Leg 209 was devoted to drilling mantle peridotites and associated gabbroic rocks along the Mid-Atlantic Ridge from 14° to 16°N. This area was identified at the 1996 Workshop on Oceanic Lithosphere and Scientific Drilling into the 21st Century (OL Workshop) as the ideal region for drilling of a strike line of short holes to sample the upper mantle in a magma-starved portion of a slow-spreading r...

Solute mass transport in porous media is strongly correlated with pore fluid flow. The analysis of solute transport is an effective means for studying medium heterogeneities. In this study, we discuss the effects of heterogeneity on the tracer transport. Assuming steady fluid flow, we have simulated tracer transport in various permeability heterogeneities. The results show that the tracer distr...

The relative apportionment of hydrocarbons (HCs) coming from mobile, fixed, and other sources (not correlated either to carbon monoxide [CO] or sulfur dioxide [SO2] emissions as solvent evaporation and biogenic sources) is calculated as previously proposed by Riveros et al.1 through the linear approximation [HC] total = [HC]0 + m1 [CO] + m2 [SO2], where m1 and m2 are fitted constants. The obtai...

Subduction zones are the primary regions on Earth today where crust recycling takes place, and through geological time they have been the sites of continent formation. Many of the key elements (e.g., Th, rare earth elements, Ba, and Be) that are important in understanding crustal growth are sequestered in the sedimentary column and in the uppermost oxidized portions of the volcanic section of o...

THENUMBER OF ELECTRONIC TEXTS in the humanities is growing fast and many libraries are seeking to acquire them from various sources or to provide access to them. Building, in part, on the experience of those scholars who work with electronic texts in literary and linguistic computing, this article surveys some issues which libraries may need to consider as they begin to establish collectiondeve...