Partial melting of secondary pyroxenite at 1 and 1.5 GPa, and its role in upwelling heterogeneous mantle

Borghini, Giulio; Fumagalli, P.; Rampone, Elisabetta

doi:10.1007/s00410-017-1387-4

Cited by 32 publications

(19 citation statements)

References 96 publications

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“…All the experimental bulk compositions are presented in Table S1. The data are from Baasner et al (), Bartels et al (), Borghini et al (), Conceicao and Green (), Condamine and Médard (), Condamine et al (), Dasgupta et al (, , ), Davis et al (, ), Draper and Johnston (), Dvir and Kessel (), Falloon and Danyushevsky (), Foley et al (), Funk and Luth (), Gaetani and Grove (), Gerbode and Dasgupta (), Ghosh et al (), Grove et al (), Hirose and Kawamoto (), Hirose and Kawamura (), Hirose and Kushiro (), Hirose and Kushiro (), Hirose (, ), Hirschmann et al (), Keshav et al (), Kessel et al (), Kinzler (), Kinzler and Grove (), Kogiso and Hirschmann (), Kogiso et al (), Kushiro (), Lambart et al (, ), Laporte et al (, ), Longhi (), Mallik et al (, ), Medard et al (), Mitchell and Grove (), Parman and Grove (), Pertermann and Hirschmann (), Pickering‐Witter and Johnston (), Pilet et al (), Salters et al (), Schwab and Johnston (), Sobolev et al (), Sorbadere et al (), Spandler et al (), Tenner et al (), Ulmer and Sweeney (), Wagner and Grove (), Walter (), Wasylenki et al (), Whitaker et al (), Yaxley and Green (), and Yaxley and Sobolev ().…”

Section: Implications For Source Compositional and Lithological Hetermentioning

confidence: 99%

Using Major Element Logratios to Recognize Compositional Patterns of Basalt: Implications for Source Lithological and Compositional Heterogeneities

Yang

Jiang

et al. 2019

JGR Solid Earth

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Understanding the source lithology of basalts can greatly impact our understanding of magmatic processes, which can help us gain insight into mantle heterogeneity and crustal material recycling. However, many uncertainties remain about how to recognize the relationship between major element patterns of basalts and source lithological and/or compositional diversities using typical petrological methods. In this study, discriminant functional analysis and multivariate regression are carried out using major element logratios for literature experimental melts of four primitive mantle-like lherzolites and six mafic lithologies (five pyroxenites and one hornblendite). A parameter called FCMS (FCMS = ln (FeO/ CaO) − 0.058 * (ln (MgO/SiO 2 )) 3 − 0.636 * (ln (MgO/SiO 2 )) 2 − 1.850 * ln (MgO/SiO 2 ) − 1.170, all the major elements in weight percent) is proposed to identify source lithologies for basaltic melts. When the logratios ln(K 2 O/Al 2 O 3 ), ln (TiO 2 /Na 2 O), and ln (Na 2 O/K 2 O) are incorporated into FCMS, the temperature and pressure effects on the compositional heterogeneity of peridotites melts can be significantly reduced; a more powerful parameter called FCKANTMS (FCKANTMS = ln (FeO/CaO) − 0.08 * ln(K 2 O/Al 2 O 3 ) − 0.052 * ln (TiO 2 /Na 2 O) − 0.036 * ln (Na 2 O/K 2 O) * ln (Na 2 O/TiO 2 ) − 0.062 * (ln (MgO/SiO 2 )) 3 − 0.641 * (ln (MgO/ SiO 2 )) 2 − 1.871 * ln (MgO/SiO 2 ) − 1.473, all the major elements in weight percent) can be obtained. Olivine fractional crystallization and accumulation, although they can significantly change most major element contents and ratios, usually increase or decrease FCMS and FCKANTMS by only 0-0.15, which is one order of magnitude lower than their variations in the primary experimental melts of different lithologies. Importantly, approximately 80% and 50% low to moderate degree (F < 60%) partial melts (n = 303) of mafic lithology (with or without volatiles in source materials) can be distinguished from melts of peridotite and transitional lithologies when FCKANTMS combined with ln (CaO/TiO 2 ) and ln (SiO 2 / (CaO + Na 2 O + TiO 2 )). Thus, the chemical markers could be used to constrain source lithology and origin of natural basalts.Plain Language Summary Basaltic melts can be experimentally produced from a variety of mafic and ultramafic lithologies. Understanding the source lithology of basalts can greatly impact our understanding of magmatic processes, which can help us gain insight into mantle heterogeneity and crustal material recycling. However, many uncertainties remain about how to identify the source lithology of basalts using traditional petrological methods. In this study, major element patterns of experimental basaltic melts are explored using major element logratios. We find that most peridotite melts can be distinguished from pyroxenite and hornblendite melts by the logratio-based chemical markers. Thus, the chemical markers could be used to constrain source lithology and origin of natural basalts.

