩石物理性质数据。这些露头代表了地球物理调查的唯一事实。该项目的目标是评估南极已发表和未发表的岩石磁点数据，并将这些信息输入数据库。目前，在南极太古宙至新生代岩石中，已经获得了至少10000个古磁钻岩芯样品，代表了1000多个地点。这样的集合代表了岩石物性数据的独特来源。本项目开发的数据库将包括岩石类型、场地位置、NRM、磁化率、各向异性、赤纬/倾角、VGP、岩石年龄、可能的磁载体、区域结构信息数据等相关数据。整理这些岩石物性数据站点将有助于未来对地球物理和古气候数据的解释，解决以下相关问题：1)东南极洲和西南极洲潜在地壳边界的划分（西南极洲有地界吗？）东南极洲是否存在地壳缝合带？2)横贯南极山脉寒武—奥陶系岩浆弧的范围，3)侏罗纪费拉群岩浆岩的几何形状和范围，4)新生代火山岩的范围，5)古气候研究的物源分析。该数据库将可在因特网上访问。一般格式将以新的美国南极地质数据库（AGD）为基础，但进行了修改，以包括岩石磁性信息。AGD的服务器位于伯德极地研究中心，也可以容纳南极岩石磁数据库（ARMD）。个别调查人员将能够在未来输入新的岩石磁性数据。ARMD将与现有的古地磁和南极数据库联系起来。

9909712GrunowThis award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports development of an Antarctic rock-magnetic database. The Antarctic Digital Magnetic Anomaly Project's (ADMAP) goal of creating an Antarctic digital magnetic database will help evaluate the sub-ice bedrock geology of Antarctica. An integral part of the ADMAP program is to assemble the rock physical property data from the few but very important bedrock exposures in Antarctica. These outcrops represent the only ground truth for geophysical surveys. The goals of this project are to evaluate published and unpublished rock magnetic site data from Antarctica and enter this information into a database. Presently, at least 10,000 paleomagnetic drill core samples, representing more than 1000 sites have been obtained in Archean to Cenozoic Antarctic rocks. Such a collection represents a unique source of rock physical property data. The database developed by this project would include rock type, site location, NRM, susceptibility, anisotropy, declination/inclination, VGP, rock age, likely magnetic carrier, regional structural information data, and other related data. Compiling these rock physical property data sites would be useful for future interpretations of geophysical and paleoclimate data by addressing questions related to:1) The demarcation of potential crustal boundaries in both East and West Antarctica (are there terrane boundaries in West Antarctica?, are crustal suture zones present in East Antarctica?, etc),2) The extent of the Cambro-Ordovician magmatic arc in the Transantarctic Mountains,3) The geometry and extent of Jurassic Ferrar Group magmatic rocks,4) The extent of Cenozoic volcanic rocks, and5) Provenance analyses for paleoclimate research.The database will be accessible on the Internet. The general format will be based on the new US Antarctic Geologic Database (AGD) but modified to include the rock magnetic information. The server for the AGD is located at the Byrd Polar Research Center and can accommodate the Antarctic rock magnetic database (ARMD) as well. Individual investigators will be able to enter new rock magnetic data in the future. The ARMD will be linked to existing paleomagnetic and Antarctic databases.