(Table A1) CaCO3 contents and Sr/Ca ratios in ODP Leg 130, 138 and 154
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| Formato: | Dataset Open Access |
| Lenguaje: | en |
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PANGAEA
2000
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| _version_ | 1867168093001744384 |
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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 | Strontium/calcium (Sr/Ca) ratios in bulk and foraminiferal calcite have been used to constrain the history of Sr/Ca in the oceans and to evaluate calcite diagenetic alteration. However bulk Sr/Ca records also may be influenced by differences in Sr uptake and/or in the diagenetic susceptibility of different calcium carbonate sedimentary components. We present data on the sediment size fraction and calcium carbonate distribution in bulk samples, Sr/Ca in a range of sedimentary size components, and Sr/Ca in bulk sediments. Ocean Drilling Program samples from sites on Ontong Java Plateau and Ceara Rise (in the western equatorial Pacific and Atlantic, respectively) and from sites in the eastern equatorial Pacific were selected to represent progressive stages in the diagenetic pathway from the sea floor through a range of burial depths equivalent to sediment ages of ~5.6, ~9.4, and ~37.1 Ma. Samples were subdivided by size to produce a unique data set of size-specific Sr/Ca ratios. Fine fraction (<45 ?m) Sr/Ca ratios are higher than those of all corresponding coarse fractions, indicating that fine nannofossil-dominated calcite has a Sr partition coefficient 1.3–1.5 times greater than that of coarse foraminifera-dominated calcite. Thus, absolute values of bulk Sr/Ca in contemporaneous samples reflect, in part, the ratio of fine to coarse calcite sedimentary components. Sr/Ca values in fine and coarse components also behave differently in their response to pre-burial dissolution and to recrystallization at depth. Coarse size components are sensitive to bottom water carbonate ion undersaturation, and they lose original Sr/Ca differences among contemporary samples over not, vert, similar10 my. In contrast, fine components recrystallize faster in more deeply buried samples. Interpretation of the historical Sr/Ca record is complicated by post-depositional diagenetic artifacts, and thus our data do not provide clear evidence of specific temporal changes in oceanic Sr/Ca ratios over the past 10 million years. This paper represents the first systematic attempt to examine trends in calcite Sr/Ca as a function of sediment size fraction and age. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_745110 |
| institution | PANGAEA |
| language | en |
| publishDate | 2000 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table A1) CaCO3 contents and Sr/Ca ratios in ODP Leg 130, 138 and 154 Andreasen, Gretchen Hampt Delaney, Margaret Lois 130-803C; 130-803D; 130-804A; 130-804B; 130-804C; 130-806B; 130-806C; 130-807A; 130-807C; 138-844; 138-846A; 138-846B; 154-925A; 154-925B; 154-925E; 154-929A; 154-929B; 154-929E; AGE; Calcium carbonate; Calculated; COMPCORE; Composite Core; Coulometry; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; ICP-MS, Thermo Finnigan Mat, Element; Joides Resolution; Leg130; Leg138; Leg154; Mass; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Size fraction < 0.045 mm; Size fraction > 0.063 mm, sand; Size fraction > 0.425 mm; Size fraction 0.063-0.045 mm; Size fraction 0.125-0.063 mm; Size fraction 0.250-0.125 mm; Size fraction 0.355-0.250 mm; Size fraction 0.425-355 mm; South Pacific Ocean; Strontium/Calcium ratio; West equatorial Pacific Ocean Strontium/calcium (Sr/Ca) ratios in bulk and foraminiferal calcite have been used to constrain the history of Sr/Ca in the oceans and to evaluate calcite diagenetic alteration. However bulk Sr/Ca records also may be influenced by differences in Sr uptake and/or in the diagenetic susceptibility of different calcium carbonate sedimentary components. We present data on the sediment size fraction and calcium carbonate distribution in bulk samples, Sr/Ca in a range of sedimentary size components, and Sr/Ca in bulk sediments. Ocean Drilling Program samples from sites on Ontong Java Plateau and Ceara Rise (in the western equatorial Pacific and Atlantic, respectively) and from sites in the eastern equatorial Pacific were selected to represent progressive stages in the diagenetic pathway from the sea floor through a range of burial depths equivalent to sediment ages of ~5.6, ~9.4, and ~37.1 Ma. Samples were subdivided by size to produce a unique data set of size-specific Sr/Ca ratios. Fine fraction (<45 ?m) Sr/Ca ratios are higher than those of all corresponding coarse fractions, indicating that fine nannofossil-dominated calcite has a Sr partition coefficient 1.3–1.5 times greater than that of coarse foraminifera-dominated calcite. Thus, absolute values of bulk Sr/Ca in contemporaneous samples reflect, in part, the ratio of fine to coarse calcite sedimentary components. Sr/Ca values in fine and coarse components also behave differently in their response to pre-burial dissolution and to recrystallization at depth. Coarse size components are sensitive to bottom water carbonate ion undersaturation, and they lose original Sr/Ca differences among contemporary samples over not, vert, similar10 my. In contrast, fine components recrystallize faster in more deeply buried samples. Interpretation of the historical Sr/Ca record is complicated by post-depositional diagenetic artifacts, and thus our data do not provide clear evidence of specific temporal changes in oceanic Sr/Ca ratios over the past 10 million years. This paper represents the first systematic attempt to examine trends in calcite Sr/Ca as a function of sediment size fraction and age. |
| title | (Table A1) CaCO3 contents and Sr/Ca ratios in ODP Leg 130, 138 and 154 |
| topic | 130-803C; 130-803D; 130-804A; 130-804B; 130-804C; 130-806B; 130-806C; 130-807A; 130-807C; 138-844; 138-846A; 138-846B; 154-925A; 154-925B; 154-925E; 154-929A; 154-929B; 154-929E; AGE; Calcium carbonate; Calculated; COMPCORE; Composite Core; Coulometry; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; ICP-MS, Thermo Finnigan Mat, Element; Joides Resolution; Leg130; Leg138; Leg154; Mass; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; Sample code/label; Size fraction < 0.045 mm; Size fraction > 0.063 mm, sand; Size fraction > 0.425 mm; Size fraction 0.063-0.045 mm; Size fraction 0.125-0.063 mm; Size fraction 0.250-0.125 mm; Size fraction 0.355-0.250 mm; Size fraction 0.425-355 mm; South Pacific Ocean; Strontium/Calcium ratio; West equatorial Pacific Ocean |
| url | https://doi.org/10.1594/PANGAEA.745110 |