El Niño Impact on Mollusk Biomineralization–Implications for Trace Element Proxy Reconstructions and the Paleo-Archeological Record
Figure 3
Profiles of Mg/Ca, Sr/Ca and Ba/Ca variability in shell transects of 2TP4-2 specimen during (DEN), at the transition zone – scar (MTA), and after (AEN) the 1982–1983 El Niño event.
(A) Image of the shell in longitudinal section showing the location of transects, and some individual measurements as a reference, for each transect. (B) outer layer transect; (C) middle layer transect; (D) inner layer transect. [Sr/Ca - black solid line, Mg/Ca - grey solid line, and Ba/Ca – grey dashed line; number of individual measurements marked by solid squares (transect 1– outer layer), solid diamonds (transect 2– middle layer), and solid circles (transect 3– inner layer) for Mg/Ca and Sr/Ca, and solid triangles for Ba/Ca in all transects; mmol/mol units in all ‘y’ axes; error is <0.6% for all elemental ratios].