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June 9th

  • Origins and assessment of snowball Earth hypotheses: Records of Precambrian glaciation onwards from the late nineteenth century led to the concept of one or more major ice ages. This concept was becoming well advanced by the mid 1930s, particularly through the compilation of Kulling in 1934. Even so tillite stratigraphy shows that glaciation was exceptional rather than typical of Earth history.
  • Volcanic shutdown may have led to 'snowball Earth' - environment - 09 May 2009 - New Scientist: A 250-million-ye ar shutdown of volcanic activity which is thought to have occurred early in Earth's history may be what turned the planet into a glacier-covere d snowball. It could also have helped give rise to our oxygen-rich atmosphere.

May 13th

April 17th

  • Late Precambrian Oxygenation; Inception of the Clay Mineral Factory -- Kennedy et al. 311 (5766): 1446 -- Science: An enigmatic stepwise increase in oxygen in the late Precambrian is widely considered a prerequisite for the expansion of animal life. Accumulation of oxygen requires organic matter burial in sediments, which is largely controlled by the sheltering or preservational effects of detrital clay minerals in modern marine continental margin depocenters. Here, we show mineralogical and geochemical evidence for an increase in clay mineral deposition in the Neoproterozoic that immediately predated the first metazoans. Today most clay minerals originate in biologically active soils, so initial expansion of a primitive land biota would greatly enhance production of pedogenic clay minerals (the "clay mineral factory") , leading to increased marine burial of organic carbon via mineral surface preservation.

April 8th

February 5th

December 9th

November 29th

November 21st

September 30th

September 25th

  • Neodymium-142 Evidence for Hadean Mafic Crust -- O'Neil et al. 321 (5897): 1828 -- Science: subscription wall... wishing i hadn't dropped out :@
  • Possible oldest-known rocks found: more detail. they used Nd-Sm. 4.28 Ga
  • World's oldest rocks discovered in Canada - ABC News (Australian Broadcasting Corporation): How can journalists get away with crap like this! "isotope dating can only be used to date rocks older than 4.1 billion years". Makes me wonder how I am supposed to trust anything else from AFP or the ABC. [The statement is utterly wrong, age restrictions depend only on the half-life of the isotopes being used in whatever technique *of* isotope dating is being used. For example, radiocarbon dating can't be used for anything OLDER than a mere 40,000 years, because 14-C and 12-C have short half lives. Radiocarbon is as much a technique of "isotope dating" as any other; you use isotopes to date something! The technique used here (as usual, details are never mentioned) probably involves half lives on a scale of 10 or 15 billion years, and so is restricted to very old stuff (and therefore probably only been used successfully on lunar rocks before - which are mostly very old).]

August 12th

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