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Section: Implications For Source Compositional and Lithological Hetermentioning

confidence: 99%

Using Major Element Logratios to Recognize Compositional Patterns of Basalt: Implications for Source Lithological and Compositional Heterogeneities

Yang

Jiang

et al. 2019

JGR Solid Earth

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“…Run P10-1100 in our study is the only experiment that has plagioclase in the subsolidus assemblage at 1 GPa, which is in accordance with Adam et al (1992) and Lambart et al (2009), while reported the presence of plagioclase at 0.7-0.9 GPa in their subsolidus experiments. However, Lambart et al (2009) also described the presence of plagioclase in the solidus assemblage (M5-40 series), which was not observed in both this study and GV10 series in Borghini et al (2017), who attributed this to the low Na 2 O/CaO ratio of the starting pyroxenite that tends to stabilize plagioclase at lower pressure (Borghini et al, 2010;Green and Falloon, 1998). This agrees well with our study too, with YQSX-10 has the highest Na 2 O/CaO ratio of 0.084 in relative to YQSX-12 (0.043) and YQSX-19 (0.060).…”

Section: 1029/2020jb020673mentioning

confidence: 53%

“…In keeping with Lambart et al (2009) and Borghini et al (2017), our experiments (P12 and P19 series) also have spinel in the residue coexisting with cpx and olivine, possible due to the high Al 2 O 3 contents in the starting pyroxenites (15.7-17.4 wt%), whereas no residual spinel is found in the low-Al clinopyroxenite (only 2.0-5.6 wt% Al 2 O 3 ) experiments from Kogiso and Hirschmann (2001). Run P10-1100 in our study is the only experiment that has plagioclase in the subsolidus assemblage at 1 GPa, which is in accordance with Adam et al (1992) and Lambart et al (2009), while reported the presence of plagioclase at 0.7-0.9 GPa in their subsolidus experiments.…”

Section: 1029/2020jb020673mentioning

confidence: 99%

“…where Nernst partition coefficients (D i ) denotes isovalent cations in crystals and melts as a function of cation radius (r i ), the radius of the crystallographic site occupied by the cations (r 0 ), the partition coefficient (D 0 ) of the ideal or fictive cation having radius r 0 , and an elastic constant E (Young's modulus) Figure 9. Major element compositions (in wt%) of LOC melts from this study compared with those of experimental melts from peridotite and pyroxenite at similar PT conditions (Baker & Stolper, 1994;Borghini et al, 2017;Falloon et al, 2008;Kogiso & Hirschmann, 2001;Lambart et al, 2009;Pickering-Witter & Johnston, 2000;Robinson et al, 1998;Wasylenki et al, 2003). The gabbro melts are also compared here but with variable pressure range (0.2 GPa for Koepke et al, 2004;3.5-4.5 GPa for .…”

Section: Approach To Chemical Equilibriummentioning

confidence: 99%

“…Therefore, the starting pyroxenites we used in this study are silica-saturated comparing to previous studies whose starting materials are all silica deficient. Both studies of Lambart et al (2009) and Borghini et al (2017) demonstrated that at low pressures (1-1.5 GPa), partial melts from silica-deficient pyroxenites mostly plot on the right side of the CaTs-Enstatite join (Figure 8), hence the irrelevance of this thermal divide. Because of the silica-saturated pyroxenites and low pressure, the LOC melts produced in this study are consistently plotted on the right side of the CaTs-Enstatite thermal divide, without garnet in the residue.…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

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Partial Melting of the Lower Oceanic Crust: Implications for Tracing the Slab Component in the Source of Mid‐Ocean Ridge Basalts

Wang

2020

JGR Solid Earth

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The potential role of the lower oceanic crust in the source region of mid-ocean ridge basalts has been examined by a series of partial melting experiments on three natural pyroxenite xenoliths entrained in alkali basalts well representing the lower oceanic crustal material at 1 GPa, 1100-1300°C. Layered experiments were also performed to simulate the reaction between lower oceanic crust-derived melts and surrounding dunite and have successfully enabled the melt infiltration. Melt compositions are consistently basaltic and vary significantly as a function of melt fraction, and these lower oceanic crust-derived melts are characterized by high Eu/Eu*, Nb/Ta, and Ba/Th values, especially for experiments conducted at 1300°C. No reaction zone is observed in layered experiments, and our results demonstrate that the compositional variations caused by the reaction with dunitic mantle in the lower oceanic crust-derived melts are relatively minor at 1 GPa. Our melting experiments show that melting of the lower oceanic crust can provide trace element characteristics such as positive Sr and Eu anomalies and consistent Nb/Ta and Zr/Hf ratios, but it cannot account for the wide major element compositional variations (e.g., high FeO T and TiO 2 contents) in mid-ocean ridge basalt (MORB). Some component other than the surrounding dunite in the upwelling mantle flux is needed to substantially modify the major element compositions of the lower oceanic crust-derived melts. It is quite likely that these lower oceanic crust-derived melts could be extracted from the upwelling mantle while still preserving their trace element and isotopic imprintings.

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Tracking the Evolution of Magmas from Heterogeneous Mantle Sources to Eruption

Mallik

Lambart

Chin

2021

Mantle Convection and Surface Expressions

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Partial melting of secondary pyroxenite at 1 and 1.5 GPa, and its role in upwelling heterogeneous mantle

Cited by 32 publications

References 96 publications

Using Major Element Logratios to Recognize Compositional Patterns of Basalt: Implications for Source Lithological and Compositional Heterogeneities

Using Major Element Logratios to Recognize Compositional Patterns of Basalt: Implications for Source Lithological and Compositional Heterogeneities

Partial Melting of the Lower Oceanic Crust: Implications for Tracing the Slab Component in the Source of Mid‐Ocean Ridge Basalts

Tracking the Evolution of Magmas from Heterogeneous Mantle Sources to Eruption

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