Diagenesis of carbonates and clastic sediments encompasses the biochemical, mechanical, and chemical changes that occur in sediments subsequent to deposition and prior to low-grade metamorphism. These parameters which, to a large extent, control diagenesis in carbonates and clastic sediments include primary composition of the sediments, depositional facies, pore water chemistry, burial–thermal and tectonic evolution of the basin, and paleo-climatic conditions. Diagenetic processes involve widespread chemical, mineralogical, and isotopic modifications affected by the original mineralogy of carbonate and clastic sediments. These diagenetic alterations will impose a major control on porosity and permeability and hence on hydrocarbon reservoirs, water aquifers, and the presence of other important economic minerals. In this Special Issue, we have submissions focusing on understanding the interplay between the mineralogical and chemical changes in carbonates and clastic sediments and the diagenetic processes, fluid flow, tectonics, and mineral reactions at variable scales and environments from a verity of sedimentary basins. Quantitative analyses of diagenetic reactions in these sediments using a variety of techniques are essential for understanding the pathways of these reactions in different diagenetic environments.

Geological sequestration of carbon dioxide (CO2), also known as carbon capture and storage (CCS), is a technical process that involves capturing CO2 from large point sources, purifying the emissions to maximize the CO2 content, and transporting the CO2 to a storage site where it is injected, using a specially constructed well, into deep geological formations for permanent storage. This report reviews the current state of knowledge of this technology and its status, both nationally and worldwide, and the opportunities for CO2 sequestration in geological formations in the province of Ontario. With its available geologic storage capacity close to large industrial point sources of CO2, proven infrastructure and highly trained scientific and technical community, Ontario has the potential to become a world leader in carbon sequestration technology while making meaningful reductions in CO2 emissions to the atmosphere.--Document.

The present publication recording research in progress in Canadafrom May 1984 to April 1985 is the result of a survey conductedbetween January, 1985 and March, 1985. The research projectslisted in this compilation are being undertaken mainly withinfederal and provincial departments, and universities. Data onindustrial research was not received. Publications are listedunder the headings: areal mapping, environmental geoscience, geochemistry, geochronology, geological computer applications, geomathematics, geomorphology, geophysics, geotechnique, glaciology, hydrogeology, marine geoscience, mineral/energygeoscience, mineralogy/crystallography, paleontology, petrology, quaternary geology, remote sensing, sedimentology, stratigraphy, structural geology, and volcanology.