Dissolved and particulate trace metal geochemistry in the scheldt estuary, S. W. Netherlands (water column and sediments)

1993 ◽  
Vol 27 (2-4) ◽  
pp. 287-300 ◽  
Author(s):  
J. J. G. Zwolsman ◽  
G. T. M. Eck
Keyword(s):  
Trace Metal ◽  
Water Column ◽  
Scheldt Estuary ◽  
Metal Geochemistry

Sedimentological and diagenetical conditions of the impact level of the Cretaceous/Tertiary boundary in Tunisia; no anoxia required

2000 ◽  
Vol 171 (6) ◽  
pp. 629-636 ◽  
Author(s):  
Nicolas Tribovillard ◽  
Christian Dupuis ◽  
Eric Robin
Keyword(s):  
Trace Metal ◽  
Water Column ◽  
Mass Extinctions ◽  
Boundary Trace ◽  
The Impact ◽  
Metal Geochemistry

Abstract The Ain Settara section (Kalaat-Senan area, Tunisia) shows a well-exposed and expanded Cretaceous/Tertiary (K/T) boundary that can be divided into several units of contrasted lithologies. The bolide impact level is identified thanks to the occurrence of a peak of iridium and Ni-rich spinel abundance. The impact level is a jarosite nodule-rich horizon upon which the emphasis is placed: the jarosite nodules, initially present as pyrite nodules, may be interpreted as reflecting reducing depositional conditions at the K/T boundary. Trace metal geochemistry indicates that depositional conditions were not reducing and that the nodules must not have formed during earliest diagenesis. Consequently, water column-scaled anoxia cannot be put forward to account for the mass extinctions observed at the K/T boundary at Ain Settara.

scholarly journals Modern proteomes contain putative imprints of ancient shifts in trace metal geochemistry

2006 ◽  
Vol 103 (47) ◽  
pp. 17822-17827 ◽  
Author(s):  
C. L. Dupont ◽  
S. Yang ◽  
B. Palenik ◽  
P. E. Bourne
Keyword(s):  
Trace Metal ◽  
Metal Geochemistry

Modern proteomes contain putative imprints of ancient shifts in trace metal geochemistry

SciVee ◽  
2007 ◽  
Author(s):  
Christopher Dupont ◽  
Song Yang ◽  
Brian Palenik ◽  
Philip Bourne
Keyword(s):  
Trace Metal ◽  
Metal Geochemistry

The trace-metal geochemistry of the Lake Tyrrell system brines (Victoria, Australia)

1992 ◽  
Vol 96 (1-2) ◽  
pp. 115-132 ◽  
Author(s):  
W.Berry Lyons ◽  
Susan Welch ◽  
David T. Long ◽  
Mark E. Hines ◽  
Angela M. Giblin ◽  
...  
Keyword(s):  
Trace Metal ◽  
Metal Geochemistry

Trace metal dynamics in the water column and pore waters in a temperate tidal system: response to the fate of algae-derived organic matter

2009 ◽  
Vol 59 (2) ◽  
pp. 333-350 ◽  
Author(s):  
Nicole Kowalski ◽  
Olaf Dellwig ◽  
Melanie Beck ◽  
Maik Grunwald ◽  
Sibylle Fischer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Trace Metal ◽  
Water Column ◽  
System Response ◽  
Pore Waters

Sedimentation in the Göta älv estuary (Göteborg harbour): Trace‐metal geochemistry

GFF ◽  
1996 ◽  
Vol 118 (sup004) ◽  
pp. 86-86
Author(s):  
L. Engström ◽  
H. Alexanderson ◽  
R.L. Stevens
Keyword(s):  
Trace Metal ◽  
Metal Geochemistry

Trace metal geochemistry in the Cariaco Trench

1987 ◽  
Vol 34 (5-6) ◽  
pp. 965-981 ◽  
Author(s):  
Lucinda Jacobs ◽  
Steven Emerson ◽  
Sarah S. Huested
Keyword(s):  
Trace Metal ◽  
Metal Geochemistry

Validating the Use of Radiotracers as Analogs of Stable Metal Behaviour in Enclosed Aquatic Ecosystem Experiments

1987 ◽  
Vol 44 (S1) ◽  
pp. s251-s259 ◽  
Author(s):  
Robert F. Anderson ◽  
Peter H. Santschi ◽  
Urs P. Nyffeler ◽  
Sherry L. Schiff
Keyword(s):  
Trace Metal ◽  
Water Column ◽  
Metal Removal ◽  
Chemical Properties ◽  
Ionic Form ◽  
Experimental Lakes Area ◽  
Suspended Particulate ◽  
Area North ◽  
Exchange Resins ◽  
Physical And Chemical

Radiotracer experiments were carried out in enclosures in two lakes at the Experimental Lakes Area, North-western Ontario, to study the pathways of trace metal removal from the shallow water columns to the sediments of these lakes. As part of the larger experiment, stable carriers of Fe, Mn, and Zn were added individually to each of three enclosures. Rates of removal to sediments at pH 6.3 and backdiffusion after HCl addition to pH 4.8 of radiotracer 59Fe, 54Mn, and 65Zn were compared to the respective rates of their stable counterparts. Tracer removal and backdiffusion rates in enclosures which received stable carrier additions were further compared with the tracer behaviour in enclosures which received no carrier additions. Radiotracers and stable carriers were removed from the water column at similar rates at pH 6.3, and were remobilized at similar rates from the sediments when the pH of the water column was lowered to 4.8. The presence of the added stable carriers had no effect on the removal or remobilization of Mn or Zn. However, the removal of 59Fe from the water column was slowed slightly by the addition of Fe(III) carrier compared to removal in the other tubes, possibly due to the formation of colloidal phases. These results show that information on the rates of trace metal transport obtained using radiotracers is applicable to stable metal behavior in these freshwater systems. The use of radiotracers to study trace metal geochemistry under natural conditions is preferred to the addition of stable metals which may alter the physical and chemical properties of the suspended particulate matter as occurred after the addition of stable iron. Speciation studies showed that adsorption to ion exchange resins does not provide a reliable indication of the ionic form of metals in lake water.

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