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| Titel: |
Insights into the Formation of San Clemente Basin, off Baja California, Mexico: Lithological Observations and Geochemistry of Marine Minerals |
| Auteur: |
Aguirre-Bielschowsky, I. Ledesma-Vazquez, J. Daessle, L. W. Rendon-marquez, G. |
| Verschenen in: |
Marine georesources & geotechnology |
| Paginering: | Jaargang 25 (2007) nr. 2 pagina's 119-128 |
| Jaar: |
2007-04 |
| Inhoud: |
San Clemente Basin is part of the California Continental Borderland. Low temperature hydrothermal alteration is suggested for some minerals. Fe-Mn crusts are hydrogenetic (Fe/Mn = 0.83-1.14), with positive Ce anomaly, but no positive Eu anomaly that would suggest hydrothermal influence. Co is depleted (Co = 0.16-0.23%), probably due to dilution by a terrigenous component. The phosphorite is of high grade (P2O5 = 29%), with high Fe and Ca concentrations compared with other phosphorites from the Baja California Peninsula. It has a typical seawater-type REE pattern, and a significant negative Ce anomaly, which is indicative of outer shelf conditions for the San Clemente Basin during the Miocene. No lithologic evidence is found to suggest ophiolite-type rocks, as occurs in the nearby Santa Cruz and San Nicolas Basins. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 61 van 113 gevonden artikelen
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