Trace element partitioning between phlogopite, clinopyroxene and leucite lamproite melt

Schmidt, Kati; Bottazzi, P.; Vannucci, R.; Mengel, K.

doi:10.1016/s0012-821x(99)00056-4

Cited by 124 publications

(49 citation statements)

References 35 publications

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“…This means that the ancient and enriched lithospheric mantle had been almost entirely removed during the late Mesozoic to Cenozoic thinning. Wang et al (1998) and Zheng (1999) reported Schmidt et al, 1999). The low ratio of phlg/cpx implies that disseminated rather than vein phlg existed in the melting source for the late Mesozoic NCB mafic magmatism.…”

Section: Comparison With Cenozoic and Early Paleozoic Lithospheric Mamentioning

confidence: 99%

“…For a metasomatized lithospheric mantle, it is usually considered that disseminated amphibole and phlogopite in the lithospheric mantle generally has HFSE depletion relative to LREE, whereas veined phlogopite has no or insignificant HFSE anomalies (Bedini et al, 1997;Foley et al, 1996;Ionov et al, 1997). The Sr and Nd isotopic evolution depends on the modal proportion of clinopyroxene (cpx) and phlogopite (phlg) (Schmidt et al, 1999). For instance, cpx is responsible for the evolution of radiogenic Nd whereas Sr isotopic ratios depends on the modal proportion of cpx/phlg since the influence of phlg on the Nd-isotope evolution is negligible because of its low partition coefficients for Sm and Nd (Ionov et al, 1997;Schmidt et al, 1999).…”

Section: Mantle Source For Late Mesozoic Basaltic Magmas In Ncbmentioning

confidence: 99%

“…The Sr and Nd isotopic evolution depends on the modal proportion of clinopyroxene (cpx) and phlogopite (phlg) (Schmidt et al, 1999). For instance, cpx is responsible for the evolution of radiogenic Nd whereas Sr isotopic ratios depends on the modal proportion of cpx/phlg since the influence of phlg on the Nd-isotope evolution is negligible because of its low partition coefficients for Sm and Nd (Ionov et al, 1997;Schmidt et al, 1999). Thus melts derived from veined phlgbearing peridotites will occupy distinguishable trace element and Sr-Nd isotopic features (e.g., the degree of HFSE anomalies and initial Sr-Nd isotopic compositions) from those derived by melting of peridotites with disseminated phlogopite.…”

Section: Mantle Source For Late Mesozoic Basaltic Magmas In Ncbmentioning

confidence: 99%

See 2 more Smart Citations

Geochemistry of late Mesozoic mafic magmatism in west Shandong Province, eastern China: Characterizing the lost lithospheric mantle beneath the North China Block.

Guo

Wang

et al. 2003

Geochem. J.

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Section: Comparison With Cenozoic and Early Paleozoic Lithospheric Mamentioning

confidence: 99%

Section: Mantle Source For Late Mesozoic Basaltic Magmas In Ncbmentioning

confidence: 99%

Section: Mantle Source For Late Mesozoic Basaltic Magmas In Ncbmentioning

confidence: 99%

See 1 more Smart Citation

Geochemistry of late Mesozoic mafic magmatism in west Shandong Province, eastern China: Characterizing the lost lithospheric mantle beneath the North China Block.

Guo

Wang

et al. 2003

Geochem. J.

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“…Four experimental studies of Pb and REE partitioning between cpx, garnet and silicate melt show D Ce /D Pb values ranging from 3-10 for cpx, and from 3-500 for garnet Lundstrom et al 1998;Salters et al 2002;Schmidt et al 1999). In contrast, data from Klemme et al (2002) and Keshav et al (2005) Hofmann et al (1986) proposal that Ce and Pb have similar partition coefficients during mantle melting, at least if Ce and Pb partitioning are controlled simply by silicate phases.…”

