Heavy metals in deltaic sediments of the Fraser River, British Columbia

1976 ◽  
Vol 13 (12) ◽  
pp. 1683-1693 ◽  
Author(s):  
D. A. Grieve ◽  
W. K. Fletcher
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Close Relationships ◽  
Fraser River ◽  
Sand Content ◽  
Sediment Texture ◽  
Delta Front ◽  
Fraser River Delta ◽  
Mn Content ◽  
High Concentrations

Co, Cu, Fe, Mn, Ni, Pb, and Zn, together with sand content and loss of ignition, have been determined for surflcial sediments from the Fraser River delta-front and upper foreslope. Both geochemical maps and statistical analysis disclose close relationships between trace-metal concentrations, sediment texture, and Fe and Mn content. Detailed studies of the distribution of labile and non-labile trace metals within sediments indicate that these relationships reflect increased concentrations of trace metals associated with both the detrital minerals and hydrous Fe oxides coatings in the finer fractions of the sediment. Abnormally high concentrations of labile trace metals are found on the tidal flats at two stations influenced by discharge of metal-rich sewage.

Substrates of the Strait of Georgia, British Columbia

1983 ◽  
Vol 40 (7) ◽  
pp. 1026-1032 ◽  
Author(s):  
J. L. Luternauer ◽  
J. J. Clague ◽  
C. H. Pharo
Keyword(s):  
British Columbia ◽  
Sea Level ◽  
Intertidal Zone ◽  
Fraser River ◽  
Pleistocene Glaciation ◽  
Delta Front ◽  
Strait Of Georgia ◽  
Local Wave ◽  
Fraser River Delta ◽  
Sand And Gravel

The subtidal floor of the Strait of Georgia west of the Fraser River Delta and north to Texada Island is blanketed mainly by silt and clay derived from the Fraser River and from failed deposits at the delta front. On the western part of the Strait south of the delta to the San Juan and Orcas islands, sediments are mainly lag sand and gravel eroded from Pleistocene deposits by strong tidal currents. East of this area in a more sheltered embayed part of the Strait the seafloor is covered by silt and clay derived from local mainland streams and possibly from the Fraser River. North of southern Texada Island, influence of the Fraser River also has been minimal. Although bottoms of basins in this part of the Strait are blanketed by mud, coarser sediments are dominant elsewhere. Substrate materials in the northern Strait are products of wave and current reworking of Pleistocene deposits and deposition from local streams and rivers. The shoreline of the Strait is mainly rocky but includes sand and/or gravel beaches and deltaic tidal flats. Development of the intertidal zone has been controlled by Pleistocene glaciation, postglacial changes in sea level, local wave and current regimes, and sediment availability.

Stability of the Fraser River Delta front

1983 ◽  
Vol 20 (4) ◽  
pp. 603-616 ◽  
Author(s):  
J. L. Luternauer ◽  
W. D. Liam Finn
Keyword(s):  
Main Channel ◽  
River Delta ◽  
Fraser River ◽  
The South ◽  
Delta Front ◽  
Sand Waves ◽  
Cyclic Mobility ◽  
The North ◽  
Fraser River Delta ◽  
Delta Slope

The distributary front deposits of the delta consist mainly of interlayered sand and silt and lie in one of the most seismically active zones in Canada. Subsurface deposits at the north tend to be siltier than those at the south. Sediments on the surface of the delta slope range from clayey silts at the north to pure sands at the south. Slope angles vary from 23° at the head of the slope to 1–2° within 2 km beyond the tidal flats.Hydraulic bedforms observed on the sandy slopes southeast of the main channel gradually increase in size from small ripples to large asymmetric sand waves 2–3 m high and approximately 30 m long. They are generated primarily by flood tidal currents which scour the seabed to a water depth in excess of 100 m.Formation of gullies which crease the delta slope probably is initiated principally by failure of oversteepened deposits at a channel mouth. Previous studies have suggested that the large hummocks or ridges at the base of the slope off the Main Channel have been formed by the compressional folding of failed deposits. Recent reflection seismic surveys suggest that such a process has recurred in this area during the growth of the delta.Interpretation of SPT data, in the light of recent research findings, suggests that previous analyses have overestimated failure potential. It is estimated that the slope may withstand an earthquake with a duration corresponding to approximately 15 significant cycles of motion and a peak acceleration in the range of 11–13% G. Keywords: stability, Fraser River Delta front, mass wasting, erosion, liquefaction potential, cyclic mobility.

Tide-supported gravity flows on the upper delta front, Fraser River delta, Canada

2012 ◽  
Vol 326-328 ◽  
pp. 166-170 ◽  
Author(s):  
Korhan Ayranci ◽  
D. Gwyn Lintern ◽  
Philip R. Hill ◽  
Shahin E. Dashtgard
Keyword(s):  
River Delta ◽  
Fraser River ◽  
Delta Front ◽  
Gravity Flows ◽  
Fraser River Delta

Schwermetalle in höheren Pilzen Cadmium, Zink und Kupfer Heavy Metals in Higher Fungi Cadmium, Zinc, and Copper

1977 ◽  
Vol 32 (3-4) ◽  
pp. 172-181 ◽  
Author(s):  
Hans-Ulrich Meisch ◽  
Johannes A. Schmitt ◽  
Wolfgang Reinle
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Atomic Absorption ◽  
Atomic Absorption Spectroscopy ◽  
The Other ◽  
Special Value ◽  
Taxonomic Criterion ◽  
High Concentrations ◽  
Taxonomic Groups ◽  
Cadmium Zinc

Abstract In a series of 190 samples, higher fungi, especially from the genus Agaricus, were analyzed by atomic absorption spectroscopy on their content of the trace metals cadmium, zinc, and copper. Cd was found to be present in high concentrations in some Agaricus species belonging to special taxonomic groups. In relation to soil concentrations, Cd is highly enriched in some Agaricus spec., the enrichment being a taxonomic criterion of special value. Among the remaining genera of higher fungi, only Leucoagaricus and Amanita showed similiar enrichment properties for cadmium. The chemically related metals Zn and Cu were found to be relative uniformely distributed in all analyzed fungi. No synergistic or antagonistic relationship between Cd and the other two metals could be detected in the mushrooms.

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