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Lake Ellen Kimberlite Prospect, Lake Ellen, Iron Co., Michigan, USA
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Latitude: 46°10'29"N
Longitude: 88°10'36"W
 
 
An exposure of an 18-acre diatreme of tuffaceous kimberlite breccia, located along a logging road west of Lake Ellen. Discovered in 1971, this is the first- and best-known of more than 20 kimberlite bodies that have been discovered in northern Michigan. Most are concentrated in a belt extending from this locality to Hermansville to the southwest. None have proven to be economically viable sources of diamond, however, microscopic diamonds have been found.

The Lake Ellen kimberlite was intruded into the surrounding Proterozoic Hemlock Volcanics formation approximately 180 MYA. In addition to occasional eclogitic mantle xenoliths, Ordovician limestone xenoliths are common among the rubbly, greenish-gray kimberlite breccia. The nearest outcrops of this limestone are 40 miles east, indicating that the formations once extended west to Lake Ellen.

Mineral List

Augite
'Clinopyroxene Subgroup'
Corundum
Diamond
Diopside
Enstatite
Forsterite
'Garnet'
Ilmenite
Kyanite
'Olivine'
'Orthopyroxene Subgroup'
Phlogopite
Pyrope
Rutile
Sanidine
Spinel


17 entries listed. 13 valid minerals.

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References

Cannon, W., Murdrey, M. (1981) "The Potential for Diamond-Bearing Kimberlite in Northern Michigan and Wisconsin", U. S. Geological Survey Circular No. 842.

Chartier, T. (1985) "The Texture and Mineralogy of the Lake Ellen Kimberlite, Crystal Falls, Michigan, USA", Abstract from 31st Annual Meeting of the Institute of Lake Superior Geology.

Jarvis, W. (1993) "Michigan Kimberlites: An Update", Abstract at Prospectors and Developers Association of Canada 61st Annual Meeting, Paper M-10.

Chartier, T. (editor) (1993) "Diamond-Bearing Kimberlite and Related Geology in the Upper Peninsula of Michigan", Michigan Basin Geological Society.

Janse (Bram), A. J. A., Sheahan, P. A. (1995) "Catalogue of World Wide Diamond and Kimberlite Occurrences: A Selective and Annotative Approach", J. Geochemical Exploration, Vol. 53, pp. 73-111.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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