Age and provenance of the target materials for tektites and possible impactites as inferred from Sm-Nd and Rb-Sr systematics

Details Age and provenance of the target materials for tektites and possible impactites as inferred from Sm-Nd and Rb-Sr systematics Age and provenance of the target materials for tektites and possible impactites as inferred from Sm-Nd and Rb-Sr systematics

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..60..155s&link_type=abstract

Earth and Planetary Science Letters, vol. 60, no. 2, Sept. 1982, p. 155-177.

Computer Science

95

Chronology, Meteoritic Composition, Spherules, Tektites, Australites, Neodymium Isotopes, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes

Scientific paper

Chemical, trace element, and isotopic compositions of tektites are consistent with production by melting of sediments derived from the old terrestrial continental crust. Each tektite group is characterized by a uniform Nd model age, interpreted as the time of formation of the crustal segment which weathered to form the parent sediment for the tektites. Sr model ages are variable within each group, reflecting Rb-Sr fractionation, and, in the favorable limit of very high Rb/Sr ratios, approach the time of sedimentation of the parent material which melted to form the tektites. Unlike tektites, which are dense homogeneous objects, sanidine spherules are porous, fine grained inhomogeneous objects. The leaching experiment employed by the present study shows that the sanidine spherules could have been formed by an oceanic impact involving basaltic crust and overlying sediments or seawater.

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