Harzburgite to lherzolite and back again: metasomatic processes in ultramafic xenoliths from the Wesselton kimberlite, Kimberley, South Africa

Griffin, William L.; Shee, S. R.; Ryan, C.G.; Win, Tin Tin; Wyatt, B.A.

doi:10.1007/s004100050481

Cited by 249 publications

(144 citation statements)

References 24 publications

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“…The degree of metasomatism in the subcalcic garnets must have been small because the majority plot in the "depleted peridotite field" of Griffin et al (1999) in Y versus Zr space (Fig. 4a).…”

Section: Identification Of the Metasomatizing Agent In Single Grain Smentioning

confidence: 97%

Ancient mantle metasomatism recorded in subcalcic garnet xenocrysts: Temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism

Shu

Brey

2015

Earth and Planetary Science Letters

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Section: Identification Of the Metasomatizing Agent In Single Grain Smentioning

confidence: 97%

Ancient mantle metasomatism recorded in subcalcic garnet xenocrysts: Temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism

Shu

Brey

2015

Earth and Planetary Science Letters

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“…Therefore, spatial variations of trace elements (e.g., compositional zonation) of single minerals could be used to reveal the changes of temperature, pressure and/or compositions. In other words, in situ trace element analyses, e.g., secondary ion mass spectroscopy (SIMS) and laser ablation-inductivity coupled plasma mass spectrometry (LA-ICP-MS), are important for us to understand the geodynamical processes of the UHP metamorphism [16][17][18][19][20][21][22] . In the last several years, in situ trace element studies were carried out to reveal the geodynamic processes of the Dabie-Sulu UHP belt.…”

mentioning

confidence: 99%

Trace elemental records of short-lived heating during exhumation of the CCSD eclogites

Zong

Liu

et al. 2007

CHINESE SCI BULL

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Trace element compositions of garnet, omphacite and apatite in ultrahigh-pressure eclogites from the main hole of the Chinese Continental Scientific Drilling (CCSD) project were in situ analyzed by the LA-ICP-MS method. Although both garnet and omphacite have homogeneous major element compositions, their trace elements show zonations from core to rim in rare earth elements. In particular, middle rare earth elements in the garnet, heavy rare earth elements in the apatite and all rare earth elements in the omphacite increase from core to rim, respectively. Based on dependence of partition coefficients on temperature and pressure in these minerals, we suggest that the trace elemental zonations in these minerals may record a short-lived heating event during exhumation. eclogite, in situ analysis, trace element, mineral zoningThe Sulu ultrahigh pressure (UHP) metamorphic belt is an important part of the Qinling-Dabie Central Orogenic Belt in China. The main hole of the Chinese Continental Scientific Drilling (CCSD) is located at Donghai County, the southwestern part of the Sulu UHP terrain. Rocks drilled through by CCSD ever resided in the deep level of mantle beneath the convergent plate boundary, which is the best area to study the continental subduction and geodynamics [1,2] . Recent studies reveal that the eastmost Sulu UHP rocks suffered partial melting during exhumation [3] , and some eclogites in the eastern Shandong were overprinted by granulite-facies metamorphism [4][5][6][7] . Then, one important question is what causes the partial melting. To answer this question, decompression, increasing temperature and adding volatile were ever suggested. Yao et al. [7] attributed overprinting of granulite-facies metamorphism on eclogites to fluid infiltration during the exhumation. However, P-T path of coesite eclogite to granulite indicates that the overprinting of granulite-facies metamorphism was associated with heating, and the extent of temperature increasing was ~40℃ [4] . O'Brien and Vrána [8] suggested that a short-lived heating event during exhumation resulted in overprinting of granulite-facies metamorphism on the UHP eclogites in the Moldanubian Zone. The presence of corundumbearing mafic and ultramafic rock is an indicator of ultrahigh temperature [9][10][11][12] . In the Sulu UHP belt, corundum is found in eclogite enclosed in ultramafic rocks [13] and garnetite in garnet peridotite [14] . Especially, we recently found a unique mineral assemblage (garnet + corundum + spinel + quartz + feldspar) indicating (ultra-) high temperature nearby the CCSD. These observations imply that the eclogites in some parts of the Sulu UHP terrane could suffer a short-lived high-T stage during the exhumation.The thermodynamic theory of trace element partitioning between metamorphic minerals indicates that compared with major elements, trace elements are potentially more sensitive to chemical and thermobaromet-

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“…Major mantle processes such as depletion and enrichment in melt components can be investigated via petrological studies of mantle derived xenoliths (e.g., Griffin et al, 1999;Dawson, 2002;Chazot et al, 2005;Beard et al, 2006). Peridotite xenoliths from Plio Quaternary basaltic volcanic fields along the south coast of Yemen (Bir Ali Area) are upper mantle materials beneath a young rifted continental margin and provide us with information concerning deep processes of continental break up.…”

Section: Introductionmentioning

confidence: 99%

Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen — possible product of peridotite/melt reactions

Ali

Arai

2007

Journal of Mineralogical and Petrological Sciences

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Ultramafic xenoliths in Pliocene Quaternary basalts from Bir Ali, the Shabwa Governorate, southern Yemen, were studied to examine upper mantle processes related to continental rifting. They show a great variety of rock types: spinel lherzolites, harzburgites, dunites, clinopyroxene (= cpx) rich lherzolites, wehrlites and pyroxenites. The cpx rich lherzolites and wehrlites with high clinopyroxene/orthopyroxene ratios (> 1), which are characteristic of the Bir Ali xenolith suite, contain lower Fo contents of olivine than ordinary lherzolites at a given Cr# of spinel. Their clinopyroxenes are higher in TiO 2 and REE contents than those in the ordinary lherzolites, which are restite. These features strongly indicate metasomatic addition of clinopyroxene from alkali basalts at the expense of orthopyroxene to depleted peridotites for genesis of the cpx rich lherzolites. The cpx rich lherzolites are one of common constituents of lithospheric mantle at rifted continental margins.

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Harzburgite to lherzolite and back again: metasomatic processes in ultramafic xenoliths from the Wesselton kimberlite, Kimberley, South Africa

Cited by 249 publications

References 24 publications

Ancient mantle metasomatism recorded in subcalcic garnet xenocrysts: Temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism

Ancient mantle metasomatism recorded in subcalcic garnet xenocrysts: Temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism

Trace elemental records of short-lived heating during exhumation of the CCSD eclogites

Clinopyroxene-rich lherzolite xenoliths from Bir Ali, Yemen — possible product of peridotite/melt reactions

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