Cherts are used to reconstruct the evolution of seawater δ18O and temperature over geological time. However, given influence marine diagenesis, reconstructing from isotope composition cherts is not straightforward, resulting in ambiguity interpretation. Here, we present a detailed petrographic investigation deep-sea drilled 135–40 Ma with focus on effects diagenesis. We combined triple O-isotop...

Porewater dissolved silicic acid (DSi) concentrations and stable Si isotope compositions (δ30Si) together with biogenic silica (bSiO2) contents of sediments in five sediment cores collected from the southern Mariana Trench are presented. These data suggest occurrence bSiO2 dissolution concomitant authigenic clay formation three bSiO2-bearing cores. A reaction-transport model constrained by meas...

[1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. dMo in these fluids range from 0.8 to 3.5% (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within the upper 3 cm of sediment, manga...

A suite of Permian sylvite samples from Boulby potash mine, Yorkshire, UK, consistently yield traces of hydrogen upon analysis by a cold crush technique for liberating volatiles from entrapped fluid inclusions. In contrast, accompanying halite samples do not yield hydrogen. These data suggest the formation of hydrogen by radiolysis of water due to irradiation from potassium in the sylvite. The ...