Abstract
Glauconite samples from the Navesink Formation of New Jersey were separated into different morphological groups. Each morphological type was dated using the Rb-Sr method in an attempt to test the hypothesis that the mamillary and the lobate glauconite morphologies are more suitable than other morphologies for radiometric dating. Isochron dates of unaltered dark-green lobate glauconites were found to be reliable indicators of the true age of the sedimentary rock. Weathering processes may drastically affect the 87Rb/ 87Sr ratios of glauconite pellets by removal of Rb from the glauconite. This results in anomalously high apparent ages. Light-green glauconites were shown to have suffered extensive Rb loss and are hence inappropriate for dating. A slightly altered dark-green lobate glauconite appears to have suffered some Rb loss. X-ray diffraction criteria were not always sufficient in indicating whether glauconite samples have remained closed systems with respect to 87Rb and 87Sr.
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