Galapagos hot spot-spreading center system. 2: 87Sr/86Sr and large ion lithophile element variations (85oW-101oW).


Por: Verma S.P., Schilling J.-G.

Publicada: 1 ene 1982
Resumen:
Thirty eight samples of basalts dredged from the Galapagos spreading center (GSC) between 85oW-101.5oW longitudes have been analyzed for K, Rb, Cs, Ba, and Sr contents as well as for 87Sr/86Sr ratios. Basalts between 85oW-89oW segment of the GSC range from 0.7025-0.7028 in 87Sr/86Sr and those between 95.5oW- 101.5oW range from 0.7026-0.7027. These basalts are characterized by LREE-depleted patterns. Basalts from 89oW-95.5oW segment having slightly LREE-depleted to LREE-enriched patterns ((La/Sm)E.F. between 0.8-2.4) range from 0.7027-0.7031 in 87Sr/86Sr. The longitudinal 87Sr/86Sr variation shows a maximum at approx 92oW, where the GSC in nearest to Darwin Island. The alkali and alkaline earth elements as well as several element ratios also show maxima in their longitudinal profiles, but these occur at about 91oW. -from Authors

Filiaciones:
Verma S.P.:
 Grad Scho of Oceanog, Univ of Rhode Island, Kingston, RI 02881, USA., United States

Schilling J.-G.:
 Grad Scho of Oceanog, Univ of Rhode Island, Kingston, RI 02881, USA., United States
ISSN: 01480227
Editorial
AMER GEOPHYSICAL UNION, 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA, Estados Unidos America
Tipo de documento: Article
Volumen: 87 Número: B13
Páginas: 1083-1085

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