Magma Flow Directions in Ferrar Intrusive Rocks using Anisotropy of Magnetic Susceptibility Methods

使用磁化率各向异性方法确定费拉尔侵入岩中的岩浆流动方向

• 批准号: 9711722
• 负责人: Anne Grunow
• 金额: $ 1.25万
• 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: 1997
• 资助国家: 美国
• 起止时间: 1997-04-01 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9711722&HistoricalAwards=false
• 关键词: Magma; Flow; Directions; Ferrar; Intrusive

9711722 Grunow Abstract This award supports an exploratory program to measure the anisotropy of magnetic susceptibility (AMS) on existing samples of the Ferrar intrusive rocks to provide preliminary magma flow directions. The AMS method represents one of the few techniques available capable of determining magma flow directions and hence, constrain magma emplacement models. The Ferrar province (4000km long), along with the Karoo province in South Africa, represents the most significant flood basalt province associated with Gondwana break-up. Various models have been proposed in which the Ferrar magmas are thought to have emanated from a point source beneath South Africa, beneath the Dufek massif, or from multiple point sources. The AMS method provides a direct test of these models. Very little AMS work has been done on the Ferrar province and so it is uncertain whether the Ferrar rocks will yield any magma dlow information. Ferrar samples (75 cores) from a 3000 km segment of this province are presently available and more will be collected in the upcoming field season and made available to this project. These samples will be analyzed at the University of Michigan paleomagnetism laboratory. Results will demonstrate the viability of the method on Ferrar province rocks and may also provide preliminary constraints on Ferrar plume versus multiple source emplacement models.

小行星9711722格鲁诺 摘要该奖项支持一项勘探计划，以测量现有样品的Ferrar侵入岩的磁化率（AMS）的各向异性，以提供初步的岩浆流动方向。 AMS方法是少数几种能够确定岩浆流动方向的技术之一，因此，限制岩浆侵位模型。 费拉尔省（4000公里长），沿着与卡鲁省在南非，代表了最重要的洪水玄武岩省与冈瓦纳分裂。 人们提出了各种不同的模型，认为费拉尔岩浆是从南非下面的一个点源、Dufek火山口下面的一个点源或多个点源发出的。 AMS方法提供了对这些模型的直接检验。 在费拉尔地区进行的AMS工作非常少，因此不确定费拉尔岩石是否会产生任何岩浆流信息。 目前已获得来自该省3000公里路段的Ferrar样本（75个岩心），在即将到来的野外季节将收集更多样本，并提供给本项目。 这些样本将在密歇根大学古地磁实验室进行分析。 结果将证明该方法的可行性费拉尔省的岩石，也可能提供初步的限制费拉尔羽与多源定位模型。