Evidence of fluid inclusions in metamorphic microdiamonds from the Kokchetav massif, northern Kazakhstan

被引:117
作者
De Corte, K
Cartigny, P
Shatsky, VS
Sobolev, NV
Javoy, M
机构
[1] Univ Ghent, Dept Geol & Soil Sci, B-9000 Ghent, Belgium
[2] Royal Museum Cent Africa, Dept Geol & Mineral, B-3080 Tervuren, Belgium
[3] Univ Paris 07, Lab Geochim Isotopes Stables, F-75251 Paris 05, France
[4] Inst Phys Globe, F-75251 Paris 05, France
[5] Inst Mineral & Petrog, Novosibirsk 630090, Russia
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1016/S0016-7037(98)00266-X
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Microdiamonds from garnet clinopyroxenites of the Kokchetav massif (northern Kazakhstan) and associated alluvial diamonds have been investigated using infrared spectroscopy. All diamonds have high nitrogen contents (from 747 up to 4488 +/- 20% at, ppm) and are of type Ib-IaA. Nitrogen data are consistent with a diamond formation over a narrow temperature range, Microdiamonds from garnet clinopyroxenites are characterized by water and carbonate inclusions, similar to those ocurring in fibrous coated diamonds from kimberlite, which suggest that diamonds grew from a C-H-O fluid. In contrast, alluvial microdiamonds do not contain any carbonate inclusions and H2O is absent or present in only minor amounts. Alluvial diamonds are considerably more N-rich but have a similar range of nitrogen aggregation states. It is suggested that alluvial diamonds belong to a separate diamond population compared with the microdiamonds from garnet clinopyroxenites. The Kokchetav microdiamonds an distinct from kimberlitic fibrous diamonds in that they contain abundant Ib centres, have high nitrogen contents and show different populations depending on host rock type. These characteristics support a metamorphic origin for the microdiamonds from the UHPM rocks of the Kokchetav massif. Copyright (C) 1998 Elsevier Science Ltd.
引用
收藏
页码:3765 / 3773
页数:9
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