Peter Deines

TL;DR: In this paper, the chemical and stable isotope compositions of unpolluted ground waters in carbonate terranes are a function of the pH, PCO2, 13C content of the ground water recharge, the 13C contents of the carbonate rock, and the manner in which the rock is dissolved or precipitated.

TL;DR: In this paper, the authors used the data on mantle xenoliths from basalts to support degassing models based on the assumption of limited indigenous carbon isotope variability within the mantle, nor the supposition that all 13 C depleted carbon is of surface origin.

TL;DR: In this paper, a review of the available data on the carbon isotopic composition ranges of carbonatite and kimberlite carbonates shows that they are similar and overlap that of diamonds.

TL;DR: In this paper, three hundred and thirty new 13C analyses of diamonds are presented, indicating, in conjunction with earlier published work, a range of about 30% in the carbon isotopic composition of diamonds.

TL;DR: The lithospheric mantle beneath the Kaapvaal-Zimbabwe craton of southern Africa shows variations in seismic P-wave velocity at depths within the diamond stability field that correlate with differences in the composition of diamonds and their syngenetic inclusions.