A geochemical study of metalliferous sediment from the TAG Hydrothermal Mound, 26°08′N, Mid-Atlantic Ridge

1993 ◽  
Vol 98 (B6) ◽  
pp. 9683 ◽  
Author(s):  
C. R. German ◽  
N. C. Higgs ◽  
J. Thomson ◽  
R. Mills ◽  
H. Elderfield ◽  
...  
Keyword(s):  
Metalliferous Sediment ◽  
Geochemical Study ◽  
Mid Atlantic Ridge

scholarly journals Geochemical Fractions of Heavy Metals in Bottom Sediments of the Pobeda Hydrothermal Field, Mid-Atlantic Ridge (17°07′–17°08′ N)

2021 ◽  
Vol 6 (1) ◽  
pp. 14
Author(s):  
Liudmila Demina ◽  
Irina Gablina ◽  
Olga Dara ◽  
Dmitry Budko ◽  
Nina Gorkova ◽  
...  
Keyword(s):  
Total Content ◽  
Element Distribution ◽  
Hydrothermal Field ◽  
Residual Fraction ◽  
Carbonate Sediments ◽  
Metalliferous Sediments ◽  
Geochemical Fractions ◽  
Metalliferous Sediment ◽  
Fe And Mn ◽  
Mid Atlantic Ridge

We examined the distribution of Fe, Mn, Cu, Zn, and Pb in one core of metalliferous, and one core of non-mineralized (background) carbonate sediments (located 69 km northwards), from the Pobeda hydrothermal field. Mechanisms of metal accumulation in sediments (12 samples) were evaluated based on sequential extraction of geochemical fractions, including mobile (exchangeable complex, authigenic Fe-Mn hydroxides, and sulfides), and lithogenic (fixed in crystalline lattices) forms. Maps of element distribution in sediment components were obtained using a scanning electron microscope equipped with an energy-dispersive spectrometry detector. In metalliferous sediments, according to X-ray diffraction data, the main Fe mineral phase was goethite FeOOH (37–44% on a carbonate-free basis). The contents of Fe and Mn reached 31.6 and 0.18%, respectively, whereas concentrations of Cu, Zn and Pb were 0.98, 0.36, and 0.059%. The coefficient of metal enrichment relative to background values varied from 16 to 125 times. The exception was Mn, for which no increased accumulation was recorded. Essential mass of Fe (up to 70% of total content) was represented by the residual fraction composed of crystallized goethite, aluminosilicates, the minerals derived from bedrock destruction processes. Among geochemically mobile fractions, 90–97% of total Fe was found in the form of authigenic oxyhydroxides. The same fraction was the predominant host for Mn in both metalliferous and background sediments (55–85%). A total of 40–96 % of Cd, Cu, Zn, and Pb were associated with these Fe and Mn fractions. The sulfide fraction amounted to roughly 10% of each metal. In metalliferous sediment core, the maximum concentrations of metals and their geochemically mobile fractions were recorded in deeper core intercepts, an observation that might be attributed to influence of hydrothermal diffused fluids. Our data suggested that metals are mostly accumulated in carbonate sediments in their contact zone with the underlying serpentinized basalts.

The oldest seafloor massive sulfide deposits at the Mid-Atlantic Ridge: 230Th/U chronology and composition

2015 ◽  
Vol 42 (1) ◽  
Author(s):  
Vladislav Kuznetsov ◽  
Eriks Tabuns ◽  
Kathrine Kuksa ◽  
Georgy Cherkashov ◽  
Fedor Maksimov ◽  
...  
Keyword(s):  
Massive Sulfide ◽  
Hydrothermal Activity ◽  
Ocean Floor ◽  
Hydrothermal Field ◽  
Sulfide Deposits ◽  
Massive Sulfides ◽  
Geochemical Properties ◽  
Geochemical Study ◽  
Mid Atlantic Ridge ◽  
Seafloor Massive Sulfide

Abstract A geochronological and geochemical study on 10 samples of seafloor massive sulfides (SMS) from the inactive Peterburgskoye hydrothermal field at the Mid-Atlantic Ridge (MAR) was carried out. The 230Th/U ages of the SMS are the oldest for the Quaternary hydrothermal ores ever found at the ocean floor. According to them the hydrothermal activity at Peterburgskoye field started at least 170 ka and continued down to 63 ka. The oldest hydrothermal ores from this field consist mainly of pyrite and chalcopyrite and have geochemical properties typical for SMS associated with basalts.

History and geochemistry of a metalliferous sediment core from the Mid-Atlantic Ridge at 26°N

1988 ◽  
Vol 52 (10) ◽  
pp. 2369-2378 ◽  
Author(s):  
Simone Metz ◽  
John H. Trefry ◽  
Terry A. Nelsen
Keyword(s):  
Sediment Core ◽  
Metalliferous Sediment ◽  
Mid Atlantic Ridge

Diversity of Bacteria and Archaea associated with a carbonate-rich metalliferous sediment sample from the Rainbow vent field on the Mid-Atlantic Ridge

2005 ◽  
Vol 7 (5) ◽  
pp. 698-714 ◽  
Author(s):  
Olivier Nercessian ◽  
Yves Fouquet ◽  
Catherine Pierre ◽  
Daniel Prieur ◽  
Christian Jeanthon
Keyword(s):  
Sediment Sample ◽  
Metalliferous Sediment ◽  
Mid Atlantic Ridge

A dual origin for the hydrothermal component in a metalliferous sediment core from the Mid-Atlantic Ridge

1993 ◽  
Vol 98 (B6) ◽  
pp. 9671 ◽  
Author(s):  
Rachel Mills ◽  
Henry Elderfield ◽  
John Thomson
Keyword(s):  
Sediment Core ◽  
Metalliferous Sediment ◽  
Mid Atlantic Ridge ◽  
Dual Origin

Toarcian-Bathonian palynostratigraphy and anoxic event in Pakistan: An organic geochemical study

Stratigraphy ◽  
2018 ◽  
Vol 15 (3) ◽  
pp. 225-243 ◽  
Author(s):  
Fahad Ali ◽  
Sajjad Ahmad ◽  
Suleman Khan ◽  
Muhammad Hanif ◽  
Jin Qiang
Keyword(s):  
Geochemical Study ◽  
Anoxic Event

Preliminary geochemical study of ash-flow tuffs in the Morococala and Los Frailes volcanic fields, central Bolivian tin belt

1985 ◽  
Author(s):  
G.E. Ericksen ◽  
R.L. Smith ◽  
R.G. Luedke ◽  
Mario Flores ◽  
Alfredo Espinosa ◽  
...  
Keyword(s):  
Geochemical Study ◽  
Volcanic Fields
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