Publication Date:
2021-01-05
Description:
The stable isotope composition of living and of Holocene Mytilidae shells was measured
in the area of Camarones (Chubut, Argentina). The most striking results were the high 18O values
measured in samples older than ca. 6.1 cal ka BP. In the younger samples, the 18O values remained
substantially stable and similar to those of living specimens. Analysis of the data revealed the
possibility for this isotopic shift to be driven mainly by changes in temperature probably accompanied
by minor changes in salinity, suggesting cooler seawater before 6.1 cal ka BP, with a maximum possible
temperature shift of ca. 5 C. A possible explanation of this change can be related to a northward
position of the confluence zone of the Falkland and Brazilian currents. This is consistent with the data
obtained in marine cores, which indicate a northerly position of the confluence in the first half of the
Holocene. Our data are also in line with the changes in wind strength and position of the Southern
WesterliesWind, as reconstructed in terrestrial proxies from the Southernmost Patagonia region.
Description:
Published
Description:
3464
Description:
5A. Ricerche polari e paleoclima
Description:
JCR Journal
Keywords:
Patagonian coast
;
mollusk shells
;
Holocene
;
stable isotopes
;
Palaeoceanography of Chubut coast during the Holocene
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
