Significance of variations in abundance of zircon and statistical parameters of zircon populations in a granodiorite dike, Bradford, Rhode Island

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ID: 308954
1961
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Abstract
Morphological data and weight percentages for zircon populations at successively higher elevations within a gently dipping, granodiorite dike argue against apparent evidence for gravity settling of heavy minerals. Uniformity of reduced major axes, weight percentages for zircon populations in the main body of the dike, and field relationships are the basis for this conclusion. Variation of weight percentages, elongation of zircons, volume of zircons, and reduced major axes for zircon populations in the lower contact zone are attributed to the sorting influence of laminar flow accompanying magma intrusion. Sharply bounded primary flow layers involving zircon, biotite, and other heavy minerals; the presence of steeply dipping disconformable platy flow structures; and the absence of abnormal amounts of heavy minerals in some gentle depressions at the base of the dike argue against gravity settling. This is consistent with a magma of normal viscosity as indicated by the medium- to fine-grained character of the rock and by the absence of evidence for excessive amounts of fugitive constituents. The observations are consistent with early crystallization of zircon in felsic igneous rocks. The separation procedure followed was designed to obtain the closest possible approximation to a true zircon population from a rock sample.
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openalex_W2031858271 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Bradford A. Hall, F. Donald Eckelmann
Journal american journal of science
Year 1961
DOI
10.2475/ajs.259.8.622
URL
https://doi.org/10.2475/ajs.259.8.622
Keywords Keywords not found

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