Oxygen isotope studies on placer sapphire and ruby in the Chanthaburi-Trat alkali basaltic gemfield, Thailand

Yui, Tzen‐Fu; Wu, Chao-Ming; Limtrakun, Phisit; Sricharn, Weerapan; Boonsoong, Apichet

doi:10.1016/j.lithos.2005.06.002

Cited by 36 publications

(23 citation statements)

References 34 publications

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“…Nigeria (Wright, 1970), Germany, (Tietz and Büchner, 2007), Australia, (Stephenson, 1976) and Thailand, Cambodia and Laos (Barr and Macdonald, 1979;Coenraads et al, 1995;Sutherland et al, 2002a). The southeast Asian sapphires have long been regarded as probable products from the mantle or lower crust MacDonald, 1979, 1981), a conclusion reaffirmed by Yui et al (2006), Graham et al (2008) and Giuliani et al (2009).…”

Section: Corundum-bearing Magmatic Assemblagesmentioning

confidence: 98%

Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small-melt fractions from the upper mantle

Upton¹,

Finch²,

Słaby³

2009

Mineral. mag.

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ABSTR ACTCa-poor and typically Na-rich feldspar megacrysts are common associates of spinel lherzolitic and pyroxenitic xenoliths in Scottish alkalic basalts. Associated megacrysts and composite megacrysts and salic xenoliths include apatite, magnetite, zircon, biotite, Fe-rich pyroxene(s) and corundum. The salic xenoliths and related megacrysts are referred to collectively as the 'anorthoclasite suite': the majority of the samples are inferred to derive from the disaggregation of coarse-grained, typically Na-rich, syenitic protoliths at depth. Rare occurrences of euhedral anorthoclase megacrysts, together with zircon dating, imply that the suite crystallized at, or very shortly before, their entrainment by the basaltic host magmas. Some evidence suggests that the anorthoclasite suite protoliths lie within ultramafic (pyroxenitic) domains in the deep crust. The latter are inferred to be pegmatites, crystallized from carbonated trachytic magmas with widely variable Ca, Na, K, Ba and trace-element contents, and to have ranged from metaluminous to peraluminous. Crystal zonation and resorption textures within the salic xenoliths imply that the crystallization of the parent magmas was complex. Confirmation of this comes from cathodoluminescence studies of the feldspars showing that early ('primary') anorthoclases and potassian albites exhibit partial replacement by a more potassic feldspar. A third generation of potassic feldspar (enriched in an assortment of trace elements and deduced to have crystallized from a carbonated high-K melt) forms transecting zoned veins in which carbonate fills the axial zone.Whereas most of the anorthoclasite suite materials are inferred to have grown from metaluminous magmas, the occurrence of magmatic corundum in salic xenoliths indicates crystallization from magmas that were peraluminous. The corundum-bearing samples also contain Nb-rich oxide minerals and their associated feldspars have the highest rare-earth element (REE) contents. Accordingly, the peraluminous trachyte magmas are deduced to have been specifically enriched in high field-strength trace elements. It is proposed that formation of the anorthoclasite suite protoliths is a phenomenon closely related to that of salic glass 'pockets', well known from spinel lherzolite xenoliths around the world. Not only are there compositional affinities, but both sets of phenomena appear to have closely pre-empted the ascent of alkali basalt (host) magmas. We propose that the two sets of phenomena are linked and that the anorthoclasite suite derived from coarse-grained sheets, generated by the aggregation of salic melt fractions rising from the shallow mantle and heralding the onset of basaltic magmatism.

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Section: Corundum-bearing Magmatic Assemblagesmentioning

confidence: 98%

Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small-melt fractions from the upper mantle

Upton¹,

Finch²,

Słaby³

2009

Mineral. mag.

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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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“…Marble-hosted corundum samples have high d 18 O, reported by Giuliani et al (2005) to range from +16.3‰ to +23‰ and by Yui et al (2008) from +21.6‰ to +25.7‰. Rubies and sapphires from basalts, igneous rocks, and non-carbonate metamorphic rocks have lower d 18 O, ranging from +1.3‰ to +13.9‰ (Yui et al 2003(Yui et al , 2006Giuliani et al 2005Giuliani et al , 2009Vysotsky et al 2009). Ruby and sapphire specimens from the same placer deposit have been shown to have distinct d 18 O values (Yui et al 2006), suggesting different source locations for the placer.…”

Section: Introductionmentioning

confidence: 99%

“…Rubies and sapphires from basalts, igneous rocks, and non-carbonate metamorphic rocks have lower d 18 O, ranging from +1.3‰ to +13.9‰ (Yui et al 2003(Yui et al , 2006Giuliani et al 2005Giuliani et al , 2009Vysotsky et al 2009). Ruby and sapphire specimens from the same placer deposit have been shown to have distinct d 18 O values (Yui et al 2006), suggesting different source locations for the placer. Overall, oxygen isotope analysis of corundum has been able to set some constraints on the source lithology of rubies and sapphires, despite significant overlap in isotopic composition of samples from various igneous and non-carbonate metamorphic lithologies (Giuliani et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Provenance determination of sapphires and rubies using laser-induced breakdown spectroscopy and multivariate analysis

Kochelek

McMillan

McManus³

et al. 2015

American Mineralogist

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Determination of gem provenance is a topic of research in the gemological community for financial, security, and societal reasons. Laser-induced breakdown spectroscopy (LIBS) and multivariate analysis have the potential to revolutionize the field of gem provenance. This study acquired LIBS spectra from 569 rough sapphire and ruby specimens from 21 localities in 11 countries. The spectra were analyzed using the multivariate technique partial least-squares regression (PLSR) in separate algorithms for sapphires and rubies. Each algorithm consists of a series of PLS models. Each model compares the spectra from a locality of interest to the spectra from all other localities in the database. Success rates, as determined by the percent of correct provenance identifications, are 98.9% (sapphire) and 96.0% (ruby) for country of origin and 97.9% (sapphire) and 95.4% (ruby) for deposit of origin. Individual deposits are not recognized by the concentrations of a few elements; rather, the unique compositional signature of each deposit consists of the ratios of many elements, primarily Ca, Zr, Fe, Ba, Mt, Ti, Sr, Si, Cr, H, C, and Li, some of which may reside in inclusions. This work demonstrates that determination of country or deposit of origin may be related to a quantitative measure with a high level of success.

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Oxygen isotope studies on placer sapphire and ruby in the Chanthaburi-Trat alkali basaltic gemfield, Thailand

Cited by 36 publications

References 34 publications

Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small-melt fractions from the upper mantle

Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small-melt fractions from the upper mantle

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

Provenance determination of sapphires and rubies using laser-induced breakdown spectroscopy and multivariate analysis

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