A metamorphosed differentiated sill in northern Michigan

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ID: 308769
1959
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Abstract
An exceptionally thick differentiated metagabbro sill of middle Precambrian age has been found near Mansfield Location, Iron County, Michigan. This sill, known as the West Kiernan sill, intruded the sedimentary and volcanic rocks of the middle Precambrian Hemlock formation in late middle Precambrian time. The sill, differentiated after emplacement, was subsequently folded, and altered by low-grade regional metamorphism. Differentiation resulted from mineral fractionation and gravity sorting during crystallization. Igneous textures and structures throughout the sill indicate tectonic quiescence during the time of crystallization. Rhythmic layering in part of the sill indicates that convection currents were probably active locally during crystallization. The rocks of the sill have been divided into 5 zones, each representing petrographically and chemically distinct types. These zones are, from bottom to top, ultramafic, normal metagabbroic, transitional, granophyric, and metadiabasic (chilled). Although the mineral composition of the sill was greatly changed during regional metamorphism, its chemical make-up is believed to chiefly reflect variations imposed during differentiation.
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openalex_W2085457756 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Richard W. Bayley
Journal american journal of science
Year 1959
DOI
10.2475/ajs.257.6.408
URL
https://doi.org/10.2475/ajs.257.6.408
Keywords Keywords not found

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