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Titolo:
PO-210 AND PB-210 DISEQUILIBRIUM IN THE HYDROTHERMAL VENT FLUIDS AND CHIMNEY DEPOSITS FROM JUAN-DE-FUCA RIDGE
Autore:
HUSSAIN N; CHURCH TM; LUTHER GW; MOORE WS;
Indirizzi:
UNIV DELAWARE,COLL MARINE STUDIES NEWARK DE 19716 UNIV DELAWARE,COLL MARINE STUDIES LEWES DE 19958 UNIV S CAROLINA,DEPT GEOL SCI COLUMBIA SC 29208
Titolo Testata:
Geophysical research letters
fascicolo: 23, volume: 22, anno: 1995,
pagine: 3175 - 3178
SICI:
0094-8276(1995)22:23<3175:PAPDIT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
EAST PACIFIC RISE; GROWTH-RATES; 21-DEGREES-N; SULFIDES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
N. Hussain et al., "PO-210 AND PB-210 DISEQUILIBRIUM IN THE HYDROTHERMAL VENT FLUIDS AND CHIMNEY DEPOSITS FROM JUAN-DE-FUCA RIDGE", Geophysical research letters, 22(23), 1995, pp. 3175-3178

Abstract

Significantly deficient Po-210/Pb-210 activity ratios (0.14+/-0.14) are measured in the hydrothermal vent fluids collected from Juan de Fuca Ridge. Chimney deposits generally showed <5 dpm of excess Po-210. However, one sample from the outermost layer of a sealed spire yielded >1200 dpm g(-1) of excess Po-210.If the observed Po-210-Pb-210 disequilibrium in vent fluids is a result of Po-210 removal by the precipitates, residence time of polonium with respect to its irreversible removal from hot fluids is estimated to be of the order of a few minutes. Alternatively, if the disequilibrium is a result of an insufficient growth of Po-210 from in-situ Pb-210 following heating, the residence timeof hot fluids within the hydrothermal system can be shown to be less than 30 days, which is considerably lower than previously reported values.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 19:56:26