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diamond

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Journal Article
Journal: Geology
Published: 04 August 2017
Geology (2017) 45 (10): 871-874.
...Yana Fedortchouk; Ingrid L. Chinn; Maya G. Kopylova Abstract Kimberlite magmas, the primary source of diamonds, have many features indicative of explosive eruptions and high volatile contents. The main approaches used to establish exsolution of fluid during magma ascent include theoretical modeling...
FIGURES
Journal Article
Journal: Lithosphere
Published: 27 July 2017
Lithosphere (2017) 10 (1): 156-169.
... diamond. Microdiamonds from the Luobusa peridotites have δ 13 C (PDB) values ranging from −28.7‰ to −16.9‰, and N contents from 151 to 589 atomic ppm. The δ 13 C and N content values for diamonds from the Luobusa chromitites are −29‰ to −15.5‰ and 152–428 atomic ppm, respectively. Microdiamonds from...
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Journal Article
Journal: Lithosphere
Published: 20 March 2017
Lithosphere (2017) 10 (1): 133-141.
... 30 microdiamonds from 3 sources: (1) chromitite ore in Luobusa, Tibet; (2) peridotite in Luobusa, Tibet; and (3) chromitite ore in Ray-Iz, polar Ural Mountains, Russia. They are translucent, yellow to greenish-yellow diamonds with a cubo-octahedral polycrystalline or single crystal with partial cubo...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2421(06)
... Natural mantle-derived diamond is mainly associated with peridotite, pyroxenite, eclogite, lamproite, and kimberlite rocks ( Sobolev, 1977 ; Dawson, 1980 ; Jaques et al., 1984; Mitchell, 1986 ; Harris, 1992 ). However, there is considerable mineralogical and geochemical...
Journal Article
Published: 01 December 2001
The Canadian Mineralogist (2001) 39 (6): 1733-1745.
...Felix V. Kaminsky; Galina K. Khachatryan Abstract Diamond crystals from Siberian, Arkhangelsk, South African, Canadian and South American deposits were analyzed for structurally bound nitrogen, hydrogen and “platelet” defects using infrared (IR) absorption spectroscopy. Wide variations in total...
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Journal Article
Published: 03 April 2000
Canadian Journal of Earth Sciences (2000) 37 (4): 517-533.
... 1971 ). Details on several lamprophyre and carbonatite rocks, ranging in age from 168–116 Ma, are available in Larsen and Moller ( 1968 ), Bridgwater ( 1970 ), Hansen ( 1980 ). In 1994 a series of diamond bearing ultramafic dykes were identified along the eastern side of Ungava Bay in the Abloviak...
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Journal Article
Published: 01 March 2000
European Journal of Mineralogy (2000) 12 (2): 495-498.
...Lutz NASDALA; Hans-Joachim MASSONNE Abstract The identity of diamond inclusions in quartz-muscovite gneisses occurring in the Saxonian Erzgebirge near the Saidenbach reservoir was proven by laser-Raman micro-spectroscopy. The identification was additionally backed-up by graphitization of diamond...
FIGURES
Journal Article
Published: 01 December 1999
Mineralogical Magazine (1999) 63 (6): 829-856.
...B. Harte; I. C. W. Fitzsimons; J. W. Harris; M. L. Otter Abstract Secondary ion mass spectrometry (SIMS) techniques have been used to study the variation of C isotope ratio and N abundance within selected diamonds in relation to their crystal growth zones. The growth zones are seen...
Journal Article
Published: 01 December 1999
Mineralogical Magazine (1999) 63 (6): 857-878.
...I. C. W. Fitzsimons; B. Harte; I. L. Chinn; J. J. Gurney; W. R. Taylor Abstract Diamonds from George Creek, Colorado, preserve complex intergrowth textures between two major growth generations: homogeneous diamond with yellow-buff cathodoluminescence (CL); and diamond with blue-green CL and local...
Journal Article
Journal: Geology
Published: 01 August 1999
Geology (1999) 27 (8): 747-750.
...Falko Langenhorst; George I. Shafranovsky; Victor L. Masaitis; Marjatta Koivisto Abstract We report here the first discovery of impact diamonds on the Fennoscandian shield, in the deeply eroded Lappajärvi impact structure, Finland. The tabular morphology and microstructural twin bands provide...
Journal Article
Published: 01 August 1999
Mineralogical Magazine (1999) 63 (4): 447-471.
...R. M. Davies; S. Y. O'Reilly; W. L. Griffin Abstract Diamonds from alluvial deposits near Wellington, New South Wales, have been characterized on the basis of morphological features, mineral inclusions, C isotope signatures, N content and aggregation state and internal structure. The diamonds...
Journal Article
Journal: Geology
Published: 01 November 1998
Geology (1998) 26 (11): 971-974.
...N. V. Sobolev; E. S. Yefimova; D. M. DeR. Channer; P. F. N. Anderson; K. M. Barron Abstract The geochemistry of mineral inclusions in diamond is an important source of information about the composition of the continental lithospheric mantle at depths exceeding 120–150 km. At these depths, two main...
Journal Article
Published: 01 June 1998
European Journal of Mineralogy (1998) 10 (3): 497-504.
Journal Article
Published: 01 June 1998
Mineralogical Magazine (1998) 62 (3): 409-419.
Journal Article
Published: 01 January 1998
Reviews in Mineralogy and Geochemistry (1998) 37 (1): 33-96.
Journal Article
Journal: Geology
Published: 01 November 1997
Geology (1997) 25 (11): 967-970.
...Christian Koeberl; Victor L. Masaitis; George I. Shafranovsky; Iain Gilmour; Falko Langenhorst; Marcus Schrauder Abstract Diamonds were found in impact melt rocks and breccias at the Popigai impact structure in Siberia. The diamonds preserve the crystallographic habit and twinning of graphites...
Journal Article
Journal: Geology
Published: 01 November 1997
Geology (1997) 25 (11): 1019-1022.
...R. M. Hough; I. Gilmour; C. T. Pillinger; F. Langenhorst; A. Montanari Abstract Diamonds, up to 30 µm in size, were found in the iridium-rich layer from the K-T boundary site at Arroyo El Mimbral and the spherule bed from Arroyo El Peñon, northeastern Mexico. Stepped heating experiments indicate...
Journal Article
Journal: GSA Bulletin
Published: 01 August 1997
GSA Bulletin (1997) 109 (8): 1000-1020.
Journal Article
Journal: Geology
Published: 01 August 1995
Geology (1995) 23 (8): 743-746.
...Bradley R. Hacker; Lothar Ratschbacher; Laura Webb; Dong Shuwen Abstract Metamorphic coesite and diamond in the Dabie Shan, eastern China, testify to subduction of continental crust to >100 km depth. Exhumation of these ultrahigh-pressure rocks through the crust encompassed two stages. (1) South...
Journal Article
Journal: Geology
Published: 01 July 1995
Geology (1995) 23 (7): 597-600.
... and characterization of the diamond grains by Raman and infrared spectroscopy indicate the presence of substitutional impurities of H and N. Primary fluid inclusions in garnet and quartz in the diamond-bearing rock demonstrate the evolution of metamorphic volatile fluids from reduced N 2 -CO 2 compositions during...