Sedimentary Phosphate Fractions Related to Calcite Precipitation in an Eutrophic Hardwater Lake (Lake Alserio, Northern Italy)

2006 ◽  
Vol 35 (1) ◽  
pp. 55-64 ◽  
Author(s):  
I. de Vicente ◽  
K. Cattaneo ◽  
L. Cruz-Pizarro ◽  
A. Brauer ◽  
P. Guilizzoni
2020 ◽  
Author(s):  
C.-C. (River) Shen ◽  
Hsun-Ming Hu ◽  
Véronique Michel ◽  
Patricia Valensi ◽  
Horng-Sheng Mii ◽  
...  

<p>We here present new <sup>230</sup>Th-dated stalagmite multi-proxy records from Toirano cave (44˚ N, 8˚E), northern Italy, characterized by a semi-arid Mediterranean climate with humid winters and dry summers. Eleven U-Th ages was used to build the regional hydroclimate evolution over the past 800 years. Sr/Ca and Ba/Ca records show a similar pattern with an increasing trend at the end of Medieval Warm Period (MWP; 950-1250 C.E.) and a decreasing trend at the inception of Little Ice Age (LIA; 1300 to 1800 C.E). The temperature effect on the Sr partition coefficient in calcite is negligible and no significant influence of deposition rate on Sr/Ca and Ba/Ca is observed. The high degree of co-variation between the two records (r = 0.91; n = 212) suggest the variation should be mainly governed by prior calcite precipitation (PCP). Dry conditions lead to a longer water residence time in the epikarst, enhanced CO<sub>2</sub> degassing and decreasing drip rate, resulting in high Sr/Ca and Ba/Ca ratios due to the preferential removal of Ca during PCP. Our results suggest a dry period during the transition of MCA and LIA in our region.</p>


2001 ◽  
Vol 120 (5) ◽  
pp. A366-A366
Author(s):  
C MAZZEO ◽  
F AZZAROLI ◽  
A COLECCHIA ◽  
S DISILVIO ◽  
A DORMI ◽  
...  

2011 ◽  
Vol 38 (S 01) ◽  
Author(s):  
D Pucci ◽  
F Amaddeo ◽  
A Rossi ◽  
G Rezvy ◽  
R Olstad ◽  
...  

2015 ◽  
Vol 35 ◽  
pp. 21-24 ◽  
Author(s):  
Tullia Bonomi ◽  
Letizia Fumagalli ◽  
Gennaro A. Stefania ◽  
Marco Rotiroti ◽  
Federica Pellicioli ◽  
...  

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