933 resultados para Peter W. Williams
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Other editors: Osbourne McConathy, Will Earhart, Hollis Dann.
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Bibliography: p. 71.
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Cover title.
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"March 1992"
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Microfilm. Ann Arbor, Mich., University Microfilms (n.d.) (American culture series, Reel 247.6)
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Mode of access: Internet.
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Printed wrappers dated 1826.
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"Description of the Bible class association in Mr. Aikins̓ congregation, Utica, conducted by laymen."--p. 6-8.
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Stereotyped by H.T.E. Phinney, Cooperstown.
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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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Title from caption.
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Thesis (Master's)--University of Washington, 2016-06
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We present high spatial resolution ion-microprobe rare earth element (REE) data for discrete growth phases of complex polyphase zircons from early Archaean Amitsoq gneisses, outer Godthabsfjord, SW Greenland. In Matsuda diagrams, the two major growth phases, >3.8 Ga cores and ca. 3.65 Ga rims, have steep positive slopes from La to Lu, prominent positive Ce anomalies and negative Eu anomalies that are consistent with growth in a melt. Exceptions to this are non-cathodolurnmescent zircon developed between the cores and rims, sometimes truncating zoning in the cores, and late Archaean prismatic tip overgrowths, both of which exhibit flatter light REE (LREE) patterns and have small or no Eu anomaly, which we interpret as the result of metamorphism and/or small-degree, isolated partial melting. Our data support previous interpretations that the ca. 3.65 Ga zircon phase was generated in a melt, with the >3.8 Ga phase representing either original protolith zircons in a large degree partial melt or inherited zircons in an introduced magma. Regardless which of these two interpretations is correct for these, and similar, rocks in the outer GodthAbsfjord, the 3.65 Ga event will have profoundly affected isotopic systems and obscured beyond recognition any earlier igneous features such as cross-cutting relationships, which may only be assigned a minimum 3.65 Ga age. (C) 2003 Elsevier Science B.V. All rights reserved.