Strontium isotopic composition of interstitial waters from DSDP sites 25-245 and 38-336
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PANGAEA
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
1978
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| _version_ | 1867168552674394112 |
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| author | Hawkesworth, Chris J Elderfield, Henry |
| author_facet | Hawkesworth, Chris J Elderfield, Henry |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Measurements of 87Sr/86Sr ratios of interstitial waters from leg 25, site 245 and leg 38, site 336 of the Deep Sea Drilling Project show that the enrichment of Sr[2+] with depth is caused both by the alteration of volcanic material and by the introduction of strontium derived from calcium carbonate. 87Sr/86 Sr ratios range from 0.70913 to 0.70794 at site 245 and from 0.70916 to 0.70694 at site 336. The low ratios compared with contemporaneous seawater reflect the release of Sr from a volcanic source having, according to material-balance calculations, a 87Sr/86 Sr ratio of about 0.7034 at site 336. At this site the source appears to be volcanic ash and not basaltic basement which acts as a sink for Sr[2+] during in situ low-temperature weathering. The volcanic contribution to the strontium enrichment in the basal interstitial waters varies from <10% at site 245 to >50% at site 336. The remaining Sr[2+] is derived from Sr-rich biogenic carbonate during diagenetic recrystallization to form Sr-poor calcite. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_710844 |
| institution | PANGAEA |
| language | en |
| publishDate | 1978 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Strontium isotopic composition of interstitial waters from DSDP sites 25-245 and 38-336 Hawkesworth, Chris J Elderfield, Henry 25-245_Site; 38-336; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//BASIN; Leg25; Leg38; North Atlantic/Norwegian Sea Measurements of 87Sr/86Sr ratios of interstitial waters from leg 25, site 245 and leg 38, site 336 of the Deep Sea Drilling Project show that the enrichment of Sr[2+] with depth is caused both by the alteration of volcanic material and by the introduction of strontium derived from calcium carbonate. 87Sr/86 Sr ratios range from 0.70913 to 0.70794 at site 245 and from 0.70916 to 0.70694 at site 336. The low ratios compared with contemporaneous seawater reflect the release of Sr from a volcanic source having, according to material-balance calculations, a 87Sr/86 Sr ratio of about 0.7034 at site 336. At this site the source appears to be volcanic ash and not basaltic basement which acts as a sink for Sr[2+] during in situ low-temperature weathering. The volcanic contribution to the strontium enrichment in the basal interstitial waters varies from <10% at site 245 to >50% at site 336. The remaining Sr[2+] is derived from Sr-rich biogenic carbonate during diagenetic recrystallization to form Sr-poor calcite. |
| title | Strontium isotopic composition of interstitial waters from DSDP sites 25-245 and 38-336 |
| topic | 25-245_Site; 38-336; COMPCORE; Composite Core; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean//BASIN; Leg25; Leg38; North Atlantic/Norwegian Sea |
| url | https://doi.org/10.1594/PANGAEA.710844 |