Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pepi..189..185h&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 189, Issue 3, p. 185-191.
Physics
Scientific paper
Noble gas isotopic ratios provide unique and important constraints for the evolution of the subcontinental mantle. We present one-step crushing noble gas isotope data from corundum and co-existing mantle xenoliths and megacrystals from the Changle volcanic fields in the middle part of the Tan-Lu Fault Zone, eastern North China Craton. The 3He/4He ratio is 7.6-8.3 times the atmospheric ratio (Ra) in corundum, indicating contributions of fluids from convective asthenosphere. The 3He/4He ratio in titanomagnetite megacrystals ranges from 5.8 to 6.5 Ra, suggesting possible U-Th contamination in the crystal lattice, with the 3He/4He ratio of host magma being higher than 6.5 Ra. The olivine and opx in lherzolite show high helium contents and homogeneous isotopic helium ratios (6.9-7.0 Ra). The cpx in wehrlite show significantly higher helium contents and slightly higher helium ratio (7.6 Ra) than co-existing olivine (7.0-7.5 Ra). Combined with isotope correlation diagrams, the systematic difference in 4He abundance, the 3He/4He and 4He/40Ar∗ ratios of cpx, opx and olivine in pyroxenite, lherzolite and wehrlite suggest comprehensive refertilization of lithospheric mantle in the eastern North China Craton.
He Huaiyu
Saxton John
Zhu Rixiang
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