The study shows that the petrographic, geochemical and spectroscopic features in the graphite (the crystalline form of carbon) found in the Saglek-Hebron chemical sedimentary rocks are in fact ...

with the goal of better understanding how chemical sedimentary rocks (e.g., carbonates, chert, iron formations) record chemical, physical, and biological paleoenvironmental conditions. Chemical ...

and lithification (particularly of carbonates and other chemical sedimentary rocks); (ii) analysis of terrestrial paleoenvironmental records to document and constrain the evolution of Earth’s ancient ...

Minerals are chemical compounds which occur naturally ... The basalt which makes up the Giant’s causeway is an igneous rock. Sedimentary rocks are formed by small rock pieces which are ...

Any sedimentary rocks that formed before life appeared on ... about 350 million years after the earliest chemical signs of life. These fossils, discovered in the 1970s in western Australia ...

Right: OH-defects in young (0.3 Gyr) Variscan granites are one order of magnitude higher than in old (0.9-1.8 Gyr) Proterozoic granites from Scandinavia . The OH-content is reflected in recent ...