[meteorite-list] Comparison of Belize and Australasian Tektites
From: brian burrer <brimane_at_meteoritecentral.com>
Date: Wed, 3 Aug 2011 14:52:53 -0500 Message-ID: <CA+VWDOJKKMp9MXF7LNKo88s0EFwtbCBstkAHsrT9OtCYZFgmfA_at_mail.gmail.com> hmm On Wed, Aug 3, 2011 at 1:57 PM, brian burrer <brimane at gmail.com> wrote: > Hello List, > > The occurence of newly discovered tektites in Belize and their > relationship to Australasian tektites has been pondered by some on > this list. ?While the radiometric ages are similar it is prudent to > look for more similarities to make the case for an association. ?The > information that has been gathered from studying the Belize specimens > indicates no association is likely. > The silica dioxide content is quite low in the Belize samples (62%) > compared to Australasian (73%). ?Silica content does vary somewhat for > any group of tektites but the Belize readings are somewhat below any > known for tektites from any event . > Radiometric dating of the two types shows a gap of forty to fifty > thousand years between events. ?Even accounting for margin of error it > seems unlikely the two events are actually a singular happening. > Another indicator of separate identities comes from the great distance > between the source in Asia and Belize. ?It is more than twice as far > from the gulf of Tonkin (crater location?) to Belize as it is to the > farthest reaches of Australia. ?Tektites ejected over vast distances > such as those that fell in Australia have severe aerodynamic ablation > but this trait is not shared by specimens from Belize. ?The Belize > specimens have shapes more suggestive of proximal or midrange > tektites. > > Happy hunting, > Brian > Received on Wed 03 Aug 2011 03:52:53 PM PDT |
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