Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin

Giuliani, Gaston; Fallick, Anthony E.; Rakotondrazafy, Michel; Ohnenstetter, Daniel; Andriamamonjy, Alfred; Ralantoarison, T.; Rakotosamizanany, Saholy; Razanatseheno, Marie Olga Madison; Offant, Yohann; Garnier, V.; Dunaigre, Christian; Schwarz, Dietmar; Mercier, Alain; Ratrimo, Voahangy; Ralison, Bruno

doi:10.1007/s00126-006-0105-3

Cited by 49 publications

(32 citation statements)

References 48 publications

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“…18 O values (e.g., Giuliani et al 2005Giuliani et al , 2007Yui et al 2006;Sutherland et al 2009a, b), the mineral inclusion suite (e.g., Guo et al 1996), their trace element geochemistry (Sutherland et al 2009b(Sutherland et al , 2017, and most notably on the Ga/Mg ratio (Peucat et al 2007). …”

Section: Introductionmentioning

confidence: 99%

Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany

Baldwin

Tomaschek

Ballhaus

et al. 2017

Contrib Mineral Petrol

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Section: Introductionmentioning

confidence: 99%

Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany

Baldwin

Tomaschek

Ballhaus

et al. 2017

Contrib Mineral Petrol

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“…The association amphibole + garnet + plagioclase (+ kyanite identified as an accessory mineral) in the host rock indicates that the corundum formed in a metamorphic environment. Rubies from other localities reveal, in general, quite different Giuliani et al (2005Giuliani et al ( , 2007 inclusion mineral associations (e.g., Henn et al, 1990;Hughes, 1997;Mercier et al, 1999;Simonet, 2000;Schwarz, 2001;and GGL database). Marble-hosted rubies from Myanmar's Mogok stone tract, for example, contain mostly rutile (needles and/or irregularly rounded opaque crystals of varying size), carbonates, sphene, zircon, apatite, garnet, graphite, spinel, sphalerite, pyrite, pyrrhotite, mica, olivine, pargasite, and anhydrite (the association "rutile + sphene + zircon" is probably locality-specific for rubies from Mogok).…”

Section: Microscopic Characteristics Growth Features Andmentioning

confidence: 99%

“…O of 4.7 ± 0.15‰. For information about the use of oxygen isotopes to characterize corundum from different deposits, see Giuliani et al (2007).…”

Section: A Prominent Peak At ~3160 CMmentioning

confidence: 99%

Rubies and Sapphires from Winza, Central Tanzania

Schwarz¹,

Pardieu²,

Saul³

et al. 2008

Gems & Gemology

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“…Sutherland et al, 1998;Shaw and Arima, 1998;Santosh and Collins, 2003;Simonet et al, 2004) but contrary to diamonds, they are mainly found at cratonic margins or within the neighbouring Proterozoic mobile belts (Le Giuliani et al, 2007;Le Goff et al, 2010).…”

Section: Gemstonesmentioning

confidence: 99%

Plume-induced dynamic instabilities near cratonic blocks: Implications for P–T–t paths and metallogeny

Guillou-Frottier

Burov

Cloetingh

et al. 2012

Global and Planetary Change

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et al.. Plume-induced dynamic instabilities near cratonic blocks: implications for P-Tt paths and metallogeny. Global and Planetary Change, Elsevier, 2012, 90-91, pp.37-50. 10.1016/j.gloplacha.2011 ÔØ Å ÒÙ× Ö ÔØ Plume-induced dynamic instabilities near cratonic blocks: Implications for P-T-t paths and metallogeny This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT2 AbstractPlume head -lithosphere interactions around cratonic blocks result in thermo-mechanical disturbances that lead to heating and burial phases of crustal rocks. We present results from numerical models of plume head -cratonic blocks interactions where a free upper surface condition and realistic rheologies are accounted for. These models include distinct cratonic blocks embedded within a continental lithosphere and separated by several hundreds of kilometres. Surface topography, thermal field and effective viscosity values are tracked for 20Myr of interactions. The modelled dynamic interaction of a plume head around cratonic blocks results in two main types of instabilities, each of them resulting in a distinct P-T-t path.The "slab-like" instability, focused on cratonic edges when plume head is away from the craton centre, shows a near-isothermal burial phase, while the "drip-like" instability occurring above plume head material results in a near-isobaric heating phase. Consequently, both clockwise and counterclockwise P-T-t paths can be expected around cratons, as actually observed around the Tanzanian craton and other cratonic areas. Metallogenic data from gemstone-bearing rocks in south-east Africa and data from ultrahigh temperature and ultrahigh pressure metamorphism are compatible with our model. It appears that vertical mantle dynamics around cratons may also explain thermobarometric signatures that are often attributed to horizontal tectonics.

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Oxygen isotope systematics of gem corundum deposits in Madagascar: relevance for their geological origin

Cited by 49 publications

References 48 publications

Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany

Petrogenesis of alkaline basalt-hosted sapphire megacrysts. Petrological and geochemical investigations of in situ sapphire occurrences from the Siebengebirge Volcanic Field, Germany

Rubies and Sapphires from Winza, Central Tanzania

Plume-induced dynamic instabilities near cratonic blocks: Implications for P–T–t paths and metallogeny

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