911 resultados para Pablo Stoll
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Incluye relación completa de obras de los autores.
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Tr. of : Paul et Virginie.
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"Como una ampliación del informe publicamos en un apéndice los capítulos XIII y XIV de los Comentarios á la Ordenanza de minas de Gamboa"--Advertencia.
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Bibliography: v.1, p. [x]-xvi.
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Mode of access: Internet.
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Translation of Paul et Virginie.
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Fil: Basile, Teresa. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.
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The Hf isotope composition of seawater does not match that expected from dissolution of bulk continental crust. This mismatch is generally considered to be due to retention of unradiogenic Hf in resistant zircons during incomplete weathering of continental crust. During periods of intense glacial weathering, zircons should break down more efficiently, resulting in the release of highly unradiogenic Hf to the oceans. We test this hypothesis by comparing Nd and Hf isotope time series obtained from NW Atlantic ferromanganese crusts. Both isotope systems show a decrease associated with the onset of northern hemisphere glaciation. The observed changes display distinct trajectories in epsilon Nd- epsilon Hf space, which differ from previously reported arrays of bulk terrestrial material and seawater. Such patterns are consistent with the release of highly unradiogenic Hf from very old zircons, facilitated by enhanced mechanical weathering.
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The cores described are taken during the USS San Pablo Cruise 3 from July to August 1949 by the Scripps Institute of Oceanography. A total of 49 cores were recovered and are available at Scripps Institute of Oceanography for sampling and study.