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A nickel deposit near Dracut, Massachusetts

William Henry Dennen
A nickel deposit near Dracut, Massachusetts
Economic Geology and the Bulletin of the Society of Economic Geologists (January 1943) 38 (1): 25-55


A small pyrrhotite-pentlandite-chalcopyrite deposit between Lawrence and Lowell, Massachusetts, occurs in a Paleozoic noritic stock in Cambrian quartzite. The norite varies somewhat in composition. The deposit has been worked at various times for gold, silver, iron, copper, and nickel. Spectrographic analysis of the pyrrotite shows a small content of nickel and cobalt. The ore minerals, formed subsequent to the crystallization of the silicates, are those characteristic of this type of deposit, but show several interesting mineragraphic features. Pyrrhotite consistently has oriented exsolution blades. Pentlandite has been incompletely replaced by violarite, which is seen as a gridwork within the pentlandite crystals. Both magnetite and ilmenite are present, the latter chiefly in the country rock. Magnetite shows several different habits and associations, which indicate that several periods and modes of formation were operative. Marcasite replacement of pyrrhotite was a supergene process. Mineralogic and mineragraphic data coupled with field evidence indicate that the ore was deposited in the period when magmatic action was nearly finished but strong hydrothermal action had not yet begun---forming the type of deposit termed by Bateman (1942) as late-magmatic residual liquid segregation and injection.

ISSN: 0361-0128
EISSN: 1554-0774
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 38
Serial Issue: 1
Title: A nickel deposit near Dracut, Massachusetts
Pages: 25-55
Published: 194301
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1949-004191
Categories: Areal geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. maps
N41°15'00" - N42°55'00", W73°30'00" - W69°55'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1949
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