Tracing Earth’s O2 evolution using Zn/Fe ratios in marine carbonates
X.-M. Liu, L.C. Kah, A.H. Knoll, H. Cui, A.J. Kaufman, A. Shahar, R.M. Hazen 2 1603 12 August 2015 1 November 2015 2 December 2015 24 34 0 Next article >>
A cometary origin for martian atmospheric methane
M. Fries, A. Christou, D. Archer, P. Conrad, W. Cooke, J. Eigenbrode, I.L. ten Kate, M. Matney, . Niles, M. Sykes, A. Steele, A. Treiman 2 1602 15 July 2015 1 November 2015 2 December 2015 10 23 0 Next article >> 200 km above the martian surface, well above martian...
Carbon isotope discrimination in C3 land plants is independent of natural variations in pCO2
M.J. Kohn 2 1604 7 July 2015 3 December 2015 8 January 2016 35 43 0 Next article >> 2.5 m/yr) in the geologic record. Figure 3 Figure 4 View all figures and tables Supplementary Figures and Tables Figure S-1 (a) Principles of carbon isotope compositions relevant to...