A40-K40 Dating of Igneous and Metamorphic Rocks in Western Montana
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Abstract:
$A^{40}-K^{40}$ dates, obtained by the use of the isotope dilution method, are reported for a number of occurrences of igneous and metamorphic rocks from western Montana.Keywords:
Isotope dilution
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Pegmatite
Felsic
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Introduction. 1. Review of the Microscope and Mineral Optics. 2. Rock-Forming Minerals and Their Optical Properties. 3. Classification of Igneous Rocks. 4. Texture and Structures of Igneous Rocks. 5. Classification and Textures of Metamorphic Rocks. Index.
Texture (cosmology)
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ABSTRACT Raman spectroscopy is used for the first time for distinguishing igneous zircons from metamorphic zircons. Igneous zircons, especially those from granitic rocks, commonly show a Raman peak at 1461 Δcm−1 with significant intensity, whereas metamorphic zircons do not show this peak or the peak is very weak. This may be related to the rare‐earth element (REE) contents in zircon. Thus, Raman spectroscopy provides a new, fast and non‐destructive means for investigating the structure and origin of zircons.
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