This paper reports the first discovery of basic igneous rocks in Bairin Right Banner southeastern Inner Mongolia, China. To understand genesis and tectonic evolution these rocks, we have carried out geochronology geochemistry research on them. The results show that LA-ICP-MS zircon U-Pb concordant mean ages massive basalt, diabase, pillow basalt are 272.0 ± 2.8 Ma, 261.5 3.2 256.5 2.5 respectiv...

The Alada? melange is located between Mesozoic Tauride carbonate platform units and the Late Cretaceous Pozant?-Karsant? ophiolite its metamorphic sole. comprises a lower, mainly sedimentary unit, composed of variably disrupted thrust sheets deep-sea sediments, with localized matrix mass-flow turbidity current deposits. upper, volcanic-sedimentary highly basalt-pelagic carbonate-radiolarite uni...

Observed enrichments of N (and the δ15N of this N) in volcanic glasses altered on Earth's modern and ancient seafloor are relevant in considerations of modern global N subduction fluxes and ancient life on Earth, and similarly altered glasses on Mars and other extraterrestrial bodies could serve as valuable tracers of biogeochemical processes. Palagonitized glasses and whole-rock samples of vol...

MO, Fuhrer J, Satten GA, et a1. Declining morbidity and mortality among patients with advanced immunodeficiency virus infection. N Engl J Med 1998; 338:853-60. 3. Burman"W], Reves RR, Cohn DL. The case for conservative management of early HIV disease. JAMA 1998; 280:93-5. 4. UNAlDS. The Joint United Nations Programme on HIVIAlDS. Report on the global HIVIAlDS epidemic:June 1998. (www.us.unaids....

[1] Helium isotopes are a robust geochemical tracer of a primordial mantle component in hot spot volcanism. The high He/He (up to 35 RA, where RA is the atmospheric He/He ratio of 1.39 10 ) of some Hawaiian Island volcanism is perhaps the classic example. New results for picrites and basalts from the Hawaiian-Emperor seamount chain indicate that the hot spot has produced high He/He lavas for at...