Skip to Main Content
Book Chapter

9: Regional Al2SiO5 triple-point metamorphic rocks of northern New Mexico: A field trip to honor the career contributions of Lincoln Hollister to petrology and tectonics

By
Christopher G. Daniel
Christopher G. Daniel
Department of Geology & Environmental Geosciences, Bucknell University, Lewisburg, Pennsylvania 17837, USA
Search for other works by this author on:
Christopher L. Andronicos
Christopher L. Andronicos
Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, Indiana 47907, USA
Search for other works by this author on:
Ruth F. Aronoff
Ruth F. Aronoff
Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, Indiana 47907, USA
Search for other works by this author on:
Published:
January 01, 2016

Abstract

Proterozoic Al2SiO5 “triple-point” metamorphic rocks of north-central New Mexico are examined to honor the career contributions of Lincoln Hollister to petrology and tectonics, and to promote discussion of outstanding problems in metamorphic petrology. Hollister’s career began with studies of compositional zoning in garnet and staurolite, and interpreting the occurrence of coexisting Al2SiO5 polymorphs in British Columbia. These studies emphasized the kinetic and bulk composition controls of metamorphism. Hollister’s interest in the Al2SiO5 polymorphs led to his graduate student, Professor Jeff Grambling’s pioneering work that proposed the equilibrium occurrence of coexisting kyanite, sillimanite, and andalusite in the Truchas Peaks, New Mexico. Subsequently, polymetamorphism and the disequilibrium coexistence of kyanite, sillimanite, and andalusite have been proposed as alternate explanations for the occurrence of the polymorphs across the region.

Field stops in the Picuris Mountains and Tusas Mountains will visit classic metamorphic rock localities, which are the subject of debate regarding the equilibrium/disequilibrium nature of the regional “triple-point” metamorphism. The trip will examine Al2SiO5-bearing mineral assemblages to demonstrate the regional distribution of the polymorphs. Stops in the Picuris Mountains will examine andalusite ± cordierite, andalusite ± chloritoid, and kyanite + sillimanite + andalusite–bearing rocks. Field stops in the Tusas Mountains will show kyanite and sillimanite ± garnet–bearing assemblages. Garnet + biotite ± staurolite–bearing rocks are common in both areas and will be examined. Results of garnet, monazite, and zircon geochronology and their bearing on the P-T-t-D paths for the region and the timing of orogenesis will be discussed.

You do not currently have access to this article.

Figures & Tables

Contents

GSA Field Guide

Unfolding the Geology of the West

Stephen M. Keller
Stephen M. Keller
Colorado Geological Survey Colorado School of Mines 1801 19th Street Golden, Colorado 80401, USA
Search for other works by this author on:
Matthew L. Morgan
Matthew L. Morgan
Colorado Geological Survey Colorado School of Mines 1801 19th Street Golden, Colorado 80401, USA
Search for other works by this author on:
Geological Society of America
Volume
44
ISBN print:
9780813756448
Publication date:
January 01, 2016

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal