A new jadeitite jade locality (Sierra del Convento, Cuba): first report and some petrological and archeological implications

García-Casco, Antonio; Vega, Antonio Rodríguez; Cárdenas-Párraga, Juan; Iturralde‐Vinent, Manuel A.; Lázaro, Concepción; Blanco-Quintero, Idael Francisco; Rojas‐Agramonte, Yamirka; Kröner, Alfred; Cambra, K. Núñez; Millán, Guillermo; Torres‐Roldán, R. L.; Carrasquilla, S.

doi:10.1007/s00410-008-0367-0

Cited by 66 publications

(38 citation statements)

References 23 publications

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“…The miscibility gap between omphacite and jadeite solid solutions narrows with increasing temperature and acmite content, and has been used to estimate crystallization temperature of jadeitite (e.g. García‐Casco et al ., ). The observed compositional variation in omphacite and impure jadeite in the jadeite‐bearing kyanite eclogite can be approximately expressed as pseudobinary diopside (Di 66 Hd 14 Acm 20 )–jadeite (Jd 100 ) solid solution (Fig.…”

Section: Conditions Of Metamorphismmentioning

confidence: 97%

Petrogenesis and implications of jadeite‐bearing kyanite eclogite from the Sanbagawa belt (SW Japan)

Endo

Tsuboi

2013

Journal Metamorphic Geology

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Jadeite‐bearing kyanite eclogite has been discovered in the Iratsu body of the Sanbagawa belt, SW Japan. The jadeite + kyanite assemblage is stable at higher pressure–temperature (P–T) conditions or lower H2O activity [a(H2O)] than paragonite, although paragonite‐bearing eclogite is common in the Sanbagawa belt. The newly discovered eclogite is a massive metagabbro with the peak‐P assemblage garnet + omphacite + jadeite + kyanite + phengite + quartz + rutile. Impure jadeite is exclusively present as inclusions in garnet. The compositional gap between the coexisting omphacite (P2/n) and impure jadeite (C2/c) suggests relatively low metamorphic temperatures of 510–620 °C. Multi‐equilibrium thermobarometry for the assemblage garnet + omphacite + kyanite + phengite + quartz gives peak‐P conditions of ~2.5 GPa, 570 °C. Crystallization of jadeite in the metagabbro is attributed to Na‐ and Al‐rich effective bulk composition due to the persistence of relict Ca‐rich clinopyroxene at the peak‐P stage. By subtracting relict clinopyroxene from the whole‐rock composition, pseudosection modelling satisfactorily reproduces the observed jadeite‐bearing assemblage and mineral compositions at ~2.4–2.5 GPa, 570–610 °C and a(H2O) >0.6. The relatively high pressure conditions derived from the jadeite‐bearing kyanite eclogite are further supported by high residual pressures of quartz inclusions in garnet. The maximum depth of exhumation in the Sanbagawa belt (~80 km) suggests decoupling of the slab–mantle wedge interface at this depth.

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Section: Conditions Of Metamorphismmentioning

confidence: 97%

Petrogenesis and implications of jadeite‐bearing kyanite eclogite from the Sanbagawa belt (SW Japan)

Endo

Tsuboi

2013

Journal Metamorphic Geology

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“…The rock type is a very important key data item in archaeological research, and jadeitite and omphacitite are not so common on Earth. Thus, the known nearby Central and South American and Caribbean localities of eclogite‐facies rocks provide potential source areas, several of which are on or close to a coastline that might have facilitated transport: the Acatlán Complex of eclogites, Puebla State, southern Mexico; the Motagua River Valley, Guatemala; Margarita Island, Venezuela, the Sierra del Convento, Cuba; and the Rio San Juan Complex, Dominican Republic . Although a portable RS analytical operation like this one cannot distinguish between these potential sites, at least it can confirm the presence of Jd‐rich clinopyroxene, and that is not a negligible achievement.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, jadeite‐jade occurrences are relatively rare elsewhere in the world because jadeite‐jade is an unusual rock type crystallised in special metasomatic conditions under the very high geodynamic pressures created by plate tectonic collision and subduction. Rare geological jadeitite, but usually not of the gemmological quality called jade, occurs in the Nybö eclogite, Norway and has recently been found on the islands of Cuba, Dominican Republic and Corsica. Jadeite in smaller quantities in a rock is not so rare and occurs as a key mineral at many blueschist and eclogite localities worldwide.…”

Section: Introductionmentioning

confidence: 99%

Portable Raman verification and quantification of jade in Olmec ceremonial axes from El Manatí, Veracruz, Mexico

