Early Precambrian basic rocks of the USA

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Authors:Snyder, G. L.; Hall, R. P.; Hughes, D. J.; Ludwig, K. R.
Author Affiliations:Primary:
U. S. Geol. Surv., Denver, CO, United States
Portsmouth Polytech., United Kingdom
Volume Title:Early Precambrian basic magmatism
Volume Authors:Hall, R. P., editor
Source:Early Precambrian basic magmatism, edited by R. P. Hall and D. J. Hughes, p.191-220. Publisher: Chapman and Hall, New York, NY, United States
Publication Date:1990
Note:In English; illus. incl. 20 analys., 2 tables, geol. sketch maps
Summary:Archaean complexes outcrop in two major provinces in the USA, one forming the SW tip of the Superior province in N Minnesota and Wisconsin, and the other comprising the Wyoming craton, outcropping in the mountain ranges of Wyoming and neighbouring states. Both provinces have significant plutonic, hypabyssal and volcanic basic components, ranging from early to late Archaean. In addition, early to mid-Proterozoic hypabyssal basic intrusions occur in virtually all of the Archaean cratonic regions, while early to mid-Proterozoic metavolcanic suites occur throughout western central USA. The authors catalogue and review the most important basic units and highlight their lithological and geochemical characteristics. The aim is to draw attention to the petrological differences and similarities between the various units, and to summarize some of the tectonic interpretations which can be drawn from them. [J.M.H.]
Subjects:Crystalline rocks; Dikes; IGCP; Igneous rocks; Intrusions; Mafic composition; Metamorphic rocks; Metavolcanic rocks; Petrology; Precambrian; United States; Igneous activity
Abstract Numbers:91M/2098
Record ID:1991002612
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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