The timing and nature of changes in the chemistry of the early oceans are intensely debated. Geochemical analyses show that a prominent transition to sulphidic marine conditions 1.8 billion years ago may have been restricted to near-shore environments.
机构:
Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA
Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USACardiff Univ, Sch Earth & Environm Sci, Cardiff CF10 3AT, Wales