scholarly journals Features of coated diamonds from the Snap Lake/King Lake kimberlite dyke system, Slave craton, Canada, as revealed by optical topography

2019 ◽  
Keyword(s):  
Slave Craton ◽  
Optical Topography ◽  
Coated Diamonds

Features of coated diamonds from the Snap Lake/King Lake kimberlite dyke, Slave craton, Canada, as revealed by optical topography

Lithos ◽  
2004 ◽  
Vol 77 (1-4) ◽  
pp. 83-97 ◽  
Author(s):  
A.P Yelisseyev ◽  
N.P. Pokhilenko ◽  
J.W. Steeds ◽  
D.A. Zedgenizov ◽  
V.P. Afanasiev
Keyword(s):  
Slave Craton ◽  
Optical Topography ◽  
Coated Diamonds

Microinclusions in monocrystalline octahedral diamonds and coated diamonds from Diavik, Slave Craton: Clues to diamond genesis

Lithos ◽  
2009 ◽  
Vol 112 ◽  
pp. 724-735 ◽  
Author(s):  
Débora P. Araújo ◽  
William L. Griffin ◽  
Suzanne Y. O'Reilly ◽  
Kevin J. Grant ◽  
Trevor Ireland ◽  
...  
Keyword(s):  
Slave Craton ◽  
Diamond Genesis ◽  
Coated Diamonds

THE TRANSITION FROM HADEAN CRUSTAL WORKING TO ARCHEAN CRATON GROWTH: THE EXAMPLE FROM THE SLAVE CRATON

2019 ◽  
Author(s):  
Richard Carlson ◽  
◽  
Jesse Reimink ◽  
Steven B. Shirey ◽  
D. Graham Pearson ◽  
...  
Keyword(s):  
Slave Craton

The usefulness of double density optical topography

2011 ◽  
Vol 71 ◽  
pp. e206
Author(s):  
Keiji Oguro ◽  
Hidenori Yokota ◽  
Ayano Izawa ◽  
Ippeita Dan ◽  
Eiju Watanabe
Keyword(s):  
Optical Topography

Observation on Effect of Optical Stimulation to Human Using Optical Topography

2005 ◽  
Vol 44 (8) ◽  
pp. 6304-6306
Author(s):  
Hiro-Fumi Yanai ◽  
Akiyoshi Yorimoto ◽  
Toshio Kubota ◽  
Kan-ichi Fujii ◽  
Fumio Kawaguchi ◽  
...  
Keyword(s):  
Optical Stimulation ◽  
Optical Topography

Detrital chromites reveal Slave craton’s missing komatiite

Geology ◽  
2021 ◽  
Author(s):  
Rasmus Haugaard ◽  
Pedro Waterton ◽  
Luke Ootes ◽  
D. Graham Pearson ◽  
Yan Luo ◽  
...  
Keyword(s):  
Narrow Range ◽  
Thermal Evolution ◽  
Group Element ◽  
Detrital Zircons ◽  
Isotopic Data ◽  
Crust Formation ◽  
Slave Craton ◽  
Provenance Studies ◽  
Juvenile Crust ◽  
Greenstone Belts

Komatiitic magmatism is a characteristic feature of Archean cratons, diagnostic of the addition of juvenile crust, and a clue to the thermal evolution of early Earth lithosphere. The Slave craton in northwest Canada contains >20 greenstone belts but no identified komatiite. The reason for this dearth of komatiite, when compared to other Archean cratons, remains enigmatic. The Central Slave Cover Group (ca. 2.85 Ga) includes fuchsitic quartzite with relict detrital chromite grains in heavy-mineral laminations. Major and platinum group element systematics indicate that the chromites were derived from Al-undepleted komatiitic dunites. The chromites have low 187Os/188Os ratios relative to chondrite with a narrow range of rhenium depletion ages at 3.19 ± 0.12 Ga. While these ages overlap a documented crust formation event, they identify an unrecognized addition of juvenile crust that is not preserved in the bedrock exposures or the zircon isotopic data. The documentation of komatiitic magmatism via detrital chromites indicates a region of thin lithospheric mantle at ca. 3.2 Ga, either within or at the edge of the protocratonic nucleus. This study demonstrates the applicability of detrital chromites in provenance studies, augmenting the record supplied by detrital zircons.

Sulfur isotopes in diamonds reveal differences in continent construction

Science ◽  
2019 ◽  
Vol 364 (6438) ◽  
pp. 383-385 ◽  
Author(s):  
Karen V. Smit ◽  
Steven B. Shirey ◽  
Erik H. Hauri ◽  
Richard A. Stern
Keyword(s):  
Sulfur Isotope ◽  
Sulfur Isotopes ◽  
West African ◽  
Diamond Growth ◽  
Mantle Lithosphere ◽  
Continental Lithosphere ◽  
Slave Craton ◽  
Tectonic Processes ◽  
Isotope Record ◽  
Diamond Inclusions

Neoproterozoic West African diamonds contain sulfide inclusions with mass-independently fractionated (MIF) sulfur isotopes that trace Archean surficial signatures into the mantle. Two episodes of subduction are recorded in these West African sulfide inclusions: thickening of the continental lithosphere through horizontal processes around 3 billion years ago and reworking and diamond growth around 650 million years ago. We find that the sulfur isotope record in worldwide diamond inclusions is consistent with changes in tectonic processes that formed the continental lithosphere in the Archean. Slave craton diamonds that formed 3.5 billion years ago do not contain any MIF sulfur. Younger diamonds from the Kaapvaal, Zimbabwe, and West African cratons do contain MIF sulfur, which suggests craton construction by advective thickening of mantle lithosphere through conventional subduction-style horizontal tectonics.

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