Oxygen isotope composition of the Denchai sapphire, Thailand: a clue to its enigmatic origin

Yui, Tzen‐Fu; Zaw, Khin; Limtrakun, Phisit

doi:10.1016/s0024-4937(02)00268-2

Cited by 35 publications

(29 citation statements)

References 35 publications

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“…7) Eiler et al 1997;Baker et al 2000). Sapphire genesis in felsic melts by partial melting and/or metasomatism of mantle spinel lherzolite with an original 18 O isotope composition (5 to 6 ‰), has been proposed by several authors (Oakes et al 1996;Yui et al 2003;Pin et al 2006). …”

Section: Oxygen Isotopes Of Sapphirementioning

confidence: 98%

“…The 18 O value in gem corundum represents a useful tool for deciphering its geological origin (Yui et al 2003Giuliani et al 2005Giuliani et al , 2007Giuliani et al , 2009Garnier et al 2005;Zaw et al 2006;Sutherland et al 2009). As the mantle and crustal rocks show distinct oxygen isotope compositions, the 18 O value enables us to investigate the origin and source of corundum.…”

Section: Oxygen Isotopes Of Sapphirementioning

confidence: 99%

See 1 more Smart Citation

Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin

Uher¹,

Giuliani²,

Szakáll³

et al. 2012

Geologica Carpathica

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Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and originBlue, grey-pink and pink sapphires from the Cerová Highlands, Western Carpathians (southern Slovakia) have been studied using CL, LA-ICP-MS, EMPA, and oxygen isotope methods. The sapphire occurs as (1) clastic heavy mineral in the secondary sandy filling of a Pliocene alkali basaltic maar at Hajnáčka, and (2) crystals in a pyroxenebearing syenite/anorthoclasite xenolith of Pleistocene alkali basalt near Gortva. Critical evaluation of compositional diagrams (Fe, Ti, Cr, Ga, Mg contents, Fe/Ti, Cr/Ga, Ga/Mg ratios) suggests a magmatic origin for clastic blue sapphires with lower Cr and Mg, but higher Fe and Ti concentrations in comparison to the grey-pink and pink varietes, as well as similar compositional trends with blue sapphire from the Gortva magmatic xenolith. Moreover, blue sapphires show similar δ18O values: 5.1 ‰ in the Gortva xenolith, 3.8 and 5.85 ‰ in the Hajnáčka placer, closely comparable to mantle to lower crustal magmatic rocks. On the contrary, pink and grey-pink sapphires show higher Cr and Mg, but lower Fe and Ti contents and their composition points to a metamorphic (metasomatic) origin.

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Section: Oxygen Isotopes Of Sapphirementioning

confidence: 98%

Section: Oxygen Isotopes Of Sapphirementioning

confidence: 99%

Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin

Uher¹,

Giuliani²,

Szakáll³

et al. 2012

Geologica Carpathica

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“…Yui et al, 2003) and gem-bearing basaltic volcanism has already been suggested to derive from a mantle plume activity (Sutherland and Fanning, 2001). …”

Section: Accepted M Manuscriptmentioning

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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“…Genetic models paid more attentions to whether crustderived materials are involved in the process of corundum crystallization [12,13] . As noble gases isotopic systematics is of potential to distinguish between crust-and mantle-derived materials/fluid, the isotopic compositions of corundum are able to provide new insights into its genesis.…”

Section: Articles Geochemistrymentioning

confidence: 99%

“…Yui et al [13] summarized different genetic models into three categories: (1) corundum crystallized from mantle-derived magma; (2) the formation of corundum was a result of solid-state metamorphic recrystallization of aluminous rocks transported beneath continental lithosphere during the plate subduction; (3) corundum was a product of hyridization reactions between mantle-derived magma and mid/lower-crustal rocks/magma. The second genetic model is incompatible with common occurrences of primary or pseudosecondary fluid/melt inclusions in corundum megacrysts.…”

Section: The Genesis Of the Corundumsmentioning

confidence: 99%

Noble gases in corundum megacrysts from the basalts in Changle, Shandong Province, eastern China

Song

Chen

et al. 2007

CHINESE SCI BULL

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This study presents noble gaseous data of the corundum megacrysts from the Cenozoic basalts inChangle, Shandong Province, eastern China. It is known that no noble gaseous data of corundum megacryst have been documented before. The 3 He/ 4 He ratios (1.13-7.37 Ra) of the corundums from Changle vary from atmosphere to MORB values; the 20 Ne/ 22 Ne (9.67-10.75) and 21 Ne/ 22 Ne (0.0280-0.0372) data define two linear trends on Ne three-isotope diagram, respectively, along the MFL and the correlation line between atmosphere and MORB; the 38 Ar/ 36 Ar (0.177-0.194) ratios, the 40 Ar/ 36 Ar (280.9 -404.2) ratios and the 128-136 Xe/ 132 Xe ration with obvious 129 Xe excess are generally higher than atmospheric component, but the 40 Ar/ 36 Ar ratios are much closer to atomospheric ratio. The isotopic compositions of noble gases (particularly for He and Ar) of the corundums are similar to those of pyroxene, anorthoclase megacrysts, and mantle-derived xenoliths from this area, and those of mantle-derived xenoliths from several areas in eastern China. Therefore, the noble gases trapped in the corundums probably are from mantle source, representing a 'mixed fluid' produced by the interaction between the lithospheric mantle and fluids releasing from the convective plate. Both the noble gas isotopic compositions and the oxygen isotopic compositions of the solid corundums are not the characteristics of crustal source. These suggest that the corundums crystallized from mantle-derived magmas with minimal crustal contamination. corundum megacryst, noble gas, Changle, fluid, mantle source, genesis.Noble gases (He, Ne, Ar, Kr and Xe) are important isotopic tracers in the studies of deep Earth geology and ore deposits [1][2][3][4] . Their isotopic compositions can provide unique information on properties and evolution of mantle, and identification of mantle-derived materials/fluids [1][2][3][4] . Several studies have revealed the characteristics of noble gases in mantle-derived xenoliths and megacrysts from the Cenozoic basaltic rocks in eastern China [5][6][7][8][9][10][11] . Generally, the 3 He/ 4 He ratios of those samples are similar to MORB ratios or are between atmospheric ratio and MORB ratios. The 40 Ar/ 36 Ar ratios are between atmospheric ratio and MORB ratios but much closer to atmospheric ratio. The He-Ar isotopes suggest that the mantle beneath eastern China have MORB-like reservoirs, as well as enriched mantle reservoirs, indicating that the mantle ever underwent metasomatism. It is found that 3 He/ 4 He ratios of the mantle-derived peridotite xenoliths differ from those of the megacrysts [5] . Furthermore, the garnet, pyroxene and anorthoclase megacrysts have different 3 He/ 4 He ratios, implying that they possibly derived from different depths [5] .Corundum megacrysts occur less commonly than other megacrysts in eastern China, and the genesis of this type corundum (related to basalt) is still enigma.

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Oxygen isotope composition of the Denchai sapphire, Thailand: a clue to its enigmatic origin

Cited by 35 publications

References 35 publications

Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin

Sapphires related to alkali basalts from the Cerová Highlands, Western Carpathians (southern Slovakia): composition and origin

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

Noble gases in corundum megacrysts from the basalts in Changle, Shandong Province, eastern China

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