scholarly journals Distribution of branched GDGTs in surface sediments from the Colville River, Alaska: Implications for the MBT′/CBT paleothermometer in Arctic marine sediments

2016 ◽  
Vol 121 (7) ◽  
pp. 1762-1780 ◽  
Author(s):  
Andrea J. M. Hanna ◽  
Timothy M. Shanahan ◽  
Mead A. Allison
Keyword(s):  
Marine Sediments ◽  
Surface Sediments ◽  
Colville River

An improved alpha scintillation counting method for determination of Th, U, Ra-226, Th-230 excess, and Pa-231 excess in marine sediments

1986 ◽  
Vol 23 (7) ◽  
pp. 959-966 ◽  
Author(s):  
D. J. Huntley ◽  
M. K. Nissen ◽  
J. Thomson ◽  
S. E. Calvert
Keyword(s):  
Marine Sediments ◽  
Deep Sea ◽  
Borate Glass ◽  
Surface Sediments ◽  
Scintillation Counting ◽  
Sedimentation Rates ◽  
Counting Method ◽  
Near Surface ◽  
Thick Source

In a previous paper it was shown that thick-source α counting is a simple means for determining Th, U, Th-230 excess, and Pa-231 excess concentrations, and hence sedimentation rates, for deep-sea sediments. Here it is shown that radon escape can lead to inaccurate results if powdered samples are used and that this problem can be overcome by preparing samples as a borate glass before measurement. Glassed samples also permit a novel measurement of the Ra-226 content by measurement of the post-fusion buildup of Rn-222, a determination shown to be necessary for near-surface sediments that have a deficit of Ra-226. It is also shown that Po-210 is lost during the fusion and that this loss can be allowed for in the calculations.The above observations are found on comparisons of measured and calculated α count rates for several Th and U standards and on comparisons with α spectrometry results from four sets of deep-sea core samples.

Terrigenous Organic Matter in Surface Sediments from the Gulf of St. Lawrence

1976 ◽  
Vol 33 (1) ◽  
pp. 93-97 ◽  
Author(s):  
Roger Pocklington
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Marine Sediments ◽  
Carbon Concentration ◽  
Surface Sediments ◽  
Pulp And Paper ◽  
Pulp And Paper Mills ◽  
Paper Mills ◽  
Organic Carbon Concentration ◽  
Close Proximity

Marine sediments containing land-derived organic matter can be identified by a combination of high organic carbon concentration, high C and H relative to N, and the presence of lignin. Sediments with this combination of characteristics have been found in certain environments within the Gulf of St. Lawrence, in particular, in close proximity to pulp and paper mills.

scholarly journals Sources of terrigenous inputs to surface sediments of the Colville River Delta and Simpson's Lagoon, Beaufort Sea, Alaska

2013 ◽  
Vol 118 (2) ◽  
pp. 808-824 ◽  
Author(s):  
Kathryn M. Schreiner ◽  
Thomas S. Bianchi ◽  
Timothy I. Eglinton ◽  
Mead A. Allison ◽  
Andrea J. M. Hanna
Keyword(s):  
Surface Sediments ◽  
Beaufort Sea ◽  
River Delta ◽  
Colville River

Diatoms and aquatic palynomorphs in the sediments of the Eurasian Arctic seas and their significance for paleooceanological investigations in the Arctic

2019 ◽  
pp. 246-251
Author(s):  
Yelena I. Polyakova ◽  
Yekaterina I. Novichkova ◽  
Tatiana S. Klyuvitkina ◽  
Elizaveta A. Agafonova ◽  
Irina M. Kryukova
Keyword(s):  
Bering Sea ◽  
Surface Sediments ◽  
Sea Water ◽  
The Arctic ◽  
Marginal Filter ◽  
Arctic Seas ◽  
Hydrological Parameters ◽  
The Arctic Ocean ◽  
Long Term Studies

Presented the results of long-term studies of diatoms and aquatic palynomorphs in surface sediments of the Arctic seas and the possibility of their use for the reconstructions of paleocirculation water masses, advection of Atlantic and Bering sea water into the Arctic ocean, changes in the river runoff to the seas, sedimentary processes in the marginal filter of the largest rivers, seasonal sea ice cover and other hydrological parameters.

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