Water contents of the Cenozoic lithospheric mantle beneath the western part of the North China Craton: Peridotite xenolith constraints

Xia, Qunke; Hao, Yawei; Liu, Shaochen; Gu, Xiaotong; Feng, Min

doi:10.1016/j.gr.2012.01.010

Cited by 64 publications

(48 citation statements)

References 66 publications

(131 reference statements)

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“…Previous studies have shown that NCC has lost its ancient lithospheric mantle root (e.g., Fan et al, 2000). Water in clinopyroxene phenocrysts of Mesozoic basalt derived from this cratonic mantle indicates the water contents were once very high at least in some regions of NCC (Xia et al, 2013b). Therefore, water might play an important role in the loss of the NCC lithospheric mantle root (Xia et al, 2013b), consistent with that mantle re-hydration may have induced viscosity reduction, resulting in its lithospheric thinning in Colorado plateau Li et al, 2008).…”

Section: Hydrolytic Weakening and Craton Stabilitymentioning

confidence: 90%

“…This method does not need polarizer and hence the mineral grain is not required to be orientated, which sometimes can greatly simplify sample analysis procedure. This simplified method has been applied to olivine Withers, 2013;Doucet et al, 2014) and clinopyroxene (Xia et al, 2013b;Liu et al, 2015). However, the flawed error analysis used to justify the correction scheme in this method may result in inappropriate estimation of the total absorbance (Withers, 2013).…”

Section: Polarization Of Infrared Lightmentioning

confidence: 99%

“…Furthermore, olivine is weaker than pyroxene (Yamamoto et al, 2008). Therefore, water plays a key role in controlling mantle viscosity, and hence the stability of cratonic lithospheric mantle (e.g., Li et al, 2008;Yang et al, 2008;Peslier et al, 2010;Xia et al, 2013b;Doucet et al, 2014;Hui et al, 2015). The convective stability analysis has suggested that the olivine water content may not be higher than 10 ppmw in an intrinsically stable cratonic lithospheric mantle (Katayama and Korenaga, 2011).…”

Section: Hydrolytic Weakening and Craton Stabilitymentioning

confidence: 99%

“…The water contents of parental magma of Salina calc-alkaline basalt and Taihangshan alkali basalt inferred from water in clinopyroxene phenocrysts of mafic lavas are 0.4-3.7 wt% (Nazzareni et al, 2011) and 0.20-1.07 wt% (Liu et al, 2015) respectively. The high water contents in the upper mantle source regions of Mesozoic and Cenozoic basalts (>1000 and 290 ppmw respectively) from North China craton (NCC), which was inferred from clinopyroxene phenocrysts in basalts, may both be related to the subducted material (Xia et al, 2013b;Xu et al, 2014). It has been further suggested that the multi-stage subduction of oceanic plates may result in water enrichment in the mantle lithosphere of NCC, which might have led to the removal of the root of NCC (Xia et al, 2013b).…”

mentioning

confidence: 99%

“…The high water contents in the upper mantle source regions of Mesozoic and Cenozoic basalts (>1000 and 290 ppmw respectively) from North China craton (NCC), which was inferred from clinopyroxene phenocrysts in basalts, may both be related to the subducted material (Xia et al, 2013b;Xu et al, 2014). It has been further suggested that the multi-stage subduction of oceanic plates may result in water enrichment in the mantle lithosphere of NCC, which might have led to the removal of the root of NCC (Xia et al, 2013b). The water content of the "primitive" magma inferred from clinopyroxene phenocrysts in Shuangliao Cenozoic intraplate basalts varies from 0.9 to 3.06 wt%, within the range of back-arc basin basalts (BABBs) and island arc basalts (IABs) .…”

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confidence: 99%

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On water in nominally anhydrous minerals from mantle peridotites and magmatic rocks

Hui

Pan

2016

Sci. China Earth Sci.

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Trace amount of water associated with the lattice defects of nominally anhydrous minerals (NAMs) can be measured using Fourier transform infrared spectroscopy (FTIR) and secondary ion mass spectrometry (SIMS). Lots of data on water in NAMs from different lithologies, especially mantle peridotite xenoliths, have been published. The water distribution in olivine from peridotite xenoliths often displays a diffusion profile with high water concentration in the core and low at the rim, which indicates water loss via diffusion during the ascent of host magma. On the other hand, water is homogeneously distributed in pyroxene and its concentration is typically interpreted to represent a mantle value. The water concentration of magma in equilibrium with NAM can be estimated using specific partition coefficient, from which the water content of parental magma and the mantle source can be inferred. The accuracy of this method, however, depends on the selection of appropriate partition coefficient for the system. Using hydrogen isotope compositions and H 2 O/Ce ratios of mantle NAMs, water source regions can be traced and water heterogeneity can be mapped in the upper mantle. Water plays an important role in the stability of cratonic mantle. The water contents and vertical distribution patterns can be significantly different among different cratonic mantles, which may result from different geologic activities. However, the mantle-plume interaction may not necessarily result in significant change of water content in cratonic mantle. The estimation of the water content in the upper mantle is still largely based on geochemical models due to the limitations of data on water in mantle NAMs.Keywords Nominally anhydrous minerals, Fourier transform infrared spectroscopy, Craton stability, Water in the upper mantle, Magma ascent rate, Water in magma Citation:Hui H J, Xu Y J, Pan M E. 2016. On water in nominally anhydrous minerals from mantle peridotites and magmatic rocks.

