Origin of Massive Iron Oxide Deposits in Silicic Igneous Rocks

硅质火成岩中大量氧化铁矿床的成因

• 批准号: 9405050
• 负责人: Stephen Kesler
• 金额: $ 2.5万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-15 至 1996-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9405050&HistoricalAwards=false
• 关键词: Origin; Massive; Iron; Oxide; Deposits

9405050 Kesler This is a preliminary study of the Vergenoeg iron-fluorite deposit in South Africa. Vergenoeg consists if fluorite and iron oxides and is closely associated with silicic extrusive rocks. Research a Vergenoeg will attempt to answer two questions. The first question involves the nature of fluid phases present during formation of the deposits, which should clarify the relation between silicate and iron oxide magmas and the possible role of volatile phases(s) in causing the heavy iron oxide phase to extrude. The second question is why the immiscible iron oxide phase separated from the silicate magma, if indeed it did. We plan to map these rocks, verify the stratigraphic position of iron ore in the sequence and then look for any changes in the oxygen isotope composition of the silicic rocks, which might relate to introduction of ground (e.g. meteoric) water.

9405050凯斯勒这是对南非韦尔杰尼格铁萤石矿床的初步研究。韦尔杰尼格由萤石和铁氧化物组成，与硅质喷出岩密切相关。韦尔杰尼格的研究将试图回答两个问题。第一个问题涉及矿床形成过程中存在的流体相的性质，这将澄清硅酸盐和氧化铁岩浆之间的关系，以及挥发相(S)在导致重氧化铁相挤出中的可能作用。第二个问题是，如果确实如此，为什么不混溶的氧化铁相会从硅酸盐岩浆中分离出来？我们计划绘制这些岩石的地图，核实铁矿石在层序中的地层位置，然后寻找硅质岩石的氧同位素组成的任何变化，这可能与地下水(例如大气降水)的引入有关。