Plants respond to Pleistocene climatic change as species, not as associations or biomes.
This has been demonstrated unequivocally by paleobotanical data for temperate latitudes …

Owing to their unique magnetic, phosphorescent, and catalytic properties, rare earths are
the elements that make possible teverything from the miniaturization of electronics, to the …

A general description of Mesozoic and Tertiary (Fortaleza) Brazilian alkaline and alkaline-
carbonatite districts is presented with reference to mineralogy, petrology, geochemistry and …

A continuous pollen history of more than 40,000 years was obtained from a lake in the
lowland Amazon rain forest. Pollen spectra demonstrate that tropical rain forest occupied the …

We have studied the oxygen and carbon isotopic compositions of carbonatite complexes
from South America (Jacupiranga, Araxá, Catalão, Tapira, and Mato Preto) and interpreted …

INFORMATION TO USERS Page 1 INFORMATION TO USERS This manuscript has been
reproduced from the microfilm master. UMI films the text directly from the original or copy …

For over 50 years, Mesozoic tholeiites, kimberlites and carbonatites from the South
American platform have been enabled the understanding of melting processes in the Earth's …

Дан сравнительный анализ геологии и минерагении карбонатитов и кимберлитов-
главных производных мантийных щелочно-ультраосновных магм. В первой части …

The Juquiá circular intrusion, which is Cretaceous in age (130–135 Ma), crops out in the
Precambrian gneissic basement in Brazil over an area of∼ 14 km2. It consists of olivine …

We report the first high-precision ID-TIMS U–Pb baddeleyite/zircon and 40 Ar/39 Ar step-
heating phlogopite age data for diabase and lamprophyre dykes and a mafic intrusion (José …