The Minor Element Endowment of Modern Sea-Floor Massive Sulfides and Comparison with Deposits Hosted in Ancient Volcanic Successions

2016 ◽  
Author(s):  
Thomas Monecke ◽  
Sven Petersen ◽  
Mark D. Hannington ◽  
Hannah Grant ◽  
Iain M. Samson
Keyword(s):  
Minor Element ◽  
Massive Sulfides ◽  
Sea Floor

Sphalerite composition in relation to deposition and metamorphism of the Foss stratiform Ba-Zn-Pb deposit, Aberfeldy, Scotland

1983 ◽  
Vol 47 (345) ◽  
pp. 487-500 ◽  
Author(s):  
Norman R. Moles
Keyword(s):  
Hydrothermal Vents ◽  
Regional Metamorphism ◽  
Minor Element ◽  
Depositional Environments ◽  
Outward Diffusion ◽  
Sea Floor ◽  
Scottish Highlands ◽  
Metal Deposit ◽  
Wide Range ◽  
Mineralogical Evidence

AbstractSphalerite is a common constituent of the mineralized rocks and host metasediments of the Foss baryte-base metal deposit, located near Aberfeldy in the central Scottish Highlands. Microprobe analyses of sphalerite show a wide range in minor element content (0–17 mol. % FeS, 0–3 mol. % MnS), and sphalerites of contrasting composition are often found in the same rock. This suggests that equilibrium domains in some rocks were minute (< 1 mm), during regional metamorphism. Pressures derived from the selective application of the sphalerite geobarometer are consistent with other mineralogical evidence of peak metamorphic pressures in the range 7–10 kbar, at 540–580 °C. However, there is considerable evidence of partial retrograde re-equilibration of sphalerite, by continued buffering with pyrite+ pyrrhotine and by outward diffusion of iron. Marginal depletion of Fe and Mn in sphalerite within coarse carbonate rocks is attributed to partitioning reactions following recrystallization. Sphalerite which has retained its pre-metamorphic composition shows systematic variations in composition through profiles of mineralized beds, which may be related to depositional environments. Bimodal primary compositions can be explained by precipitation of zinc sulphides under the contrasting chemical environments of hydrothermal vents and cooler, exhaled brine layers on the sea floor.

The Sea Floor

1993 ◽  
Author(s):  
Eugen Seibold ◽  
Wolfgang H. Berger
Keyword(s):  
Sea Floor

Sea-Floor Mapping and Benthic Habitat GIS for the Elwha River Delta Nearshore, Washington

Data Series ◽  
10.3133/ds320 ◽  
2008 ◽  
Author(s):  
Guy R. Cochrane ◽  
Jonathan A. Warrick ◽  
Yael Sagy ◽  
David Finlayson ◽  
Jodi Harney
Keyword(s):  
River Delta ◽  
Benthic Habitat ◽  
Elwha River ◽  
Sea Floor ◽  
Sea Floor Mapping
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