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Age and provenance of the target materials for tektites and possible impactites as inferred from Sm-Nd and Rb-Sr systematicsChemical, 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.
Document ID
19820062711
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shaw, H. F.
(California Inst. of Tech. Pasadena, CA, United States)
Wasserburg, G. J.
(California Institute of Technology Pasadena, CA, United States)
Date Acquired
August 10, 2013
Publication Date
September 1, 1982
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 60
Issue: 2, Se
Subject Category
Lunar And Planetary Exploration
Accession Number
82A46246
Funding Number(s)
CONTRACT_GRANT: NGL-05-002-188
Distribution Limits
Public
Copyright
Other

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