DOI: 10.1007/s00531-014-1015-8
论文题名: Formation and age of sphalerite mineralization in carbonate rocks of Bajocian age in the Swiss Jura Mountains: Evidence of Mesozoic hydrothermal activity
作者: Efimenko N. ; Schneider J. ; Spangenberg J.E. ; Chiaradia M. ; Adatte T. ; Föllmi K.B.
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 4 起始页码: 1059
结束页码: 1082
语种: 英语
英文关键词: Cadmium
; Jura Mountains
; Jurassic
; Limestone
; Rb-Sr dating of sphalerite
; Sphalerite
Scopus关键词: Bajocian
; cadmium
; carbonate rock
; hydrothermal activity
; hydrothermal circulation
; hydrothermal fluid
; limestone
; mineralization
; rubidium-strontium dating
; sphalerite
; Jura Mountains
; Switzerland
英文摘要: A combination of petrographic and geochemical techniques was applied to better constrain the origin and evolution of the fluid systems responsible for the formation of disseminated, Cd-rich (up to 0.6 wt%), sphalerite (ZnS) mineralization in the northeastern part of the Jura Mountains, Switzerland. The Rb-Sr ages of sphalerite samples indicate that a main phase of sphalerite formation occurred near the boundary between the late Middle and early Late Jurassic, at around 162 Ma. The negative δ34S values (-22.3 to -5.3 ‰) suggest that biogenic sulfide sulfur was involved in ZnS precipitation. The strontium isotope composition is more radiogenic than that of contemporaneous seawater, reflecting the interaction of mineralizing fluids with silicate rocks. Lead isotope signatures are very uniform (206Pb/204Pb = 18.63-18.67, 207Pb/204Pb = 15.63-15.64, 208Pb/204Pb = 38.51-38.63), indicating an isotopically well-homogenized fluid system. The basement rocks underlying the Jurassic strata are considered to be the main source of metals for the sphalerite mineralization. The migration of deep-sourced hydrothermal saline metal-bearing fluids into the Bajocian host carbonates containing sedimentary reduced sulfur resulted in the precipitation of sulfides. The period of sphalerite formation near the Middle-Late Jurassic boundary is characterized by enhanced tectonic and hydrothermal activity in Europe, related to the opening of the Central Atlantic and tectonic/thermal subsidence during spreading of the Alpine Tethys. Our study provides evidence that the Bajocian carbonate rocks in the Jura Mountains area were affected by the circulation of deep-sourced metal-bearing hydrothermal fluids in response to these continent-wide tectonothermal events. The presence of sphalerite mineralization and associated geochemical anomalies in Zn and Cd contents in carbonate rocks may also be used to trace basement features. © 2014 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84900006543&doi=10.1007%2fs00531-014-1015-8&partnerID=40&md5=18fe4c2301db40e40fc179b28e626acc
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70472
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Institut des Sciences de la Terre, Université de Lausanne, 1015 Lausanne, Switzerland; Departement of Earth and Environmental Sciences, K. U. Leuven, Celestijnenlaan 200E, 3001 Heverlee, Belgium; Department of Mineralogy, Technische Universität Bergakademie Freiberg, Brennhausgasse 14, 09596 Freiburg, Germany; Département de Minéralogie, Université de Genève, 1205 Geneva, Switzerland
Recommended Citation:
Efimenko N.,Schneider J.,Spangenberg J.E.,et al. Formation and age of sphalerite mineralization in carbonate rocks of Bajocian age in the Swiss Jura Mountains: Evidence of Mesozoic hydrothermal activity[J]. International Journal of Earth Sciences,2014-01-01,103(4)