Rb-Sr age of the Shergotty achondrite and implications for metamorphic resetting of isochron ages

Details Rb-Sr age of the Shergotty achondrite and implications for metamorphic resetting of isochron ages Rb-Sr age of the Shergotty achondrite and implications for metamorphic resetting of isochron ages

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1057n&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 43, July 1979, p. 1057-1074.

Computer Science

25

Achondrites, Aging (Materials), Feldspars, Meteoritic Composition, Rubidium, Strontium, Activation Energy, Microanalysis, Microstructure, Pyroxenes, Shock Heating, Meteorites, Achondrites, Metamorphism, Isochrons, Ages, Energy, Size, Dating Techniques, Rubidium/Strontium, Models, Plagioclase, Parameters, Maskelynite, Comparisons, Diffusion, Transport, Depth, Cooling, Radiometric Dating, Chronology, History, Crystallization, Parent Bodies, Collisions, Shock, Heating, Cosmic Rays, Analysis, Data, Mineralogy,

Scientific paper

The age of the Shergotty achondrite is determined by Rb-Sr isotope analysis and the metamorphic resetting of isochron ages, which is presumed to have occurred during a shock event in the history of the meteorite, is discussed. The isochron best fitting the Rb-Sr evolution diagram is found to correspond to an age of 165 million years, with an initial Sr-87/Sr-86 value of 0.72260. Different apparent ages obtained by the K-Ar and Sm-Nd methods are interpreted in terms of a model which quantifies the degree of resetting of internal isochron ages by low temperature solid state diffusion. On the basis of these considerations, it is concluded that Shergotty crystallized from a melt 650 million years ago, was shock heated to 300 to 400 C after its parent body was involved in a collision 165 million years ago, and was first exposed to cosmic rays two million years ago.

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