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He, Ne and Ar in peridotitic and eclogitic paragenesis diamonds from the Jwaneng kimberlite, Botswana -- Implications for mantle evolution and diamond formation ages

Honda, Masahiko ; Phillips, David ; Harris, Jeff W. ; Matsumoto, Takuya

Earth and Planetary Science Letters, Jan 3, 2011, Vol.301(1-2), p.43(9) [Tạp chí có phản biện]

ISSN: 0012-821X

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  • Nhan đề:
    He, Ne and Ar in peridotitic and eclogitic paragenesis diamonds from the Jwaneng kimberlite, Botswana -- Implications for mantle evolution and diamond formation ages
  • Tác giả: Honda, Masahiko ; Phillips, David ; Harris, Jeff W. ; Matsumoto, Takuya
  • Chủ đề: Lithosphere ; Kimberlite ; Mantle (Geology) ; Diamond Mining
  • Là 1 phần của: Earth and Planetary Science Letters, Jan 3, 2011, Vol.301(1-2), p.43(9)
  • Mô tả: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.epsl.2010.10.008 Byline: Masahiko Honda, David Phillips, Jeff W. Harris, Takuya Matsumoto Keywords: diamond; noble gas; mantle evolution; mantle lithosphere Abstract: We have undertaken helium, neon and argon step-heating, isotopic analyses of eleven polycrystalline diamonds of known peridotite/eclogite paragenesis from the Jwaneng kimberlite pipe, Botswana. In contrast to the findings of crustal noble gases in framesites from the same kimberlite pipe (. Unusual noble gas compositions in polycrystalline diamonds: preliminary results from the Jwaneng kimberlite, Botswana. Chem. Geol. 203, 347-358.), the Jwaneng polycrystalline diamonds appear to contain similar noble gas isotopic compositions (particularly Ne) to those representing a mantle source for MORBs. This implies that the Jwaneng polycrystalline diamonds may have formed in recent times, possibly close to the time of kimberlite emplacement at ~235Ma. In contrast, Jwaneng framesites could be as old as gem diamonds (mineral inclusion ages of ~2.9Ga). Furthermore, the data indicate that the sub-continental mantle lithosphere in the region has heterogeneous Ne isotopic compositions, or that these compositions changed over time from crustal Ne (as observed in the framesites) to MORB-like (as observed in the polycrystalline diamonds). Article History: Received 21 January 2010; Revised 5 October 2010; Accepted 5 October 2010 Article Note: (miscellaneous) Editor: R.W. Carlson
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0012-821X

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