The rare earth elements (REE) are composed of the Lanthanide Series of 15 elements with atomic numbers (57) through (71) and yttrium (39). Because of their geochemical behavior, REE rarely form their own minerals and more commonly are found incorporated within the structure of other minerals. There is growing concern over the economical availability of REE because of their diverse and expanding...

Molecular organic geochemical proxies are increasingly being utilized to reconstruct past environmental conditions as new tools continue to be discovered and developed. To date, organic geochemical proxies have been developed mainly for use in marine systems and are widely used in paleoceanography. In contrast, organic proxies have been less commonly used on lacustrine sedimentary records. One ...

A two-dimensional model for colloid transport in geochemically and physically heterogeneous porous media is presented. The model considers patchwise geochemical heterogeneity, which is suitable to describe the chemical variability of many surficial aquifers with ferric oxyhydroxide-coated porous matrix, as well as spatial variability of hydraulic conductivity, which results in heterogeneous flo...

Microbial communities and their associated metabolic activity in marine sediments have a profound impact on global biogeochemical cycles. Their composition and structure are attributed to geochemical and physical factors, but finding direct correlations has remained a challenge. Here we show a significant statistical relationship between variation in geochemical composition and prokaryotic comm...

In conjunction with bedrock mapping (MacIntyre et al., 1996, this volume) and regional till geochemistry surveys @IuntIey et al., 1996, this volume) in the Babine Lake area, detailed drift exploration studies were undertaken on five porphyry-related copper properties: Babs, Heame Hill, Lennac Lake,, Bell mine (Newman Peninsula), and Saddle Hill (Figure 1). The objective of our study was to inve...

Geochemical characterization in stream sediments from Nyambaka locality was carried out on ten samples collected the study area watershed. The distribution of trace metals showed that some lithophiles (Be, Sc, V, Cr, Sr, Th, U), chalcophiles (Cu, Zn, Ga, As) and siderophiles (Mn, Co, Ni, Mo) have high average contents compared to their concentration upper crust. From factorial analysis componen...

Abstract Wadi Abu Subeira area contains many farms and houses is one of the promising areas for iron mining. Therefore, 21 surface soil samples were collected investigated toxic heavy metals (Pb, Cr, Ni, Cu, Zn, Co, As) using inductively coupled plasma (ICP) to establish a geochemical baseline these during pre-mining conditions. To decipher sources their interrelationships, multivariate statist...