 | | Journal (article/letter/editorial) | | American craton: mantle xenolith evidence from Somerset Island kimberlites S.S. Schmidberger ) , D. Francis...UniÕersity, 3450 UniÕersity Street, Montreal, Quebec, Canada H3A 2A7 Received 23 March 1998; received in revised...Abstract The recently discovered Nikos kimberlite on Somerset Island, in the Canadian Arctic, hosts an...for 54 Nikos xenoliths indicate a highly refractory underlying mantle with high olivine forsterite contents...continental terranes Žave. olivine Fo s 91.0.. The Nikos xenoliths yield pressures and temperatures of last |  | | Journal (article/letter/editorial) | | Canadian craton: Mantle xenolith evidence from Somerset Island kimberlites S. S. Schmidberger D. Francis ... McGill University, Montreal, Qu6bec, H3A 2A7, Canada The nature and origin of the mantle roots beneath...recently discovered Cretaceous Nikos kimberlite (Pell, 1993) on Somerset Island, in the Canadian Arctic, consists...bulk compositions and mineral data for fifty-four Nikos xenoliths indicate their highly refractory nature...olivine abundances (avg. 80 wt.%) and olivine forsterite contents (avg. Fo = 92.3). These compositions |  | | Journal (article/letter/editorial) | | University, 3450 University Street, Montreal, Quebec, Canada H3A 2A7 Abstract The Earth’s continents are cored...mantle. Low-temperature mantle xenoliths from kimberlite pipes indicate that the shallow parts of these...composition of Fig. 1. Radar mosaic map of northwestern Canada showing the locations of mantle xenolith localities...Jericho kimberlite pipe in the Slave Province, and the Nikos kimberlite pipe of Somerset Island. Symbols:...xenolith suites—black circles, Jericho pipe and Nikos pipes—white triangles. D. Francis / Lithos 71 |  | Malarkey, J., Pearson, D.G., Kjarsgaard, B.A., Davidson, J.P., Nowell, G.M., Ottley, C.J., Stammer, J. (2010) From source to crust: Tracing magmatic evolution in a kimberlite and a melilitite using microsample geochemistry. Earth and Planetary Science Letters, 299 (1) 80-90 doi:10.1016/j.epsl.2010.08.020 | Journal (article/letter/editorial) | | source to crust: Tracing magmatic evolution in a kimberlite and a melilitite using microsample geochemistry...3LE, United Kingdom Geological Survey of Canada, Ottawa, Canada K1A 0E8 Colorado School of Mines, Golden...2010 Editor: R.W. Carlson Keywords: perovskite kimberlite melilitite Sr isotopes megacrysts a b s t r...study of primary minerals within the Jos kimberlite, Canada, in order to observe how different phases...progressive crustal interaction in the evolving kimberlite. Identification of the least contaminated phases |  | | Book | | They reveal that, like other Archean cratons, this region is underlain by a very refractory, melt-depleted...reveals that these samples are ancient fragments of island arc basalts that were once at the Earth's surface...British Columbia, Vancouver, British Columbia, Canada V6T 1Z1 Received 12 March 1998; received in revised...is possible only through xenoliths erupted in kimberlite magmas and it is often unclear to what 0024-4937/99/$...coincidence of L with the depth at which deep seated kimberlite xenoliths are believed to originate. Gaherty |  | | Journal (article/letter/editorial) | | of a Mantle Orthopyroxenite from the Udachnaya Kimberlite Dmitriy I. Rezvukhin 1, * , Taisia A. Alifirova...orthopyroxenite from the Udachnaya-East kimberlite pipe, Daldyn kimberlite field, Siberian platform. Epigenetic...deep-seated mantle metasomatism, infiltration of a kimberlite-related melt and late post-emplacement hydrothermal...alterations. The reaction of orthopyroxene with the kimberlite-related melt has led to orthopyroxene dissolution...minerals; melt inclusions; xenolith; orthopyroxenite; kimberlite; multistage metasomatism; orthopyroxene dissolution; |  | | Book | | org/details/seventhinternati07inte SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE Cape Town, April 1998 EXTENDED ABSTRACTS...Organising Committee of the 7th International Kimberlite Conference takes no responsibility for authors’...omissions. SOUTH AFRICA SEVENTH INTERNATIONAL KIMBERLITE CONFERENCE SPONSORS The 7IKC Organising Committee...recently discovered kimberlites of the Siberian kimberlite province. 9 K - rich clinopyroxenes as mantle...Chromite Macrocrysts and their Inclusions, Guaniamo Kimberlite Field, Venezuela. Primary and related diamond |  | | Book | | Note especially the lack of mineralization in the region of the Dow Meadow Depression (Figure 2.11). A black-and-white...core of massive sulfide in pegmatoid from the same region as in (a). Cast of surrounding pegmatoidal minerals...anomalously low compared with mid-ocean ridge, ocean island and flood basalts (800–1,500; e.g., Wallace and...non-volatile incompatible elements such as K2O. Ocean Island ‘hot spot’ basalts generally overlap with MORB...total Fe concentration. In contrast, some ocean island basalts can contain up to 0.3 wt.% S without significant |  | | Book | | country in which to carry out fieldwork. A whole new region of the world to get to grips with, a new craton...Greenstone Belt in west Greenland and to examine, in a region of superb exposure, what is perhaps the most ancient...southern part of the Superior province in Canada. This region shows a west to east transition from a... Country Craton Age (Ga) Features Abitibi Canada Superior Pd Belingwe Zimbabwe Zimbabwe 2...mapping in greenstone belts such as Abitibi in Canada has demonstrated that “modernstyle” tectonic processes |
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