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

南极地壳的磁性和分异：来自岩石磁性数据库的约束

• 批准号: 9909712
• 负责人: Anne Grunow
• 金额: $ 8.4万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909712&HistoricalAwards=false
• 关键词: Magnetic; Properties; Differentiation; Antarctic; Crust

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 The goals of this project are to evaluate published and unpublished rock magnetic site data from Antarctica and enter this information into a database.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.

9909712该奖项由极地计划办公室南极地质和地球物理计划提供，支持南极岩石-磁性数据库的发展。南极数字磁异常项目(ADMAP)的目标是创建南极数字磁数据库，这将有助于评估南极洲的冰下基岩地质。Admap计划的一个组成部分是收集南极洲为数不多但非常重要的基岩裸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地面事实。该项目的目标是评估已公布和未公布的南极洲岩石磁性站点数据，并将这些信息输入数据库。目前，在太古代至新生代南极岩石中已获得至少1万个古地磁钻芯样品，代表1000多个地点。这样的集合代表了岩石物理特性数据的唯一来源。该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、倾角/倾角、VGP、岩石年龄、可能的磁性载体、区域构造信息数据以及其他相关数据。汇编这些岩石物理性质数据站点将有助于未来地球物理和古气候数据的解释，解决以下问题：1)南极东部和西部潜在地壳边界的划定(西部南极是否有地体边界？，东部南极是否存在地壳缝合带？等)，2)横贯北极山脉的寒武纪-奥陶纪岩浆弧的范围，3)侏罗纪费拉尔群岩浆岩的几何和范围，4)新生代火山岩的范围，5)古气候研究的物源分析。数据库将在互联网上访问。通用格式将基于新的美国南极地质数据库(AGD)，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性数据库(ARMD)。未来，个人研究人员将能够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相联系。