Latest Pilbara craton Stories
New research from Matthew Jackson and Richard Carlson proposes that the remnants of six of the largest volcanic events of the past 250 million years contain traces of the ancient Earth's primitive mantleâ€”which existed before the largely differentiated mantle of todayâ€”offering clues to the geochemical history of the planet.
Red jasper cored from layers 3.46 billion years old suggests that not only did the oceans contain abundant oxygen then, but that the atmosphere was as oxygen rich as it is today, according to geologists.
By Cook, Robert B Guidebook to the Pegmatites of Western Australia by Mark I. Jacobson, Mark. A. Calderwood, and Benjamin A. Grguric. Hesperian Press, PO Box 317, Victoria Park, WA, Australia 6979 (http:// www.hesperianpress. com). 356 pages; 2007; $85 plus shipping (hardcover).