Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s00126-017-0718-8 |
Mineral chemistry of magnetite from magnetite-apatite mineralization and their host rocks: examples from Kiruna, Sweden, and El Laco, Chile | |
Broughm, Shannon G.1; Hanchar, John M.1; Tornos, Fernando2; Westhues, Anne1; Attersley, Samuel1 | |
通讯作者 | Hanchar, John M. |
来源期刊 | MINERALIUM DEPOSITA |
ISSN | 0026-4598 |
EISSN | 1432-1866 |
出版年 | 2017 |
卷号 | 52期号:8页码:1223-1244 |
英文摘要 | Interpretation of the mineralizing environment of magnetite-apatite deposits remains controversial with theories that include a hydrothermal or magmatic origin or a combination of those two processes. To address this controversy, we have analyzed the trace element content of magnetite from precisely known geographic locations and geologic environments from the Precambrian magnetite-apatite ore and host rocks in Kiruna, Sweden, and the Pliocene-Holocene El Laco volcano in the Atacama desert of Chile. Magnetite samples from Kiruna have low trace element concentrations with little chemical variation between the ore, host, and related intrusive rocks. Magnetite from andesite at El Laco, and dacite from the nearby Lascar volcano, has high trace element concentrations typical of magmatic magnetite. El Laco ore magnetite have low trace element concentrations and displays growth zoning in incompatible elements (Si, Ca, and Ce), compatible elements (Mg, Al, and Mn), large-ion lithophile element (Sr), and high field strength element (Y, Nb, and Th). The El Laco ore magnetite are similar in composition to magnetite that has been previously interpreted to have crystallized from hydrothermal fluids; however, there is a significant difference in the internal zoning patterns. At El Laco, each zoned element is either enriched or depleted in the same layers, suggesting the magnetite crystallized from a volatile-rich, iron-oxide melt. In general, the compositions of magnetite from these two deposits plot in very wide fields that are not restricted to the proposed fields in published discriminant diagrams. This suggests that the use of these diagrams and genetic models based on them should be used with caution. |
英文关键词 | Magnetite Magnetite-apatite deposits Kiruna-type deposits El Laco Magmatic-hydrothermal |
类型 | Article |
语种 | 英语 |
国家 | Canada ; Spain |
收录类别 | SCI-E |
WOS记录号 | WOS:000416179100008 |
WOS关键词 | FIELD EVIDENCE BEARING ; IRON-TITANIUM OXIDE ; NORTHERN CHILE ; ICP-MS ; MAGMATIC ORIGIN ; TRACE-ELEMENTS ; ORE-DEPOSITS ; GEOCHEMISTRY ; ZONE ; TEXTURES |
WOS类目 | Geochemistry & Geophysics ; Mineralogy |
WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/201112 |
作者单位 | 1.Mem Univ Newfoundland, Dept Earth Sci, St John, NF A1B 3X5, Canada; 2.Ctr Astrobiol CSIC INTA, Ctra Ajalvir,Km 4-5, Madrid 28850, Spain |
推荐引用方式 GB/T 7714 | Broughm, Shannon G.,Hanchar, John M.,Tornos, Fernando,et al. Mineral chemistry of magnetite from magnetite-apatite mineralization and their host rocks: examples from Kiruna, Sweden, and El Laco, Chile[J],2017,52(8):1223-1244. |
APA | Broughm, Shannon G.,Hanchar, John M.,Tornos, Fernando,Westhues, Anne,&Attersley, Samuel.(2017).Mineral chemistry of magnetite from magnetite-apatite mineralization and their host rocks: examples from Kiruna, Sweden, and El Laco, Chile.MINERALIUM DEPOSITA,52(8),1223-1244. |
MLA | Broughm, Shannon G.,et al."Mineral chemistry of magnetite from magnetite-apatite mineralization and their host rocks: examples from Kiruna, Sweden, and El Laco, Chile".MINERALIUM DEPOSITA 52.8(2017):1223-1244. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。