Refractory trace elements in diamond inclusions; further clues to the origins of the ancient cratons

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doi: 10.1130/0091-7613(1997)025<1143:RTEIDI>2.3.CO;2
Authors:Hart, Rodger J.; Tredoux, Marian; de Wit, Maarten J.
Author Affiliations:Primary:
University of the Witwatersrand, Schonland Research Centre, Johannesburg, South Africa
Other:
University of Cape Town, Rondebosch, South Africa
Volume Title:Geology (Boulder)
Source:Geology (Boulder), 25(12), p.1143-1146. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613
Publication Date:1997
Note:In English. With GSA Data Repository Item 9764; illus., incl. 1 table
Summary:Diamond inclusions are thought to preserve the characteristics of rocks from beneath the Archean cratons. We have found that refractory trace element ratios in these inclusions are similar to those measured in both rocks of the present-day oceanic lithosphere and some Archean greenstone belts. These observations are consistent with a model in which Archean continental lithosphere evolved by tectonic stacking of oceanic crust and its underlying mantle during intraoceanic collisions. We conceive the continental lithosphere to consist of alternating layers of basalt and peridotite derived from subducted and obducted Archean oceanic lithosphere. This process provides a mechanism for the genesis of diamonds in the metamorphic equivalent of these Archean rocks.
Subjects:Archean; Continental crust; Cratons; Crust; Diamond; Geochemistry; Inclusions; Lithosphere; Mineral inclusions; Models; Native elements; Obduction; Plate tectonics; Precambrian; Subduction; Trace elements
Abstract Numbers:98M/2766
Record ID:1997072463
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
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