Using classical diffusion theory, we present a mathematical technique for the determination of 4He concentration profiles in minerals. This approach should prove useful for constraining the low-temperature cooling histories ...

We developed a technique for extracting 4He from apatite and titanite using laser heating that permits measurement of U and Th and, hence, (U-Th)/He ages, on a single sample aliquot. Unlike direct laser heating, quantitative ...

We have designed the first available experimental method capable to investigate the solubility of inert gases in H2O-CO2 bearing silicate melts in a large range of pressures. The method overcomes the difficulties imposed ...

We present data on He sorption in garnet obtained by loading garnet samples with He at 250±10 bar in the temperature range 800–990°C. For this temperature range we find a three-fold decrease in He sorption from 2.1 · 10−5 ...

The core has often been suggested as a source for He presently found in the mantle. If the core served as the long-term storage reservoir for He in ocean island basalts with distinctively high 3He/4He ratios, then the ...

Compositionally heterogeneous material may exist in the lowermost mantle [van der Hilst and Karason, Science 283 (1999) 1885-1888]. Here we use a numerical model to investigate the dynamics of (i) the subducted oceanic ...

We performed a systematic study of (U-Th)/He ages of volcanic zircons of known eruption age to establish a reliable protocol for zircon He dating and to validate the resulting ages. Using laser He extraction and dissolution ...