Publication Date:
2023-06-27
Description:
Fossil corals are unique archives of past seasonal climate variability, providing vital information about seasonal climate phenomena such as ENSO and monsoons. However, submarine diagenetic processes can potentially obscure the original climate signals and lead to false interpretations. Here we demonstrate the potential of laser ablation ICP-MS to rapidly detect secondary aragonite precipitates in fossil Porites colonies recovered by Integrated Ocean Drilling Program (IODP) Expedition 310 from submerged deglacial reefs off Tahiti. High resolution (100 µm) measurements of coralline B/Ca, Mg/Ca, S/Ca, and U/Ca ratios are used to distinguish areas of pristine skeleton from those afflicted with secondary aragonite. Measurements of coralline Sr/Ca, U/Ca and oxygen isotope ratios, from areas identified as pristine, reveal that the seasonal range of sea surface temperature in the tropical south Pacific during the last deglaciation (14.7 and 11 ka) was similar to that of today.
Keywords:
310-M0007B; 310-M0025B; Boron/Calcium ratio; DISTANCE; DP Hunter; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp310; Inductively coupled plasma - mass spectrometry (ICP-MS); Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Magnesium/Calcium ratio; Manganese/Calcium ratio; Mass spectrometry; Sample code/label; Sample code/label 2; Strontium/Calcium ratio; TAH-02A-5H; TAH-03A-3A; Tahiti, offshore Maraa; Tahiti, offshore Tiarei; Tahiti Sea Level; Uranium/Calcium ratio; δ13C, skeletal carbonate; δ18O, skeletal carbonate
Type:
Dataset
Format:
text/tab-separated-values, 1038 data points
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