EarthRef.org Digital Archive (ERDA) -- Search Results

EarthRef.org Digital Archive (ERDA)
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	Mineral 40Ar/39Ar Age Spectra for a Grenville Diorite
	This diagram combines three 40Ar/39Ar age spectra for hornblende, biotite and K-feldspar minerals separated from one Grenville Diorite in the Haliburton Highlands, Ontario. Although the minerals formed in the same rock, the ages are distinctly different, reflecting different blockin ...
	Data Types: diagram

	Typical Argon Isotope Mass Spectrum for K/Ar Age Dating
	In this schematic spectrum for a typical spiked K/Ar measurement all fractions are shown for the peaks measured at mass 36, 38 and 40. An aliquot of Argon enriched in 38Ar is added to the gas extracted from a geological sample to carry out an isotope dilution experiment. After correcting fo ...
	Data Types: diagram

	Excess Argon in submarine pillow basalts from Hawaii
	Submarine samples of historical age sometimes reveal ages that are much older. For example, lavas that formed pillow basalts less than 10,000 years ago on the northeast ridge of the Kilauea volcano in Hawaii have ages reported up to 43 Myr. As is shown is this diagram, the measured apparen ...
	Data Types: diagram

	Production and Interfering Reactions in 40Ar/39Ar Dating
	The major production reaction in 40Ar/39Ar dating is 39K (n,p) 39Ar as denoted by the red arrow in this diagram. However, at the same time of the neutron bombardment, other interfering reactions take place involving the unwanted production of Argon isotopes from Potassium and Calcium (see th ...
	Data Types: diagram