High-^3He Plume Origin and Temporal-Spatial Evolution of the Siberian Flood Basalts

Details High-^3He Plume Origin and Temporal-Spatial Evolution of the Siberian Flood Basalts High-^3He Plume Origin and Temporal-Spatial Evolution of the Siberian Flood Basalts

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...269..822b&link_type=abstract

Science, Volume 269, Issue 5225, pp. 822-825

Physics

29

Scientific paper

An olivine nephelinite from the lower part of a thick alkalic ultrabasic and mafic sequence of volcanic rocks of the northeastern part of the Siberian flood basalt province (SFBP) yielded a 40Ar/39Ar plateau age of 253.3 ± 2.6 million years, distinctly older than the main tholeiitic pulse of the SFBP at 250.0 million years. Olivine phenocrysts of this rock showed ^3He/^4He ratios up to 12.7 times the atmospheric ratio; these values suggest a lower mantle plume origin. The neodymium and strontium isotopes, rare earth element concentration patterns, and cerium/lead ratios of the associated rocks were also consistent with their derivation from a near-chondritic, primitive plume. Geochemical data from the 250-million-year-old volcanic rocks higher up in the sequence indicate interaction of this high-^3He SFBP plume with a suboceanic-type upper mantle beneath Siberia.

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