OSMIUM ISOTOPIC COMPOSITION OF CORALS: EVIDENCES FOR MULTIPLE SOURCES - SEAWATER OR DIAGENESIS RECORD?

dc.contributor.author	Levasseur S.
dc.contributor.author	Birck J.L.
dc.contributor.author	Allegre C.J.
dc.date.accessioned	2021-01-17T00:09:19Z
dc.date.available	2021-01-17T00:09:19Z
dc.date.issued	1999
dc.identifier	https://elibrary.ru/item.asp?id=157021
dc.identifier.citation	Geochimica et Cosmochimica Acta, 1999, 63, 9, 1335-1343
dc.identifier.issn	0016-7037
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/23263
dc.description.abstract	Osmium concentrations in corals are very low (<20 ppt) and large isotopic variations (between 2.92 +- 0.05 9.01 0.05) areobserved indicating sample heterogeneity. these interpreted as a two component mixing for each sample. the unradiogenic has about same value all samples is of mantle meteorite composition concentration. radiogenic composite signal, different resulting fromseawater osmium continental detrital sediment osmium. simple calculations show that micrometeoritic flux 40 20.106 kg/yr is too small by about two orders of magnitude to explain the composition of these samples. In the absence of a potential mantle source for the corals, it is considered that corals, as they filter water for feeding, scavenge meteoritical osmium from seawater.
dc.title	OSMIUM ISOTOPIC COMPOSITION OF CORALS: EVIDENCES FOR MULTIPLE SOURCES - SEAWATER OR DIAGENESIS RECORD?
dc.type	Статья

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