The Depleted Mantle Component in Kerguelen Archipelago Basalts: Petrogenesis of Tholeiitic-Transitional Basalts From the Loranchet Peninsula

The petrogenesis of the Apollo 14 high-Al mare basalts

In this paper, we report analysis of various basaltic lunar samples including 14053 and 14072, KREEP basalt 15386, thirty basalt clasts from Apollo 14 breccia 14321, as well as impact-generated samples (matrix from breccia 14168, olivine vitrophyres 14321,1180 and 14321,1539, and impact melt 14310) using a combination of solution and laser ablation inductively coupled plasma mass spectrometry (...

Heterogeneity in mantle carbon content from CO2-undersaturated basalts

The amount of carbon present in Earth's mantle affects the dynamics of melting, volcanic eruption style and the evolution of Earth's atmosphere via planetary outgassing. Mantle carbon concentrations are difficult to quantify because most magmas are strongly degassed upon eruption. Here we report undegassed carbon concentrations from a new set of olivine-hosted melt inclusions from the Mid-Atlan...

THE GEOCHEMISTRY OF CENOZOIC BASALTS AND PERIDOTITE XENOLITHS FROM HANNUOBA REGION, EASTERN CHINA: IMPLICATION FOR THEIR PETROGENESIS AND SUBCONTINENTAL MANTLE HETEROGENEITY by

The Cenozoic Hannuoba basaltic province, 200 km northwest of Beijing, China, is composed of intercalated tholeiitic, transitional and alkalic basalts. Although the alkalic basalts contain abundant upper mantle xenoliths, they range in MgO content from 5.7 to 10.6% MgO. Most of the major and trace element abundance variations in the alkalic basalts can be explained by segregation of a clinopyrox...

The constancy of upper mantle fO2 through time inferred from V/Sc ratios in basalts

The geochemical behaviors of Vand Sc during partial melting are more similar to each other than to most other elements but, in detail, the partitioning of V is redox-sensitive whereas that of Sc is not. The V/Sc ratio in basalts is shown here to be a sensitive and robust recorder of the oxygen fugacity (fO2) of their mantle source regions. The use of V/Sc ratios differs from the use of V and/or...

PETROGENESIS OF THE APOLLO 14 HIGH-Al BASALTS REVISITED: DISTINCT MAGMATIC EVENTS, SOURCE METASOMATISM, AND AFC