文摘
A novel methodological approach for ultra-high resolution LA-ICPMS analysis to resolve daily growth in giant clams. < 10 µm daily variability in B/Ca, Mg/Ca, Sr/Ca and Ba/Ca is resolved in Miocene and modern Tridacna shells. Longer-term LA-ICPMS records reveal Miocene fortnightly (tidal) and seasonal periodicities. Image processing analysis indicates a coupling between the geochemical composition and the incremental growth pattern. LA-ICPMS analysis facilitates rapid acquisition of longer-term (deep-time) palaeoenvironmental records at daily resolution.