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Types of pegmatites in the Archean at Grand Canyon, Arizona

Campbell, Ian (1937) Types of pegmatites in the Archean at Grand Canyon, Arizona. American Mineralogist, 22 (5). pp. 436-445. ISSN 0003-004X.

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Granite pegmatites are abundantly developed in the Archean terrane in the Grand Canyon district. They are associated with the youngest Archean granites and appear to be later than the regional deformation. Simple composition is the rule, and complex varieties except for traces of boron facies, are almost unknown. Three types are recognized: the most abundant is similar to the common quartz-microcline pegmatites and is definitely intrusive into a series of meta-sediments and metabasites. A second type has developed by replacement, "pegmatization," processes. A third and very unusual type owes its origin to a late stage development of microcline within a quartz vein or quartz dike. The second and third types are only recognizable as such when the processes to which they owe their origin have stopped somewhat short of complete development. It is possible that many of what are regarded as Type I pegmatites may really be of Type II or Type III.

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Additional Information:© 1937 Mineralogical Society of America.
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Balch Graduate School of the Geological Sciences223
Issue or Number:5
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ID Code:101702
Deposited By: Tony Diaz
Deposited On:04 Mar 2020 20:18
Last Modified:04 Mar 2020 20:18

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