Tracing great fluid migrations

Article Abstract:

Metal sulphide ores from the Mississippi Valley were found to be about 377 million years old, indicating that the ores derived from the tectonic activity that was then raising up the Appalachian Mountains. The ore's relocation from the Appalachian region to the Mississippi Valley 700 kilometers away demonstrates that chemically altering fluids can move through enormous portions of the continental interior. J.C. Brannon and colleagues dated the ores using rubidium-strontium isotopes.

Usage, Natural history, Mississippi Valley, Appalachian Mountains, Rubidium-strontium dating

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Tracing the Earth's evolution

Article Abstract:

Alard and colleagues have confirmed that many rocks in the Earth's mantle have differing nobel-metal abundance signatures to meteorites.

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Geochemical evidence for terrestrial ecosystems 2.6 billion years ago

Article Abstract:

Research is presented describing the study of terrestrial biomass age identification and the methods used for measuring element ratios.

Biotic communities, Paleobiology

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