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Science 16 April 1976:
Vol. 192. no. 4236, pp. 253 - 256
DOI: 10.1126/science.192.4236.253
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Articles

Diamonds in an Upper Mantle Peridotite Nodule from Kimberlite in Southern Wyoming

M. E. MCCALLUM 1 and DAVID H. EGGLER 2

1 Department of Earth Resources, Colorado State University, Fort Collins 80523, and U.S. Geological Survey, Box 25046, Denver Federal Center, Denver, Colorado 80225
2 Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008

Diamonds in a serpentinized garnet peridotite nodule from a diatreme in southern Wyoming are the first known occurrence in an upper mantle peridotite xenolith from a kimberlite intrusion in North America as well as the second authenticated occurrence of diamonds from kimberlite pipes in North America. The nodule is believed to have come from a section of depleted (partially melted) lherzolite at a depth of 130 to 180 kilometers.

Submitted on January 28, 1976


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
THE PRESSURES AND TEMPERATURES OF FORMATION OF DIAMOND BASED ON THERMOBAROMETRY OF CHROMIAN DIOPSIDE INCLUSIONS.
P. Nimis (2002)
Can Mineral 40, 871-884
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Science. ISSN 0036-8075 (print), 1095-9203 (online)