Ar ar dating of basalts

01 Nov

It rests on a submarine platform some 50 or 60 m below the ocean’s surface, but 15 to 30 km off the coast, the platform ends and the ocean floor drops to between 18 m.

Easter Island owes its roughly triangular shape to the three volcanoes located at its corners: Poike, Rano Kau, and Terevaka.

This relationship is useful to geochronologists, because quite a few minerals in the Earth’s crust contain measurable quantities of potassium (e.g. In theory, therefore, we can estimate the age of the mineral simply by measuring the relative abundances of each isotope.In addition to these main volcanic centers there are at least 70 subsidiary eruptive centers.The oldest lava flows have been dated at up to 3 million years old, but more recently lower dates of half to three-quarters of a million years have been published.His result was in close agreement with his estimate of the age of the earth.The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction.Other factors and basic assumptions must also be considered.Of course, Kelvin formed his estimates of the age of the Sun without the knowledge of fusion as the true energy source of the Sun.K-Ar dating method sometimes can mislead us, for example Kilauea Iki basalt, Hawaii (A. 1959) dating age are 8.5±6.8 Ma (Krummenacher, 1970).But, in practice, how do we assess the reliability and uncertainty of the published K-Ar age data? Could someone give me some related papers or give me some advice?Though we know that K-Ar dating works and is generally quite accurate, however, the method does have several limitations.First of all, the dating technique assumes that upon cooling, potassium-bearing minerals contain a very tiny amount of argon (an amount equal to that in the atmosphere).