(Table 1) Comparison between bulk ICP-OES measurements and LA-ICP-MS analyses for Mg/Ca and Sr/Ca ratios of Globigerinoides sacculifer from ODP Hole 165-1000A ...

We constructed a high-resolution Mg/Ca record on the planktonic foraminifer Globigerinoides sacculifer in order to explore the change in sea surface temperature (SST) due to the shoaling of the Isthmus of Panama as well as the impact of secondary factors like diagenesis and large salinity fluctuatio...

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Bibliographic Details
Main Author: Groeneveld, Jeroen
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
Sample code/label
DEPTH, sediment/rock
AGE
Comment
Number of profiles
Number
Magnesium/Calcium ratio
Strontium/Calcium ratio
Drilling/drill rig
ICP-OES, Inductively coupled plasma - optical emission spectrometry
LA-ICP-MS, Laser-ablation inductively coupled plasma mass spectrometer
Leg165
Joides Resolution
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158
Antarctic
Arctic
Gateway The
Pacific
Antarc*
Foraminifera*
Sea ice
Online Access:https://dx.doi.org/10.1594/pangaea.847982
https://doi.pangaea.de/10.1594/PANGAEA.847982
Description
Summary:We constructed a high-resolution Mg/Ca record on the planktonic foraminifer Globigerinoides sacculifer in order to explore the change in sea surface temperature (SST) due to the shoaling of the Isthmus of Panama as well as the impact of secondary factors like diagenesis and large salinity fluctuations. The study covers the latest Miocene and the early Pliocene (5.6-3.9 Ma) and was combined with d18O to isolate changes in sea surface salinity (SSS). Before 4.5 Ma, SSTMg/Ca and SSS show moderate fluctuations, indicating a free exchange of surface ocean water masses between the Pacific and the Atlantic. The increase in d18O after 4.5 Ma represents increasing salinities in the Caribbean due to the progressive closure of the Panamanian Gateway. The increase in Mg/Ca toward values of maximum 7 mmol/mol suggests that secondary influences have played a significant role. Evidence of crystalline overgrowths on the foraminiferal tests in correlation with aragonite, Sr/Ca, and productivity cyclicities indicates a ... : Average results are shown from multiple ablation profiles through cleaned G. sacculifer tests from two contaminated, with crystalline overgrowths, samples (14-5-115 and 14-5-125) and two uncontaminated, without crystalline overgrowths, samples (14-5-95 and 14-5-145). The calculated Mg/Ca ratios derived from the LA-ICP-MS measurements agree, within the method standard deviation of 5-10%, to the whole-test ICP-OES measurements performed on the same samples. ...

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