Calculating melting temperatures and pressures of peridotite protoliths: Implications for the origin of cratonic mantle

Lee, Cin-Ty A.; Chin, Emily

doi:10.1016/j.epsl.2014.06.048

Cited by 60 publications

(48 citation statements)

References 146 publications

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“…PRIMELT3 does not compute residuum composition, but the reader can easily do this using equation and the composition of peridotite KR4003 [ Herzberg and O'Hara , , Table 1]; in view of the above mentioned complexities, a residue so computed may be considered a “mean” composition. Satisfactory residue compositions are obtained for the major elements SiO 2 , Al 2 O 3 , FeO, MgO, and CaO, and these can be used to compute temperatures and pressures of melting [ Lee and Chin , ]. However, compared with typical peridotites of similar fertility, KR4003 is somewhat deficient in TiO 2 ,and Na 2 O, high in K 2 O, and P 2 O 5 has not been determined.…”

Section: Source Residuum Mineralogy and Compositionmentioning

confidence: 99%

“…And it is clearly not true of an aggregate fractional melt extracted from cornerflow driven melting regimes below oceanic ridges, which leave behind many residues with variable extents of depletion. PRIMELT3 does not compute residuum composition, but the reader can easily do this using equation (9) [Lee and Chin, 2014]. However, compared with typical peridotites of similar fertility, KR4003 is somewhat deficient in TiO 2 ,and Na 2 O, high in K 2 O, and P 2 O 5 has not been determined.…”

Section: Source Residuum Mineralogy and Compositionmentioning

confidence: 99%

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PRIMELT3 MEGA.XLSM software for primary magma calculation: Peridotite primary magma MgO contents from the liquidus to the solidus

Herzberg

Asimow

2015

Geochem Geophys Geosyst

322

239

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An upgrade of the PRIMELT algorithm for calculating primary magma composition is given together with its implementation in PRIMELT3 MEGA.xlsm software. It supersedes PRIMELT2.xls in correcting minor mistakes in melt fraction and computed Ni content of olivine, it identifies residuum mineralogy, and it provides a thorough analysis of uncertainties in mantle potential temperature and olivine liquidus temperature. The uncertainty analysis was made tractable by the computation of olivine liquidus temperatures as functions of pressure and partial melt MgO content between the liquidus and solidus. We present a computed anhydrous peridotite solidus in T-P space using relations amongst MgO, T and P along the solidus; it compares well with experiments on the solidus. Results of the application of PRIMELT3 to a wide range of basalts shows that the mantle sources of ocean islands and large igneous provinces were hotter than oceanic spreading centers, consistent with earlier studies and expectations of the mantle plume model.

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Section: Source Residuum Mineralogy and Compositionmentioning

confidence: 99%

Section: Source Residuum Mineralogy and Compositionmentioning

confidence: 99%

PRIMELT3 MEGA.XLSM software for primary magma calculation: Peridotite primary magma MgO contents from the liquidus to the solidus

Herzberg

Asimow

2015

Geochem Geophys Geosyst

322

239

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“…For instance, some peridotites, such as found in the Kaapvaal and Siberian cratons [e.g., Boyd et al ., ], with high Mg # (>92) contain an extremely large amount of OPX (up to 45 vol %). The excess in OPX in these samples, characterized by higher Si/Mg, is probably the result of additional petrogenetic processes (e.g., the infiltration of silicic melts or fluids), superimposed on earlier melt extraction events [ Boyd , ; Griffin et al ., ; Carlson et al ., ; Lee and Chin , ]. Refertilization of the lithospheric mantle, may also cause further changes in the mineral modes, such as the addition of Ol by a silica undersaturated melt [ Kelemen et al ., ] and of CPX and Gt by basaltic melts [e.g., Boyd et al ., ].…”

Section: Compositional Variations In the Lithospheric Mantle Under Thmentioning

confidence: 99%

Density, temperature, and composition of the North American lithosphere—New insights from a joint analysis of seismic, gravity, and mineral physics data: 2. Thermal and compositional model of the upper mantle

Tesauro

Kaban

Mooney

et al. 2014

Geochem Geophys Geosyst

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Temperature and compositional variations of the North American (NA) lithospheric mantle are estimated using a new inversion technique introduced in Part 1, which allows us to jointly interpret seismic tomography and gravity data, taking into account depletion of the lithospheric mantle beneath the cratonic regions. The technique is tested using two tomography models (NA07 and SL2013sv) and different lithospheric density models. The first density model (Model I) reproduces the typical compositionally stratified lithospheric mantle, which is consistent with xenolith samples from the central Slave craton, while the second one (Model II) is based on the direct inversion of the residual gravity and residual topography. The results obtained, both in terms of temperature and composition, are more strongly influenced by the input models derived from seismic tomography, rather than by the choice of lithospheric density Model I versus Model II. The final temperatures estimated in the Archean lithospheric root are up to 150 C higher than in the initial thermal models obtained using a laterally and vertically uniform ''fertile'' compositional model and are in agreement with temperatures derived from xenolith data. Therefore, the effect of the compositional variations cannot be neglected when temperatures of the cratonic lithospheric mantle are estimated. Strong negative compositional density anomalies (<20.03 g/cm 3 ), corresponding to Mg # (100 3 Mg/ (Mg 1 Fe)) >92, characterize the lithospheric mantle of the northwestern part of the Superior craton and the central part of the Slave and Churchill craton, according to both tomographic models. The largest discrepancies between the results based on different tomography models are observed in the Proterozoic regions, such as the Trans Hudson Orogen (THO), Rocky Mountains, and Colorado Plateau, which appear weakly depleted (>20.025 g/cm 3 corresponding to Mg # 91) when model NA07 is used, or locally characterized by high-density bodies when model SL2013sv is used. The former results are in agreement with those based on the interpretation of xenolith data. The high-density bodies might be interpreted as fragments of subducted slabs or of the advection of the lithospheric mantle induced from the eastward-directed flat slab subduction. The selection of a seismic tomography model plays a significant role when estimating lithospheric density, temperature, and compositional heterogeneity. The consideration of the results of more than one model gives a more complete picture of the possible compositional variations within the NA lithospheric mantle.

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“…Interestingly, initial lithosphere thicknesses estimated by Lee and Chin (2014) for peridotite xenoliths (Siberian, Slave, Kaapvaal, Tanzanian cratons) range from 30-150 km depth, which overlaps the current depths of MLDs of ~60 to 160 km (Selway et al, 2015).…”

Section: Frozen Rock Fabrics: Mlds As Palaeo-labsmentioning

confidence: 99%

Origins of cratonic mantle discontinuities: A view from petrology, geochemistry and thermodynamic models

Aulbach

Massuyeau

Gaillard

2017

Lithos

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Calculating melting temperatures and pressures of peridotite protoliths: Implications for the origin of cratonic mantle

Cited by 60 publications

References 146 publications

PRIMELT3 MEGA.XLSM software for primary magma calculation: Peridotite primary magma MgO contents from the liquidus to the solidus

PRIMELT3 MEGA.XLSM software for primary magma calculation: Peridotite primary magma MgO contents from the liquidus to the solidus

Density, temperature, and composition of the North American lithosphere—New insights from a joint analysis of seismic, gravity, and mineral physics data: 2. Thermal and compositional model of the upper mantle

Origins of cratonic mantle discontinuities: A view from petrology, geochemistry and thermodynamic models

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