Section: Introductionmentioning

confidence: 97%

Mantle Pb paradoxes: the sulfide solution

Hart

Gaetani

2006

Contrib Mineral Petrol

116

108

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There is growing evidence that the budget of Pb in mantle peridotites is largely contained in sulfide, and that Pb partitions strongly into sulfide relative to silicate melt. In addition, there is evidence to suggest that diffusion rates of Pb in sulfide (solid or melt) are very fast. Given the possibility that sulfide melt 'wets' sub-solidus mantle silicates, and has very low viscosity, the implications for Pb behavior during mantle melting are profound. There is only sparse experimental data relating to Pb partitioning between sulfide and silicate, and no data on Pb diffusion rates in sulfides. A full understanding of Pb behavior in sulfide may hold the key to several long-standing and important Pb paradoxes and enigmas. The classical Pb isotope paradox arises from the fact that all known mantle reservoirs lie to the right of the Geochron, with no consensus as to the identity of the "balancing" reservoir. We propose that long-term segregation of sulfide (containing Pb) to the core may resolve this paradox.Another Pb paradox arises from the fact that the Ce/Pb ratio of both OIB and MORB is greater than bulk earth, and constant at a value of 25. The constancy of this "canonical ratio" implies similar partition coefficients for Ce and Pb during magmatic processes (Hofmann et al. 1986), whereas most experimental studies show that Pb is more incompatible in silicates than Ce. Retention of Pb in residual mantle sulfide during melting has the potential to bring the bulk partitioning of Ce into equality with Pb if the sulfide melt/silicate melt partition coefficient for Pb has a value of ~ 14. Modeling shows that the Ce/Pb (or Nd/Pb) of such melts will still accurately reflect that of the source, thus enforcing the paradox that OIB and MORB mantles have markedly higher Ce/Pb (and Nd/Pb) than the bulk silicate earth. This implies large deficiencies of Pb in the mantle sources for these basalts. Sulfide may play other important roles during magmagenesis: 1). advective/diffusive sulfide networks may form potent metasomatic agents (in both introducing and obliterating Pb isotopic heterogeneities in the mantle); 2). silicate melt networks may easily exchange Pb with ambient mantle sulfides (by diffusion or assimilation), thus 'sampling' Pb in isotopically heterogeneous mantle domains differently from the silicate-controlled isotope tracer systems (Sr, Nd, Hf), with an apparent 'de-coupling' of these systems.

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“…De hecho, este modelo podría explicar en cierta medida la razón por la cual el magmatismo potásico se diluye hacia la porción oriental del arco mexicano, pues la infl uencia de la Sierra Madre Occidental se limita a las longitudes de la cuenca de México (Righter y RosasElguera, 2001). Sin embargo, y aunque esta hipótesis podría parecer tectónicamente atractiva, no es capaz de explicar la razón por la cual las rocas alcalino-potásicas y las rocas calcialcalinas del arco tienen prácticamente la misma composición isotópica de Sr. Esta peculiaridad composicional está lejos de ser un fenómeno trivial pues la fl ogopita, el mineral que aparentemente es el responsable de formar los magmas alcalino-potásicos, acepta con facilidad al Rb (D Rb >1) pero no incorpora grandes cantidades de Sr (D Sr <1) (Schmidt et al, 1999). Por lo tanto, si el metasomatismo modal es un fenómeno que ocurrió hace varios millones de años, parecería inevitable que las vetas ricas en fl ogopita desarrollaran composiciones isotópicas de 87 Sr/ 86 Sr muy enriquecidas en un tiempo relativamente corto, debido a que la relación Rb/Sr de la fl ogopita es mayor que la del manto peridotítico que las engloba.…”

Section: Rocas Alcalinas Potásicasunclassified

Petrogénesis ígnea de la Faja Volcánica Transmexicana

Gómez-Tuena¹,

Orozco-Esquivel²,

Ferrari³

2005

BSGM

113

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C i e n A ñ o s ResumenLa extraordinaria diversidad magmática de la Faja Volcánica Transmexicana está controlada (directa o indirectamente) por dos placas oceánicas independientes cuyos parámetros geofísicos y composicionales se modifi can constantemente a lo largo de la trinchera, por un régimen tectónico esencialmente distensivo que opera con distinta intensidad sobre la placa continental, por un basamento cortical con diferentes edades, espesores y composiciones, y por una fuente mantélica primaria de composición extremadamente variable que ha sido infl uenciada, en mayor o menor medida, por los agentes químicos derivados de la subducción. El régimen tectónico convergente y, en consecuencia, el arco magmático, tampoco han evolucionado de forma homogénea a lo largo su historia, sino que han mostrado transformaciones notables en su posición, geometría y composición. Por estos motivos, la Faja Volcánica Transmexicana es el resultado de uno de los sistemas tectónicos convergentes más complejos del planeta, el objeto de más de un siglo de investigaciones científi cas, y también el centro de las controversias más notables sobre la geología mexicana.Palabras clave: Faja Volcánica Transmexicana, México, subducción, arco magmático, petrología ígnea, manto, corteza. Abstract The magmatic diversity of the Transmexican Volcanic Belt is directly or indirectly controlled by two independent oce-

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Trace element partitioning between phlogopite, clinopyroxene and leucite lamproite melt

Cited by 124 publications

References 35 publications

Geochemistry of late Mesozoic mafic magmatism in west Shandong Province, eastern China: Characterizing the lost lithospheric mantle beneath the North China Block.

Geochemistry of late Mesozoic mafic magmatism in west Shandong Province, eastern China: Characterizing the lost lithospheric mantle beneath the North China Block.

Mantle Pb paradoxes: the sulfide solution

Petrogénesis ígnea de la Faja Volcánica Transmexicana

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