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Section: Hydrolytic Weakening and Craton Stabilitymentioning

confidence: 90%

Section: Polarization Of Infrared Lightmentioning

confidence: 99%

Section: Hydrolytic Weakening and Craton Stabilitymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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On water in nominally anhydrous minerals from mantle peridotites and magmatic rocks

Hui

Pan

2016

Sci. China Earth Sci.

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Plume‐cratonic lithosphere interaction recorded by water and other trace elements in peridotite xenoliths from the Labait volcano, Tanzania

Huang

Peslier

Rudnick

et al. 2015

Geochem Geophys Geosyst

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Water and other trace element concentrations in olivine (1-39 ppm H 2 O), orthopyroxene (10-150 ppm H 2 O), and clinopyroxene (16-340 ppm H 2 O) of mantle xenoliths from the Labait volcano, located on the edge of the Tanzanian craton along the eastern branch of the East African Rift, record melting and subsequent refertilization by plume magmas in a stratified lithosphere. These water contents are at the lower end of the range observed in other cratonic mantle lithospheres. Despite correlations between water content and indices of melting in orthopyroxene from the shallow peridotites, and in both olivine and orthopyroxene from the deep peridotites, water concentrations are too high for the peridotites to be simple residues. Instead, the Labait water contents are best explained as reflecting interaction between residual peridotite with a melt having relatively low water content (<1 wt.% H 2 O). Plume-derived melts are the likely source of water and other trace element enrichments in the Labait peridotites. Only garnet may have undergone addition of water from the host magma as evidenced by water content increasing toward the kelyphite rim in one otherwise homogeneous garnet. Based on modeling of the diffusion profile, magma ascent occurred at 4-28 m/s. In summary, plume-craton interaction appears to result in only moderate water enrichment of the lithosphere.

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Water in Hawaiian peridotite minerals: A case for a dry metasomatized oceanic mantle lithosphere

Peslier

Bizimis

2015

Geochem Geophys Geosyst

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The distribution of water concentrations in the oceanic upper mantle has drastic influence on its melting, rheology, and electrical and thermal conductivities and yet is primarily known indirectly from analyses of OIB and MORB. Here, actual mantle samples, eight peridotite xenoliths from Salt Lake Crater (SLC) and one from Pali in Oahu in Hawaii were analyzed by FTIR. Water contents of orthopyroxene, clinopyroxene, and the highest measured in olivine are 116-222, 246-442, and 10-26 ppm weight H 2 O, respectively. Although pyroxene water contents correlate with indices of partial melting, they are too high to be explained by simple melting modeling. Mantle-melt interaction modeling reproduces best the SLC data. These peridotites represent depleted oceanic mantle older than the Pacific lithosphere that has been refertilized by nephelinite melts containing <5 weight % H 2 O. Metasomatism in the Hawaiian peridotites resulted in an apparent decoupling of water and LREE that can be reconciled via assimilation and fractional crystallization. Calculated bulk-rock water contents for SLC (50-96 ppm H 2 O) are on the low side of that of the MORB source (50-200 ppm H 2 O). Preceding metasomatism, the SLC peridotites must have been even drier, with a water content similar to that of the Pali peridotite (45 ppm H 2 O), a relatively unmetasomatized fragment of the Pacific lithosphere. Moreover, our data show that the oceanic mantle lithosphere above plumes is not necessarily enriched in water. Calculated viscosities using olivine water contents allow to estimate the depth of the lithosphere-asthenosphere boundary beneath Hawaii at 90 km.

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Water contents of the Cenozoic lithospheric mantle beneath the western part of the North China Craton: Peridotite xenolith constraints

Cited by 64 publications

References 66 publications

On water in nominally anhydrous minerals from mantle peridotites and magmatic rocks

On water in nominally anhydrous minerals from mantle peridotites and magmatic rocks

Plume‐cratonic lithosphere interaction recorded by water and other trace elements in peridotite xenoliths from the Labait volcano, Tanzania

Water in Hawaiian peridotite minerals: A case for a dry metasomatized oceanic mantle lithosphere

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