Felsic volcanic rocks are an important source for generating ion adsorption-type rare earth
element (REE) resources. To better understand the supergene enrichment of REEs related …

Trace element mobility has been studied in spheroidally weathered corestone–shell
complexes developed on Late Tertiary and Quaternary volcanic rocks. The parent materials …

Progressive alteration by seawater of an andesite in the Aegean Island of Milos and an
ignimbrite in the Aegean Island of Kimolos, Greece, formed bentonites with or without …

Geological, mineralogical and geochemical studies were carried out on Mayouom kaolin
deposit located within a mylonitic shear zone about 30 km north of Foumban town (western …

To understand the factors that control rare earth elements (REE) release and fractionation
during shale weathering, we investigate the REE contents in solid (bedrock, regolith, stream …

We systematically investigated six soil profiles developed on a climosequence of gray shale
to constrain the mobility and fractionation of rare earth elements (REE) during chemical …

Major, trace element concentrations and Nd, Sr isotope ratios were measured in micro-
drilled samples of a 2.37 Ga-old, hand-specimen sized spheroidally weathered diabase …

At Cerro Rubio area, the stratigraphic position and the origin of kaolinization have been a
matter of controversy. Most of the residual kaolin deposits of Patagonia, Argentina are …

Paleo-weathering crust rare earth element (REE) sedimentary ores (PWREOs)(on-site
weathering profiles (paleosols) and allogene deposits (claystones)) related to weathering of …

Mineralogy and Geochemistry of the Sedimentary Kaolin Deposits From Sinai, Egypt:
Implications for Control by the Source Rocks—Mineralogical and geochemical variations …