Shallow water sedimentary units are generally considered scarce in Archean greenstone belts. We describe an unusual quartz arenite-subaerial andesite association within the Archean Hisovaara greenstone belt, a fragment of the Parandovo-Tikshozero belt within the Karelian craton of the Baltic Shield. The Hisovaara greenstone belt consists of several lithotectonic assemblages: (1) a komatiite-tho...

Rhythmically deposited argillites of the Gowganda Formation (ca. 2.0^2.5 Ga) probably formed in a glacial setting. Drop stones and layered sedimentary couplets in the rock presumably indicate formation in a lacustrine environment with repeating freeze^thaw cycles. It is plausible that temporal variations in the thickness of sedimentary layers are related to interannual climatic variability, e.g...

1 REGIONAL GEOLOGY 2 The northern California Coast Ranges are composed the Franciscan Complex, a penetratively 3 sheared set of metasedimentary rocks forming an accretionary prism. The Franciscan complex is 4 subdivided into three broad belts that young to the west: the Eastern, Central and Coastal belts, 5 reflecting the cumulative accretion of oceanic sediments to western North America (McLau...

Experimental studies show that compacted bentonite used as a backfill material for nuclear waste repository experiences strong coupling between chemical and mechanical processes. In this paper, we use dual-structure expansive soil model, referred to the Barcelona Expansive Model (BExM), predict behavior of buffer in subsurface emplacement tunnels high-level radioactive waste. After emplacement,...

This paper presents a modified Biot’s model for describing the hydromechanical behaviour of Callovo-Oxfordian Argillite (COx) Claystone. The COx Claystone exhibits significant deformation during water desaturation/resaturation, and standard is unable to predict large shrinkage/swelling material. authors then introduced an additional swelling/shrinkage law simulate deformations upon changes in c...

The redox-sensitive geochemical behavior of uranium permits the use of Th/U ratios as a geochemical proxy for the oxidation state of the atmosphere and oceans during sedimentary processes. Due to the effects of post-depositional uranium mobility on Th/U ratios during events involving oxygenated fluids, direct measurements of Th/U ratios are often misleading, but the whole rock Pb isotope compos...