Gillespie said he has dated basaltic flow that eruptedyears ago. The importance of recognizing and dating individual glacial periods in the Sierra is that they can then be related to the basalt radiometric dating glaciers that swept much of the United States, putting accurate dates to those events. Gillespie expects his age-dating technique may also have an application in paleoanthropology, the study of fossil remains of early human ancestors, because of the requirement for accurate dating of the young basalts often found near fossilized skeletons.
Gillespie said the dating technique he developed is variation on two established methods: Comparing ratios of radioactive potassium and 40argon, and comparing ratios of two isotopes of argon argon and 39argon.
The reason why radiometric dating of basalt don’t give the exact age of the sea floor because the oceanic crust is denser in nature and at the subduction zone this oceanic crust subducts under the light continental crust where it melts and thus recycling of oceanic crust takes place very frequently and hence it cannot be used for absolute dating of the.
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Deep in the eastern Grand Canyon, Arizona, is a stacked sequence of “ancient” basalt lava flows known by geologists as the Cardenas Basalt. Deep in the eastern Grand Canyon, Arizona, is a stacked sequence of “ancient” basalt lava flows known by geologists as the Cardenas Basalt.