Giligny¹,

Smith

Masson³

et al. 2017

J Raman Spectroscopy

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The El Manatí archaeological site in Veracruz State, Mexico, is famous for its deposits of ceremonial stone axes and beads from the Olmec culture. Some of these have been considered to be in jadeite‐jade, but this rock type in these artefacts has never before been physico‐chemically verified. A portable Raman spectrometer was employed in situ inside the Centro‐INAH Veracruz reserve for this remote analytical operation of non‐destructive direct hand‐held analysis to identify some of the mineral species present. The key points of interest were as follows: which objects can correctly be called ‘jade’ because they contain the high‐pressure minerals jadeite or omphacite and, if so, with what mol. % Jd (Jd%) in the solid‐solution jadeite–diopside–hedenbergite. The Jd% value was then quantified from the wavenumber shift of the symmetric Si–O–Si Raman vibration band. Although some artefacts did not yield any usable Raman spectra, exploitable spectra were obtained from 41 stone axes or beads. Jadeite was found in 13 artefacts and omphacite in another 11. Jd% varied from 95 to 38% such that many of these jades are actually omphacite‐jade rather than jadeite‐jade. The complicated terminology of jades is thus re‐examined. A partial correlation is shown to exist between the Jd% value and the density of the artefacts. These results provide important, hitherto unknown, mineralogical data for archaeologists studying artefacts at different horizons at different sites of Mesoamerican cultures. These results also allow these artefacts to be now labelled correctly in their Museum reserve or exhibition display. Copyright © 2017 John Wiley & Sons, Ltd.

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“…The temperature condition is almost the same as that of the Monviso jadeitite, Italian Alps (Compagnoni et al, 2012), although the pressure condition is lower than that of the Monviso. The pressure condition is, however, apparently higher than that of quartz-free jadeitites such as Sierra del Convento (SC), Cuba (García-Casco et al, 2009), Northern Motagua mélange (NMM), Guatemala (Tsujimori et al, 2006), and Rio San Juan complex (RSJC2), Dominican Republic . Ar a laser-fusion age of single-grains of muscovite and phlogopite in the matrix of the Tone jadeitite, as the muscovite ages are 90-80 Ma, and the phlogopite ages are~65 Ma.…”

Section: Pressure-temperature Conditionsmentioning

confidence: 99%

Jadeitites and associated metasomatic rocks from serpentinite mélanges in the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan: a review

Nishiyama

Mori

Shigeno

2017

Journal of Mineralogical and Petrological Sciences

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The Nishisonogi jadeitite is a peculiar example among Japanese jadeitites in terms of the age of formation and its genesis as metasomatic replacement (R-type). The Nishisonogi jadeitite is characterized by jadeite with a quartzinclusion-rich core and quartz-free rim. The pressure-temperature (P-T ) conditions of the Nishisonogi jadeitite is constrained by the assemblage of jadeite + quartz and of clinozoisite + paragonite + quartz. The jadeitite occurs as tectonic blocks in a sepentinite mélange together with metasomatic rocks such as omphacitite, albitite and zoisite rock. The protolith of the jadeitite is likely plagiogranite or adakitic granite as suggested by the rare earth element (REE) pattern of zircon. The zircon has a euhedral core with a U-Pb age of 126 ± 6 Ma with exhibiting sharp and flat boundary with metamorphic rim, which has a U-Pb age of 84 ± 6 Ma. The rim age is almost consistent with the 95-90 Ma age of the peak metamorphism of the coherent schists, as a host of the serpentinite mélange, as determined by 40 Ar/ 39Ar method applied to glaucophane and phengite. Some jadeitite blocks show lithological zonations with albitite and other rocks in scale of several tens of centimeters. These zonations likely formed in the stability field of albite during exhumation of the serpentinite mélange. The isocon analysis of whole rock compositions and the singular value decomposition analysis of mineral reactions show that SiO 2 , Na 2 O, and Fe 2 O 3 evolved from the jadeitite towards serpentinite according to the retrograde reactions.

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A new jadeitite jade locality (Sierra del Convento, Cuba): first report and some petrological and archeological implications

Cited by 66 publications

References 23 publications

Petrogenesis and implications of jadeite‐bearing kyanite eclogite from the Sanbagawa belt (SW Japan)

Petrogenesis and implications of jadeite‐bearing kyanite eclogite from the Sanbagawa belt (SW Japan)

Portable Raman verification and quantification of jade in Olmec ceremonial axes from El Manatí, Veracruz, Mexico

Jadeitites and associated metasomatic rocks from serpentinite mélanges in the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan: a review

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