2026-10-15T10:25:56Z https://oai.datacite.org/oai

doi:10.1594/pangaea.710844 2024-07-20T18:43:42Z PANGAEA PANGAEA.REPOSITORY

Strontium isotopic composition of interstitial waters from DSDP sites 25-245 and 38-336 Hawkesworth, Chris J Elderfield, Henry PANGAEA 1978 Issued: 1978 doi:10.1016/0012-821x(78)90165-6 Composite Core Drilling/drill rig Leg25 Leg38 Glomar Challenger Deep Sea Drilling Project (DSDP) 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. Supplement to: Hawkesworth, Chris J; Elderfield, Henry (1978): The strontium isotopic composition of interstitial waters from sites 245 and 336 of the Deep Sea Drilling Project. Earth and Planetary Science Letters, 40(3), 423-432 en Collection Supplementary Publication Series of Datasets application/zip Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode