(Tables 2, 3) Element ratios of planktonic foraminifera from western Pacific surface sediments
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2006
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| _version_ | 1867169092564156416 |
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| author | Mekik, Figen Francois, Roger |
| author_facet | Mekik, Figen Francois, Roger |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Accurately quantifying deep-sea calcite dissolution is crucial for understanding the role of the marine carbonate system in regulating atmospheric pCO2 over millennia. We compare a foraminifer-fragmentation-based calcite dissolution proxy (Globorotalia menardii fragmentation index (MFI)) to Mg/Ca, Sr/Ca, and Mg/Sr in several species of deep dwelling planktonic foraminifers. We conducted microfossil and geochemical analyses on the same core top samples taken at different depths on the Ontong Java Plateau to maximize the dissolution signal and minimize the temperature overprint on our data. We also compare elemental ratios from planktonic foraminifer tests to modern bottom water [CO3]2- undersaturation and model-derived estimates of percent calcite dissolved in deep-sea sediments. We find clear linear decreases in Mg/Ca or Mg/Sr in G. menardii and Pulleniatina obliquiloculata with increasing (1) bottom water [CO3]2- undersaturation, (2) percent calcite dissolved in sediments calculated with biogeochemical modeling, (3) MFI, and (4) percent calcite dissolved derived from MFI. These findings lend further support to MFI as a calcite dissolution proxy for deep-sea sediments. In contrast, we find no significant correlation between Sr/Ca and independent dissolution indicators. Our results suggest that Mg/Ca and Mg/Sr from deep dwelling foraminifers could potentially be used as calcite dissolution proxies in combination with independent water temperature estimates. Likewise, establishing the relationship between MFI and dissolution-induced changes in the Mg/Ca of surface-dwelling foraminifers could provide a tool to correct Mg/Ca–derived sea surface temperature reconstructions for calcite dissolution. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_832902 |
| institution | PANGAEA |
| language | en |
| publishDate | 2006 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Tables 2, 3) Element ratios of planktonic foraminifera from western Pacific surface sediments Mekik, Figen Francois, Roger DEPTH, sediment/rock; Elevation of event; ERDC; ERDC-089P; ERDC-090G; ERDC-098G; ERDC-109G; ERDC-110G; ERDC-111G; ERDC-114G; ERDC-115G; ERDC-116G; ERDC-118G; ERDC-121G; ERDC-126G; ERDC-127P; ERDC-130P; ERDC-132P; Event label; GC; Globorotalia menardii; Globorotalia menardii, Magnesium/Calcium ratio; Globorotalia tumida; Globorotalia tumida, Magnesium/Calcium ratio; Gravity corer; Latitude of event; Longitude of event; Magnesium/Calcium ratio, standard deviation; Magnesium/Strontium ratio; Magnesium/Strontium ratio, standard deviation; Neogloboquadrina dutertrei; Neogloboquadrina dutertrei, Magnesium/Calcium ratio; PC; Piston corer; Pulleniatina obliquiloculata; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Strontium/Calcium ratio; Thomas Washington Accurately quantifying deep-sea calcite dissolution is crucial for understanding the role of the marine carbonate system in regulating atmospheric pCO2 over millennia. We compare a foraminifer-fragmentation-based calcite dissolution proxy (Globorotalia menardii fragmentation index (MFI)) to Mg/Ca, Sr/Ca, and Mg/Sr in several species of deep dwelling planktonic foraminifers. We conducted microfossil and geochemical analyses on the same core top samples taken at different depths on the Ontong Java Plateau to maximize the dissolution signal and minimize the temperature overprint on our data. We also compare elemental ratios from planktonic foraminifer tests to modern bottom water [CO3]2- undersaturation and model-derived estimates of percent calcite dissolved in deep-sea sediments. We find clear linear decreases in Mg/Ca or Mg/Sr in G. menardii and Pulleniatina obliquiloculata with increasing (1) bottom water [CO3]2- undersaturation, (2) percent calcite dissolved in sediments calculated with biogeochemical modeling, (3) MFI, and (4) percent calcite dissolved derived from MFI. These findings lend further support to MFI as a calcite dissolution proxy for deep-sea sediments. In contrast, we find no significant correlation between Sr/Ca and independent dissolution indicators. Our results suggest that Mg/Ca and Mg/Sr from deep dwelling foraminifers could potentially be used as calcite dissolution proxies in combination with independent water temperature estimates. Likewise, establishing the relationship between MFI and dissolution-induced changes in the Mg/Ca of surface-dwelling foraminifers could provide a tool to correct Mg/Ca–derived sea surface temperature reconstructions for calcite dissolution. |
| title | (Tables 2, 3) Element ratios of planktonic foraminifera from western Pacific surface sediments |
| topic | DEPTH, sediment/rock; Elevation of event; ERDC; ERDC-089P; ERDC-090G; ERDC-098G; ERDC-109G; ERDC-110G; ERDC-111G; ERDC-114G; ERDC-115G; ERDC-116G; ERDC-118G; ERDC-121G; ERDC-126G; ERDC-127P; ERDC-130P; ERDC-132P; Event label; GC; Globorotalia menardii; Globorotalia menardii, Magnesium/Calcium ratio; Globorotalia tumida; Globorotalia tumida, Magnesium/Calcium ratio; Gravity corer; Latitude of event; Longitude of event; Magnesium/Calcium ratio, standard deviation; Magnesium/Strontium ratio; Magnesium/Strontium ratio, standard deviation; Neogloboquadrina dutertrei; Neogloboquadrina dutertrei, Magnesium/Calcium ratio; PC; Piston corer; Pulleniatina obliquiloculata; Pulleniatina obliquiloculata, Magnesium/Calcium ratio; Strontium/Calcium ratio; Thomas Washington |
| url | https://doi.org/10.1594/PANGAEA.832902 |