the latter of which refers to time measured backwards from the present. The Hf-W system provides a powerful complement to the Sm/Nd results for early Earth, because both core formation and silicate differentiation fractionate Hf from W. Calculations ofMoynier et al. (2010), which describe the...
A dual isotopic approach has also demonstrated that nitrate pollution of groundwater in the WRB is derived from fertilizers, livestock manures and wastewater sources due to the high permeability of the karstified zone below the soil (Li et al., 2021a, Zeng et al., 2020, Wang et al., ...
The calculated chemical, mineralogic, and isotopic changes in the rocks are also in accord with observations on altered basalts dredged from mid-ocean ridges (Humphris and Thompson, 1978; Stakes and O'Neil, 1982), as well as with data from ophiolites (Gregory and Taylor, 1981). The model ...
mélange whereas thein-situmodel predicts the magmatism formed by melting of delaminated continental crust/lithosphere in response to the Indo–Asia collision1,2,3. The CQMB thus is essential to elucidate the crustal structure of the northern Tibetan Plateau, the tectonic framework and evolution of t...
Chemical and isotopic changes accompanying seawater-basalt interaction in axial mid-ocean ridge hydrothermal systems are modeled with the aid of chemical equilibria and mass transfer computer programs, incorporating provision for addition and subtraction of a wide-range of reactant and product minerals, ...
(Supplementary Fig.9), so as to distinguish the products of each substrate when mixtures of the labeled compound with unlabeled GPP were used. We added precursors to extracts of yeast cells expressingClLimS and determined the isotopic composition of the produced limonene using GC–APCI–QqToF ...
The fragmentation behaviour of the ion MeP(O)OMe+ has been investigated using quantum mechanical calculations at the B3LYP and MP2 levels to support experiments made with an Ion Trap Mass Spectrometer. Two mechanisms for the loss of CH2O are found, one involving a 1,3-H migration to phosphoru...
As with the carbon analogue, the quartic and sextic distortion constants are found in the SM along with the Si(O)OSi isotopic data. 3.4. c-Si22O22 Compared to the c-C22O22 results, 𝐷2ℎD2h c-Si22O22 has two intensities larger than that corresponding to water’s 70 km mol−1...
ELIPs always carry a distinct Nd signature compared to the average continental crust and thus might have left a distinct imprint on the seawater record [3]. Additionally, the Sm-Nd isotopic system is resistant to diagenesis and metamorphism during post-deposition [26,27]. Therefore, Nd isotopic...
Algorithm for preliminary short-cut calculations for the heavy water distillation column. Calculation/Specification Select feed flow rate, feed isotopic purity, top and bottom product isotopic purity (IP) desired Select feed temperature, feed quality, condenser pressure Calculate dew point of distillate ...