[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: Chicxulub's Antipode (Re: cause of death at KT)

On Sat, 02 Sep 2006 22:12:53 -0700 (PDT) don ohmes <d_ohmes@yahoo.com>
> At risk of getting on thin crust--
> 1). 65 my is old for deep ocean crust. Might be hard to find some 
> that was in the antipodal location at the time. Stuff can move fast, 
> like 10cm/a. That is 6500km since KT, IMMC. Might, in fact, be all 
> subducted.

Regarding the sea floor around India, you might be right.  [I am a
neophyte when it comes to southern Asian tectonics].  But there are
numerous places in today's Pacific Ocean that still contain 65 my old
oceanic crust.

One example is reported in:

Kyte F.T., J.A. Bostwick, and L. Zhou. 1994. The KT boundary of the
Pacific plate, pp. 64-65, in New developments regarding the KT event and
other catastrophes in Earth history, (Abstract). Lunar Planet. Inst.
Cont. No. 825.

Interesting sections, these Pacific DSDP K-T cores.  One core even
contained a stoney meteorite fragment within the K-T boundary bed!  The
odds of such an occurrence are astronomical (pardon the pun).