Daily growth and tidal rhythms in Miocene and modern giant clams revealed via ultra-high resolution LA-ICPMS analysis — A novel methodological approach towards improved sclerochemistry (Englisch)

In: Palaeogeography, Palaeoclimatology, Palaeoecology   ;  465 ;  362-375  ;  2016
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Abstract We present a novel approach for ultra-high resolution laser-ablation inductively-coupled-plasma mass spectrometry (LA-ICPMS) analysis, which not only allows us to clearly resolve <10μm (daily) compositional variability in B/Ca, Mg/Ca, Sr/Ca and Ba/Ca, but also to detect long-term tidal and seasonal cycles in both Miocene and modern Tridacna (giant clam) shells. Daily element/Ca variability preserved within microscopically visible growth increments is resolved by utilizing the combined capabilities of a rotating rectangular aperture (spot size on target 4×50μm), the rapid signal washout of a Laurin two-volume laser ablation cell and slow compositional profiling (≤1.5μm/s). Striking co-variation between oscillating cycles in B/Ca, Mg/Ca, Sr/Ca and Ba/Ca is discernible, yet also tantalizingly, sub-daily shifts between these element/Ca ratios can be observed. In comparison to a lower-resolution, seasonally-resolved δ18O–Mg/Ca record (Warter et al., 2015), the ~10–20μm element/Ca cycles are determined to be daily in origin, and a further ~14–15day cyclicity is superimposed on the daily cycles. The latter is interpreted to reflect (Miocene) tidal periodicity. Changes in pixel intensity during thin section observation associated with micro- and macroscopically visible low and high density bands have been quantified via image processing analysis. This reveals close correspondence to the measured trace elemental cyclicity, indicating a coupling between the geochemical composition of the shell and the incremental growth pattern. A comparison between the elemental and image processing results reveals that ultra-high-resolution LA-ICPMS analysis surpasses the latter in detecting environmental rhythms, including daily and tidal cycles. Highly-resolved LA-ICPMS analysis is a viable alternative to nanoSIMS and opens up routine investigation of long-term (deep-time) paleoenvironmental records at daily resolution.

Highlights A novel methodological approach for ultra-high resolution LA-ICPMS analysis to resolve daily growth in giant clams. <10µm 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.

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