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The global age distribution of granitic pegmatites

Andrew McCauley and Dwight C. Bradley
The global age distribution of granitic pegmatites (in Pegmatitic phosphate; a tribute to Francois Fontan, Andre-Mathieu Fransolet, and Paul Keller, Pietro Vignola (prefacer), Frederic Hatert (prefacer), Encarnacion Roda-Robles (prefacer), William B. Simmons (prefacer) and Carl A. Francis (prefacer))
The Canadian Mineralogist (April 2014) 52 (2): 183-190


An updated global compilation of 377 new and previously published ages indicates that granitic pegmatites range in age from Mesoarchean to Neogene and have a semi-periodic age distribution. Undivided granitic pegmatites show twelve age maxima: 2913, 2687, 2501, 1853, 1379, 1174, 988, 525, 483, 391, 319, and 72 Ma. These peaks correspond broadly with various proxy records of supercontinent assembly, including the age distributions of granites, detrital zircon grains, and passive margins. Lithium-cesium-tantalum (LCT) pegmatites have a similar age distribution to the undivided granitic pegmatites, with maxima at 2638, 1800, 962, 529, 485, 371, 309, and 274 Ma. Lithium and Ta resources in LCT pegmatites are concentrated in the Archean and Phanerozoic. While there are some Li resources from the Proterozoic, the dominantly bimodal distribution of resources is particularly evident for Ta. This distribution is similar to that of orogenic gold deposits, and has been interpreted to reflect the preservation potential of the orogenic belts where these deposits are formed. Niobium-yttrium-fluorine (NYF) pegmatites show similar age distributions to LCT pegmatites, but with a strong maximum at ca. 1000 Ma.

ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 52
Serial Issue: 2
Title: The global age distribution of granitic pegmatites
Title: Pegmatitic phosphate; a tribute to Francois Fontan, Andre-Mathieu Fransolet, and Paul Keller
Author(s): McCauley, AndrewBradley, Dwight C.
Author(s): Vignola, Pietroprefacer
Author(s): Hatert, Fredericprefacer
Author(s): Roda-Robles, Encarnacionprefacer
Author(s): Simmons, William B.prefacer
Author(s): Francis, Carl A.prefacer
Affiliation: U. S. Geological Survey, Anchorage, AK, United States
Pages: 183-190
Published: 201404
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 56
Accession Number: 2014-069574
Categories: Igneous and metamorphic petrologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201437
Program Name: USGSOPNon-USGS publications with USGS authors
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