A Caltech Library Service

The Globe pegmatite, Rio Arriba County, New Mexico

Wright, Lauren A. (1948) The Globe pegmatite, Rio Arriba County, New Mexico. American Journal of Science, 246 (11). pp. 665-688. ISSN 0002-9599. doi:10.2475/ajs.246.11.665.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


The Globe pegmatite, in the Petaca district of northern New Mexico, is a steeply dipping, tadpole-shaped dike about 650 feet long. Exposures developed during extensive mining of mica shoots above the 100-foot level reveal a symmetrical internal structure outlined by four microcline-quartz zones, and by a quartz core that is exposed near one end of the dike. In general the grain size and the proportion of quartz in the pegmatite increase from the walls inward. Albite and associated green muscovite vein and corrode microcline, quartz, green fluorite, and beryl of the zones, and are concentrated in replacement units that are best developed between the walls of the dike and its innermost zones. Spheroidal aggregates of radially oriented cleavelandite tablets are abundant, and featherlike clusters of columbite and moμazite occur in many of them. Purple fluorite, spessartite, and sericite also are associated with the cleavelandite, but such minor late constituents as samarskite, sulfide minerals, bismutite, some purple fluorite, and lepidolite seemingly are unrelated to it. The following paragenesis is indicated by rather clear-cut megascopic relations: (1) early development of quartz, microcline, green fluorite, and beryl, (2) formation of albite, green muscovite, ,and associated accessory minerals, chiefly along fractures in the earlier minerals, and (3) continued deposition of fracture-filling quartz, in part associated with earlier accessory minerals and in part with distinctly later and rarer minerals.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 1948 American Journal of Science. R.H. Jahns, who proposed and showed a continuing interest in the present paper, collaborated in much of the field work, made numerous helpful suggestions and criticisms, and furnished illustrative material. The writer also is indebted to W. Porter Irwin, who assisted effectively in the field work. Mr. Alberto Trujillo of La Madera, foreman at the mine, was very cooperative throughout the investigations and supplied much helpful information concerning the history of mining operations and the positions of inaccessible workings. Dr. W. T. Schaller of the U. S. Geological Survey discussed several problems in the field, and also contributed data on some of the accessory minerals. Critical review of the manuscript by Ian Campbell and R. H. Jahns of the California Institute of Technology, and by L. R. Page of the U. S. Geological Survey is gratefully acknowledged.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences425
Issue or Number:11
Record Number:CaltechAUTHORS:20220204-182617300
Persistent URL:
Official Citation:The Globe pegmatite, Rio Arriba County, New Mexico. Lauren Albert Wright. American Journal of Science, Nov 1948, 246 (11) 665-688; DOI: 10.2475/ajs.246.11.665
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113267
Deposited By: Tony Diaz
Deposited On:04 Feb 2022 18:28
Last Modified:04 Feb 2022 18:28

Repository Staff Only: item control page