C, N, He, and Ar isotope and element ratios in fluid inclusions from MORB chilled glasses: Stepwise crushing data

Isotope studies of fluid inclusions in the mantle rocks and minerals may provide important information on fluid source and fluid-rock interaction, which represent the factors of the formation and transformation of geological objects. As a continuation of our work on studying isotope characteristics of fluid phase of mantle rocks using stepwise crushing, we studied carbon, nitrogen, and argon isotope variations and their element ratios in the fluid inclusions from basaltic glasses, which were taken during cruise 31 of R/V Professor Logachev in the Mid Atlantic ridge rift valley at 20 2230N and were represented by typical depleted basalts of the Mid Atlantic ridge with K2O/TiO2 = .080.10 (N MORB). The high (>1000) carbon to nitrogen ratios in gas-liquid inclusions in MORB glasses could be explained by the influence of elemental fractionation during melt degassing, not by the existence of carbon-rich hypothetical reservoir.