Catalog
Global Climate Change: Convergence of Disciplines
Arnold J. Bloom
Web Topic 2.1 Extraterrestrial Evidence of Snowball Earth
Iridium (Ir) abundance in relation to other elements at various depths of drill cores, taken from Kipushi, Congo. The Diamictite Petit Conglomerat is glacial till and the Limestone Calcaire Rose is a carbonate cap. Iridium (Ir), one of the rarest chemical elements in Earth’s crust, is relatively prevalent in some rock layers formed during the Cryogenian that are surrounded by rock layers indicating the beginning and ending of a very cold period.
(Bodiselitsch, B., C. Koeberl, S. Master, and W. U. Reimold (2005) Estimating duration and intensity of Neoproterozoic snowball glaciations from Ir anomalies. Science 308:239–242. http://www.sciencemag.org/cgi/content/abstract/sci;308/5719/239)
Home ||
Contact Us ||
Orders/Returns ||
List by Author
List by Subject Area ||
List by Title ||
View Exam Copies Requested