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|Three well-known laccolith complexes of southeastern Utah, the Henry, La
Sal, and Abajo Mountains, have similar petrogenesis, tectonic control, and
lithophile hydrothermal mineralization. These complexes were the principle
subjects of a U.S. Geological Survey sponsored workshop on July 6 and 7,
1992, in Denver, Colo., convened by Jules D. Friedman and A. Curtis Huffman,
Jr. The purpose of the workshop was to present and clarify new field and
laboratory data in order to (1) provide an analog for Cordilleran laccolith
fields on intracratonic blocks; (2) narrow the age range of Colorado Plateau
laccoliths by consideration of errors in earlier dating attempts in relation
to recent high-precision 40Ar/ 39Ar and fission-track
dates; (3) relate distribution of southeastern Utah intrusive centers to
tectonics and structures; (4) associate emplacement of laccolith complexes
on the Colorado Plateau with specific tectonomagmatic events and possible
thermal events of the mantle; and (5) define possible economic ore- deposit
implications. This report summarizes much of the material presented at the
workshop and provides an extensive list of selected references pertaining
to geochronology and tectonics of the Colorado Plateau to facilitate further
U.S. Department of the Interior
U.S. Geological Survey
This page is <URL: http://pubs.usgs.gov/bul/b2158/b2158.html>
Maintainers: Joan Nadeau
information about this report contact: Jules
17 Aug 1998