The gradual discovery that late Neoproterozoic ice sheets extended to sea level near the
equator poses a palaeoenvironmental conundrum. Was the Earth's orbital obliquity> …

Over long periods of time (~ Ma), we may consider the oceans, atmosphere and biosphere
as a single exospheric reservoir for CO2. The geological carbon cycle describes the inputs …

The nine editions of Stable Isotope Geochemistry have appeared over a time span of nearly
50 years. The first edition (1973) appeared as a slim book of 135 pages. Due to the rapid …

Negative carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial
deposits in Namibia, combined with estimates of thermal subsidence history, suggest that …

IT is unknown when life first appeared on Earth. The earliest known microfossils (˜ 3,500 Myr
before present) are structurally complex, and if it is assumed that the associated organisms …

The study of noble gases in oceanic basalts is central to understanding chemical
heterogeneity of the Earth's mantle and origin of the atmosphere. In the terrestrial …

We report C, Sr, and O isotopic as well as selected major and trace element data from Late
Proterozoic (ca. 540–900 Ma) marine carbonates in three widely separated basins. The …

An increased ratio of 12C to 13C, an indicator of the principal carbon-fixing reaction of
photosynthesis, is found in sedimentary organic matter dating back to almost four thousand …

The crustal Urey cycle of CO2 involving silicate weathering and metamorphism acts as a
dynamic climate buffer. In this cycle, warmer temperatures speed silicate weathering and …

Convective circulation of seawater through oceanic crust at mid-ocean ridges (MOR) and on
ridge flanks has wide-ranging effects on heat transport, the chemical and isotopic …