975 resultados para 52-417D


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Major element composition ranges of closely associated basalt glass-whole rock pairs from individual small cooling units approach the total known range of basalt glass and whole rock compositions at IPOD sites 417 and 418. The whole rock samples fall into two groups: one is depleted in MgO and distinctly enriched in plagioclase but has lost some olivine and/or pyroxene relative to its corresponding glass; and the other is enriched in MgO and in phenocrysts of olivine and pyroxene as well as plagioclase compared to its corresponding glass. By analogy with observed phenocryst distributions in lava pillows, tubes, and dikes, and with some theoretical studies, we infer that bulk rock compositions are strongly affected by phenocryst redistribution due to gravity settling, flotation, and dynamic sorting after eruption, although specific models are not well constrained by the one-dimensional geometry of drill core. Compositional trends or groupings in whole rock data resulting from such late-stage processes should not be confused with more fundamental compositional effects produced in deep chambers or during partial melting.

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National Highway Traffic Safety Administration, Washington, D.C.

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T.-p. in German, French and English.

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National Highway Traffic Safety Administration, Office of Vehicle Safety Compliance, Washington, D.C.

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National Highway Traffic Safety Administration, National Center for Statistics and Analysis, Washington, D.C.

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Mode of access: Internet.

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For piano.

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"Obras consultadas": p. vii.

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Mode of access: Internet.