Mantle Xenoliths from Southeastern New England
- F.R. Boyd and
- Henry O.A. Meyer
Published Online: 19 MAR 2013
Copyright © 1979 by the American Geophysical Union.
The Mantle Sample: Inclusion in Kimberlites and Other Volcanics
How to Cite
Leavy, B. D. and Hermes, O. D. (1979) Mantle Xenoliths from Southeastern New England, in The Mantle Sample: Inclusion in Kimberlites and Other Volcanics (eds F.R. Boyd and H. O.A. Meyer), American Geophysical Union, Washington, D.C.. doi: 10.1029/SP016p0374
- Published Online: 19 MAR 2013
- Published Print: 1 JAN 1979
Print ISBN: 9780875902135
Online ISBN: 9781118664858
- Crustal xenoliths and xenocrysts;
- Host dikes;
- Mineral chemistry;
- Ultramafic xenoliths;
- Whole-rock chemistry
Newly exposed mafic dikes that intrude granites in southwestern Rhode Island (USA) contain a suite of ultramafic xenoliths and megacrysts. This is the first reported occurrence of nodule-bearing rocks from southeastern New England. Ultramafic xenoliths in these dikes include spinel lherzolite, spinel harzburgite, and wehrlite. These have been mechanically transported upward in a lamprophyric matrix which crystallized relatively rapidly.
The mineral assemblages, textures, major element abundances, and mineral chemistry exhibited by these nodules indicate that they were derived from the upper mantle. Coincidence of the orientation of the Westerly dikes with Mesozoic lamprophyres in central New England suggests that the genesis of the host dikes and the mobilization of the included xenoliths was related to a major tectonic event which affected this part of New England during the post-Paleozoic.