scholarly journals Late-glacial and early Holocene lake sediments, ground-water formation and climate in the Atacama Altiplano 22?24�S

1995 ◽  
Vol 14 (3) ◽  
pp. 241-252 ◽  
Author(s):  
Martin Grosjean ◽  
Mebus A. Geyh ◽  
Bruno Messerli ◽  
Ueli Schotterer

2020 ◽  
Author(s):  
Jenifer A. Leidelmeijer ◽  
◽  
Matthew E. Kirby ◽  
Glen Sproul dit MacDonald ◽  
Joseph Carlin ◽  
...  


Rhodora ◽  
2007 ◽  
Vol 109 (938) ◽  
pp. 225-229
Author(s):  
W. Wyatt Oswald ◽  
Barbara C. S. Hansen ◽  
David R. Foster


2016 ◽  
Author(s):  
Kevin Q. Nguyen ◽  
◽  
Elizabeth K. Thomas ◽  
Isla S. Castañeda ◽  
Jason P. Briner ◽  
...  


2008 ◽  
Vol 40 (3) ◽  
pp. 497-505 ◽  
Author(s):  
H. D. Kokorowski ◽  
P. M. Anderson ◽  
R. S. Sletten ◽  
A. V. Lozhkin ◽  
T. A. Brown


1998 ◽  
Vol 44 ◽  
pp. 173-179
Author(s):  
C. Israelson ◽  
S. Bjorck ◽  
N. Noe Nygaard ◽  
C. J. Hawkesworth

We report the results of a U-series isotope study on Eemian lake sediments from Hollerup, western Denmark. The purpose is to examine the possibility of dating these, and similar, sediments with the 238U-23"h method. Two sedimentary facies were studied; carbonate-present, and virtually carbonate-free but organic-rich sediments. All carbonate-present sediments (5-95%) have (230ThP38U) values higher than unity and relatively radiogenic (23"W232Th) values between 2 and 6.5, indicating postdeposition removal of U, probably by percolation of ground water. Carbonate-free sediments, but with high organic content (40-60%) had (230Th/238U) values lower than 1 and 'model ages' between 89 and 199 ky. The large spread in ages and variation in U content for these sediment samples that were deposited over a much shorter time interval, indicate a complex postdepositional migration pattern of U, probably involving several episodes of leaching and absorption of U from ground water. Our results suggest that lake sediments, such as those found in Hollerup, are vulnerable to mobilization of U and its decay products and care should be taken when interpreting U-series disequilibrium data from such sediments. Future studies will concentrate on sediments that have been more deeply buried andor are less compacted and sealed from percolation of oxidized groundwater.





2009 ◽  
pp. 89-94 ◽  
Author(s):  
Fabio Martini ◽  
Andre Carlo Colonese ◽  
Zelia di Giuseppe ◽  
Massimiliano Ghinassi ◽  
Domenico Lo Vetro ◽  
...  


Quaternaire ◽  
2006 ◽  
pp. 31-42 ◽  
Author(s):  
E. R. Garnett ◽  
J. E. Andrews ◽  
Richard C. Preece ◽  
P. F. Dennis


2020 ◽  
Vol 233 ◽  
pp. 106239 ◽  
Author(s):  
Mateusz Baca ◽  
Danijela Popović ◽  
Katarzyna Baca ◽  
Anna Lemanik ◽  
Karolina Doan ◽  
...  


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