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

Zong‐Feng Yang; Jie Li; Qing‐Bao Jiang; Fei Xu; Shuang‐Yan Guo; Yue Li; Jun Zhang

doi:10.1029/2018jb016145

journal article Apr 01, 2019

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

Zong‐Feng Yang

Jie Li

Qing‐Bao Jiang Fei Xu

Shuang‐Yan Guo Yue Li

Jun Zhang

Journal of Geophysical Research: Solid Earth Vol. 124 No. 4 pp. 3458-3490 · American Geophysical Union (AGU)

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Abstract

AbstractUnderstanding 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/SiO2))3 − 0.636 * (ln (MgO/SiO2))2 − 1.850 * ln (MgO/SiO2) − 1.170, all the major elements in weight percent) is proposed to identify source lithologies for basaltic melts. When the logratios ln(K2O/Al2O3), ln (TiO2/Na2O), and ln (Na2O/K2O) 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(K2O/Al2O3) − 0.052 * ln (TiO2/Na2O) − 0.036 * ln (Na2O/K2O) * ln (Na2O/TiO2) − 0.062 * (ln (MgO/SiO2))3 − 0.641 * (ln (MgO/SiO2))2 − 1.871 * ln (MgO/SiO2) − 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/TiO2) and ln (SiO2/(CaO + Na2O + TiO2)). Thus, the chemical markers could be used to constrain source lithology and origin of natural basalts.

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Published: Apr 01, 2019
Vol/Issue: 124(4)
Pages: 3458-3490
License: View

Authors

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Zong‐Feng Yang