(Table 3) Relative depth and age, CaCO3, δ¹⁸O, δ¹³C and Sr/Ca analysis from ODP Leg 130, 154 and 138
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2000
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| _version_ | 1867169983456346112 |
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| author | Andreasen, Gretchen Hampt Delaney, Margaret Lois |
| author_facet | Andreasen, Gretchen Hampt Delaney, Margaret Lois |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Interpretations of calcite strontium/calcium records in terms of ocean history and calcite diagenesis require distinguishing the effects on deep-sea calcite sediments of changes in ocean chemistry, of different mixes of calcite-depositing organisms as sediment contributors through time and space, and of the loss of Sr during diagenetic calcite recrystallization. In this paper Sr/Ca and d18O values of bulk calcium carbonate sediments are used to estimate the relative extent of calcite recrystallization in samples from four time points (core tops, 5.6, 9.4, and 37.1 Ma) at eight Ocean Drilling Program sites in the equatorial Atlantic (Ceara Rise) and equatorial Pacific (Ontong Java Plateau and two eastern equatorial Pacific sites). The possibility that site-to-site differences in calcite Sr/Ca at a given time point originated from temporal variations in ocean chemistry was eliminated by careful age control of samples for each time point, with sample ages differing by less than the oceanic residence times of Sr and Ca. The Sr/Ca and d18O values of 5.6- and 9.4-Ma samples from the less-carbonate-rich eastern equatorial Pacific sites and Ceara Rise Site 929 appear to be less diagenetically altered than the Sr/Ca and d18O values of contemporaneous samples from the more carbonate-rich sites. It is evident from these data that both Sr/Ca and d18O in bulk calcite have been diagenetically altered in some samples 5.6 Ma and older. These data indicate that noncarbonate sedimentary components, like clay and biogenic silica, have partially suppressed recrystallization at the lower carbonate sites. Sr/Ca data from the less altered, carbonate-poor sites indicate higher oceanic Sr/Ca relative to today at 5.6 and 9.4 Ma. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_767461 |
| institution | PANGAEA |
| language | en |
| publishDate | 2000 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 3) Relative depth and age, CaCO3, δ¹⁸O, δ¹³C and Sr/Ca analysis from ODP Leg 130, 154 and 138 Andreasen, Gretchen Hampt Delaney, Margaret Lois 130-803D; 130-804A; 130-804B; 130-804C; 130-806B; 130-806C; 130-807A; 130-807C; 138-844B; 138-844C; 138-846A; 138-846B; 154-925A; 154-925B; 154-925E; 154-929A; 154-929B; 154-929E; AGE; Age, relative; Calcium carbonate; Datum level; Depth, relative; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Isotope ratio mass spectrometry; Joides Resolution; Leg130; Leg138; Leg154; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; South Pacific Ocean; Strontium/Calcium ratio; West equatorial Pacific Ocean; δ13C, carbonate; δ18O, carbonate Interpretations of calcite strontium/calcium records in terms of ocean history and calcite diagenesis require distinguishing the effects on deep-sea calcite sediments of changes in ocean chemistry, of different mixes of calcite-depositing organisms as sediment contributors through time and space, and of the loss of Sr during diagenetic calcite recrystallization. In this paper Sr/Ca and d18O values of bulk calcium carbonate sediments are used to estimate the relative extent of calcite recrystallization in samples from four time points (core tops, 5.6, 9.4, and 37.1 Ma) at eight Ocean Drilling Program sites in the equatorial Atlantic (Ceara Rise) and equatorial Pacific (Ontong Java Plateau and two eastern equatorial Pacific sites). The possibility that site-to-site differences in calcite Sr/Ca at a given time point originated from temporal variations in ocean chemistry was eliminated by careful age control of samples for each time point, with sample ages differing by less than the oceanic residence times of Sr and Ca. The Sr/Ca and d18O values of 5.6- and 9.4-Ma samples from the less-carbonate-rich eastern equatorial Pacific sites and Ceara Rise Site 929 appear to be less diagenetically altered than the Sr/Ca and d18O values of contemporaneous samples from the more carbonate-rich sites. It is evident from these data that both Sr/Ca and d18O in bulk calcite have been diagenetically altered in some samples 5.6 Ma and older. These data indicate that noncarbonate sedimentary components, like clay and biogenic silica, have partially suppressed recrystallization at the lower carbonate sites. Sr/Ca data from the less altered, carbonate-poor sites indicate higher oceanic Sr/Ca relative to today at 5.6 and 9.4 Ma. |
| title | (Table 3) Relative depth and age, CaCO3, δ¹⁸O, δ¹³C and Sr/Ca analysis from ODP Leg 130, 154 and 138 |
| topic | 130-803D; 130-804A; 130-804B; 130-804C; 130-806B; 130-806C; 130-807A; 130-807C; 138-844B; 138-844C; 138-846A; 138-846B; 154-925A; 154-925B; 154-925E; 154-929A; 154-929B; 154-929E; AGE; Age, relative; Calcium carbonate; Datum level; Depth, relative; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; Isotope ratio mass spectrometry; Joides Resolution; Leg130; Leg138; Leg154; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; South Pacific Ocean; Strontium/Calcium ratio; West equatorial Pacific Ocean; δ13C, carbonate; δ18O, carbonate |
| url | https://doi.org/10.1594/PANGAEA.767461 |