Re: Response to Why YEC posting

From: Allen Roy (
Date: Wed Aug 22 2001 - 17:15:47 EDT

  • Next message: Allen Roy: "Re: Response to Why YEC posting"

      ----- Original Message -----
      From: Charles Carrigan
      To: Allen Roy ; American Scientific Affiliation
      Sent: Wednesday, August 22, 2001 1:58 PM
      Subject: Re: Response to Why YEC posting

      At 12:01 PM 8/22/01 -0700, you wrote:

        Cases in point.
        1: I know you are aware of the Uinkaret Plateu lava flows which flowed down
        into Grand Canyon. These have been dated by a Pb-Pb isochron age in the
        neighborhood of 2.6 billion years and by a Rb-Sr isochron date somewhere
        around 1.34 billion years. Everyone rejects these computed ages because it
        is obvious that the lava cannot be that old. They must be younger than
        Grand Canyon which is variously dated between 1 and 5 million years. An
        assortment of reasons concerning the "original abundances of isotopes" have
        been proposed to try to explain the discrepancy, but the most important
        point is that the dates are rejected because it is "known" that the lava
        cannot be that old. The rocks are assumed to be young therefore computed
        dates which indicate vast ages are rejected.

        2: Also in Grand Canyon are the Cardenas Basalts which are dated by a Rb-Sr
        isochron near 1.07 billion years. Because the Cardenas Basalts are among the
        oldest exposed rocks in Grand Canyon everyone assumes that the Cardenas
        Basalt's are old enough for the computed dates to be accepted as valid.

      Can you provide references for these dates please?

      Thank You,

      Charles W. Carrigan
      Univ. of Michigan - Department of Geological Sciences
      2534 C.C. Little Bldg.
      425 E. University Ave.
      Ann Arbor, MI 48109-1063

      "People think in five generations -- two ahead, two behind -- with heavy concentration on the one in the middle. Possibly that is tragic, and possibly there is no choice. The human mind may not have evolved enough to be able to comprehend deep time. It may only be able to measure it."
                                                                         - John McPhee, Basin and Range

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