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Zone of Anomalous Mantle

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Proceedings of 10th International Kimberlite Conference

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Abstract

The most striking characteristic of the diamond fields of the Siberian and Slave cratons is the linear distribution of the most significantly diamondiferous kimberlites. The diamondiferous Darnley Bay and Dharma kimberlites and the source area of the Lena West diamonds and kimberlite indicator minerals may lie on a northern extension of the Slave lineament displaced 350 km to the west. Extensions of the Slave lineament to the south may include the Buffalo Hills/Birch Mountain kimberlites of Alberta and the Fort a la Corne kimberlites of Saskatchewan. With its displaced northern and southern extensions the lineament may be 2300 km long. The Siberian diamond fields have a linear distribution over 1000 km with one offset. This lineament has been described as a “Zone of Anomalous Mantle”. A model proposed for the Slave craton in which Paleoproterozoic lithosphere has underplated Mesoarchean lithosphere beneath the Slave lineament and controls the geometry of the lineament is applied to the adjoining northern and southern extensions of the Slave lineament and to the Siberian “Zone of Anomalous Mantle”. It is concluded that there may have been a single “Zone of Anomalous Mantle” formed on the Pacific Ocean side of an Archean craton (Siberia/N. America) in Paleoproterozoic time and the present location of the segments results from major lateral displacements. The Aekit Proterozoic orogenic belt separated, thinned and destroyed the base of the adjoining Siberian and N. American parts of the craton.

An erratum to this chapter can be found at http://dx.doi.org/10.1007/978-81-322-1173-0_20

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Acknowledgments

The authors would like to thank Ms. Megan Cook of the University of Houston for the kind help with research.

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Authors and Affiliations

  1. Talmora Diamond Inc, Toronto, Canada

    R. Davies & A. W. Davies

Authors
  1. R. Davies
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  2. A. W. Davies
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Correspondence to R. Davies .

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Editors and Affiliations

  1. Dept of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada

    D Graham Pearson

  2. Dept of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada

    Herman S Grütter

  3. School of Geographical & Earth Sciences, University of Glasgow, Glasgow, United Kingdom

    Jeff W Harris

  4. Geological Survey of Canada, Ottawa, Ontario, Canada

    Bruce A Kjarsgaard

  5. Finland Isotope Geosciences Laboratory, Geological Survey of Finland (GTK), Espoo, Finland

    Hugh O’Brien

  6. Department of Geology, Banaras Hindu University, Varanasi, Uttar Pradesh, India

    N V Chalapathi Rao

  7. School of Earth Sciences, Bristol University, Bristol, United Kingdom

    Steven Sparks

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© 2013 Geological Society of India

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Davies, R., Davies, A.W. (2013). Zone of Anomalous Mantle. In: Pearson, D., et al. Proceedings of 10th International Kimberlite Conference. Springer, New Delhi. https://doi.org/10.1007/978-81-322-1173-0_10

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