U thhe dating of phosphates apatite monazite and xenotime

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Craig, Binary mixing of enriched and undegassed (primitive? Farley, Rare gases in Samoan xenoliths, Earth Planet. Zircon and monazite from granitic sheets and dikes in the Monashee complex, Canadian Cordillera, were investigated to determine whether igneous crystallization occurred at 1·9 Ga or 50 Ma with 1·9 Ga inherited zircon and monazite.Four of the five samples are weakly deformed to undeformed, despite occurring in a gneiss dome at the structurally deepest exposed level of the orogen that elsewhere was strongly deformed and partly melted at 50 Ma.The remainder of the monazite is 50 Ma and all monazite in one sample is 50 Ma.Composition and zoning of 1·9 Ga zircon and monazite are uniform within samples, yet differ between samples, indicating growth from 1·9 Ga magmas that are unique to each sample.The dominant occurrence of phosphate minerals in crystalline rocks is as accessory phases, most notably apatite, monazite, and xenotime.

Craig, He, Sr, and Nd isotopic variations in lavas from the Juan Fernandez Islands, Contrib.

We are pleased to present this volume entitled Phosphates: Geochemical, Geobiological and Materials Importance.

Phosphate minerals are an integral component of geological and biological systems.

ISBN 0-939950-60-X; ISBN13 978-0-939950-60-7 Several years ago, John Rakovan and John Hughes (colleagues at Miami of Ohio), and later Matt Kohn (at South Carolina), separately proposed short courses on phosphate minerals to the Council of the Mineralogical Society of America (MSA). Thus this volume, Phosphates: Geochemical, Geobiological, and Materials Importance, was organized.

It was prepared in advance of a short course of the same title, sponsored by MSA and presented at Golden, Colorado, October 25-27.

While diverse, these fields are all linked structurally, crystal-chemically and geochemically.

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