DOI: 10.1016/j.epsl.2018.07.012
Scopus记录号: 2-s2.0-85050286266
论文题名: Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)
作者: Launay G. ; Sizaret S. ; Guillou-Frottier L. ; Gloaguen E. ; Pinto F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 499 起始页码: 1
结束页码: 12
语种: 英语
英文关键词: flow direction
; flow velocity
; growth bands
; magmatic-hydrothermal activity
; Panasqueira
; tourmaline
Scopus关键词: Cupolas
; Deposits
; Domes
; Economic geology
; Flow of fluids
; Flow velocity
; Mineralogy
; Ores
; Rocks
; Silicate minerals
; Wall rock
; Flow direction
; Hydrothermal activity
; Hydrothermal system
; Intrusion-related ore deposits
; Metasomatic alterations
; Mineralizing fluids
; Panasqueira
; tourmaline
; Transport properties
; copper
; flow velocity
; fluid flow
; hydrodynamics
; hydrothermal activity
; hydrothermal fluid
; magmatism
; ore deposit
; quartz vein
; tin
; tourmaline
; tungsten
; Faro [Portugal]
; Panasqueira
; Portugal
英文摘要: Deciphering the behavior of fluid flow at the magmatic-hydrothermal transition is crucial to understanding the physical processes leading to the formation of intrusion-related ore deposits and hence to predicting the locations of mineralized bodies. However, the hydrodynamics (direction and velocity) of the hydrothermal fluid flows related to this transitional stage remains poorly constrained. Here we present a coupled textural and chemical study performed on tourmaline growth bands to constrain fluid flow during the initiation of the hydrothermal system of the Panasqueira W–Sn–(Cu) deposit. This exceptional deposit consists of a dense network of flat wolframite and cassiterite-bearing quartz veins intensely developed above a well-known but hidden greisen cupola. The W–Sn mineralization is preceded by a tourmalinization stage occurring as metasomatic halos around veins and as selvages developed along the vein–wall-rocks contacts. Results emphasize the key role of the greisen cupola in fluid focusing and the role of fluid overpressure during vein opening. Velocity values highlight an efficient transport of metals in veins largely dominated by advective processes (10−4 to 10−3 m s−1), whereas fluid flow in the altered wall-rocks is slow and pervasive (10−6 to 10−5 m s−1), suggesting that element transport through the metasedimentary host rock was low and limited to the alteration haloes. LA-ICP-MS analyses of tourmaline growth bands reveal that fluids coming from the cupola are enriched in Na, K, Li, Sr and Sn, emphasizing the contribution of magmatic fluids during vein formation and the metasomatic alteration of the wall-rocks. More generally, this study demonstrates that the apical portions of granite bodies act as emanative centers of mineralizing fluids, and highlights the usefulness of mineral growth band analysis in the search for intrusion-related mineralization. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109707
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: ISTO, UMR 7327, Université d'Orléans, CNRS, BRGM, Orléans, F-45071, France; BRGM, Orléans, F-45060, France; Beralt Tin and Wolfram, S.A., Geology Department, Barroca Grande, Portugal; Institute of Earth Sciences (ICT), Pole of University of Porto, Rua do Campo Alegre 687, Porto, 4169-007, Portugal
Recommended Citation:
Launay G.,Sizaret S.,Guillou-Frottier L.,et al. Deciphering fluid flow at the magmatic-hydrothermal transition: A case study from the world-class Panasqueira W–Sn–(Cu) ore deposit (Portugal)[J]. Earth and Planetary Science Letters,2018-01-01,499